1. A system for bioethanol production from lignocellulosic biomass, comprising: a. a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components; b. a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars; c. a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using co-culture of microbial strains; d. a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth; e. a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration; f. a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production.

2. The system of claim 1, wherein said pretreatment unit utilizes an acid pretreatment process to remove said lignin and hemicellulose components from said lignocellulosic biomass.

3. The system of claim 1, wherein said hydrolysis unit comprises a cellulase enzyme complex for the enzymatic conversion of said cellulose into said fermentable sugars.

4. The system of claim 1, wherein said fermentation unit utilizes Saccharomyces cerevisiae and an isolated pentose sugar fermenting yeast as said microbial consortium for the fermentation of said fermentable sugars into said ethanol.

5. The system of claim 1, wherein said separation unit comprises a centrifuge for the initial separation of said ethanol from said fermentation broth.

6. The system of claim 1, wherein said distillation unit comprises a fractional distillation column for the purification of said ethanol to at least 99.5% by volume.

7. The system of claim 1, wherein said monitoring and control system includes sensors for detecting temperature, pH, and ethanol concentration within said fermentation unit.

8. The system of claim 1, further comprising a waste management unit operatively connected to said separation unit, wherein said waste management unit is configured to treat and dispose of residual biomass and other waste products generated during said bioethanol production process.

9. The system of claim 1, wherein said lignocellulosic biomass comprises agricultural residues selected from the group consisting of corn stover, wheat straw, rice straw, and sugarcane bagasse.

10. A method for producing bioethanol from lignocellulosic biomass, comprising the steps of: a. pretreating said lignocellulosic biomass in a pretreatment unit to remove lignin and hemicellulose components, thereby obtaining a pretreated biomass; b. enzymatically hydrolyzing said pretreated biomass in a hydrolysis unit to convert cellulose into fermentable sugars; c. fermenting said fermentable sugars in a fermentation unit using co-culture of microbial consortium to produce ethanol; d. separating said ethanol from a fermentation broth in a separation unit; e. purifying said ethanol to a desired concentration in a distillation unit; f. monitoring and controlling said pretreatment, hydrolysis, fermentation, separation, and distillation units using a monitoring and control system to optimize the bioethanol production process. SYSTEM FOR BIOETHANOL PRODUCTION FROM LIGNOCELLULOSIC BIOMASS Abstract The present disclosure provides a system for bioethanol production from lignocellulosic biomass, comprising a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components; a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars; a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using co-culture of microbial consortium; a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth; a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration; a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production. Fig. 1 , Claims:Claims :

1. A system for bioethanol production from lignocellulosic biomass, comprising: a. a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components; b. a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars; c. a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using co-culture of microbial strains; d. a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth; e. a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration; f. a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production.

2. The system of claim 1, wherein said pretreatment unit utilizes an acid pretreatment process to remove said lignin and hemicellulose components from said lignocellulosic biomass.

3. The system of claim 1, wherein said hydrolysis unit comprises a cellulase enzyme complex for the enzymatic conversion of said cellulose into said fermentable sugars.

4. The system of claim 1, wherein said fermentation unit utilizes Saccharomyces cerevisiae and an isolated pentose sugar fermenting yeast as said microbial consortium for the fermentation of said fermentable sugars into said ethanol.

5. The system of claim 1, wherein said separation unit comprises a centrifuge for the initial separation of said ethanol from said fermentation broth.

6. The system of claim 1, wherein said distillation unit comprises a fractional distillation column for the purification of said ethanol to at least 99.5% by volume.

7. The system of claim 1, wherein said monitoring and control system includes sensors for detecting temperature, pH, and ethanol concentration within said fermentation unit.

8. The system of claim 1, further comprising a waste management unit operatively connected to said separation unit, wherein said waste management unit is configured to treat and dispose of residual biomass and other waste products generated during said bioethanol production process.

9. The system of claim 1, wherein said lignocellulosic biomass comprises agricultural residues selected from the group consisting of corn stover, wheat straw, rice straw, and sugarcane bagasse.

10. A method for producing bioethanol from lignocellulosic biomass, comprising the steps of: a. pretreating said lignocellulosic biomass in a pretreatment unit to remove lignin and hemicellulose components, thereby obtaining a pretreated biomass; b. enzymatically hydrolyzing said pretreated biomass in a hydrolysis unit to convert cellulose into fermentable sugars; c. fermenting said fermentable sugars in a fermentation unit using co-culture of microbial consortium to produce ethanol; d. separating said ethanol from a fermentation broth in a separation unit; e. purifying said ethanol to a desired concentration in a distillation unit; f. monitoring and controlling said pretreatment, hydrolysis, fermentation, separation, and distillation units using a monitoring and control system to optimize the bioethanol production process.

Description:SYSTEM FOR BIOETHANOL PRODUCTION FROM LIGNOCELLULOSIC BIOMASS
Field of the Invention
[0001] The present disclosure generally relates to biofuel production systems and particularly to a system for bioethanol production from lignocellulosic biomass.
Background
[0002] The background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Bioethanol production from lignocellulosic biomass has garnered significant attention due to the increasing demand for sustainable energy sources. The process involves converting complex carbohydrates in lignocellulosic biomass into ethanol, which can be used as a renewable fuel. Bioethanol production systems typically include several stages such as pretreatment, hydrolysis, fermentation, separation, and distillation.
[0004] Various pretreatment methods are known to be employed in bioethanol production systems. One such method involves the use of acid pretreatment, where lignocellulosic biomass is treated with acid to remove lignin and hemicellulose components, resulting in a pretreated biomass. Such a method, although effective in breaking down biomass components, poses challenges related to the handling of corrosive chemicals and the generation of inhibitory compounds that affect downstream processes. The removal of these inhibitors necessitates additional processing steps, thereby increasing the complexity and cost of the bioethanol production system.
[0005] Another well-known pretreatment method utilizes steam explosion. In this method, lignocellulosic biomass is subjected to high-pressure steam followed by a rapid decompression, which disrupts the cell structure and makes the cellulose more accessible to enzymatic hydrolysis. However, the steam explosion method is associated with significant energy consumption and requires specialized equipment to handle high pressures and temperatures. Additionally, the method may result in the partial degradation of hemicellulose and the formation of inhibitory compounds, which affect the efficiency of subsequent hydrolysis and fermentation processes.
[0006] Hydrolysis of pretreated biomass is commonly achieved through enzymatic hydrolysis using cellulase enzymes. This process converts cellulose in the pretreated biomass into fermentable sugars such as glucose. Enzymatic hydrolysis is favoured due to the specificity and mild operating conditions of cellulase enzymes. However, the cost of enzymes and the requirement for prolonged reaction times pose significant challenges. Furthermore, the presence of residual lignin and other inhibitors from the pretreatment process can negatively impact enzyme activity, leading to suboptimal conversion rates.
[0007] Fermentation of fermentable sugars into ethanol is typically performed using microbial strains such as Saccharomyces cerevisiae. The fermentation process converts glucose and other fermentable sugars into ethanol and carbon dioxide. Saccharomyces cerevisiae is widely used due to its robustness and high ethanol yield. Nevertheless, the efficiency of the fermentation process can be hindered by the presence of inhibitory compounds generated during the pretreatment and hydrolysis stages. These inhibitors can inhibit microbial growth and fermentation activity, resulting in lower ethanol yields and longer fermentation times.
[0008] Separation of ethanol from the fermentation broth is often achieved using centrifugation or filtration techniques. Such techniques enable the removal of solid residues and cell biomass from the liquid fermentation broth. However, separation processes are associated with high energy consumption and require the handling of large volumes of fermentation broth, which can be resource-intensive and costly.
[0009] Distillation is the final step in bioethanol production, where ethanol is purified to the desired concentration. Fractional distillation columns are commonly used to separate ethanol from water and other impurities based on differences in boiling points. While distillation is effective in achieving high-purity ethanol, the process is energy-intensive and requires careful control of operating conditions to prevent ethanol losses and ensure product quality.
[00010] Monitoring and control systems are integral to bioethanol production systems. Such systems utilize sensors to monitor key parameters such as temperature, pH, and ethanol concentration in various units of the production process. Real-time data from sensors enable the regulation and optimization of the process, ensuring efficient and consistent bioethanol production. However, the integration and maintenance of monitoring and control systems add to the complexity and cost of the overall production system.
[00011] In light of the above discussion, there exists an urgent need for solutions that overcome the problems associated with conventional systems and/or techniques for bioethanol production from lignocellulosic biomass.

Summary
[00012] The following presents a simplified summary of various aspects of this disclosure in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements nor delineate the scope of such aspects. Its purpose is to present some concepts of this disclosure in a simplified form as a prelude to the more detailed description that is presented later.
[00013] The following paragraphs provide additional support for the claims of the subject application.
[00014] In an aspect, the present disclosure provides a system for bioethanol production from lignocellulosic biomass, comprising a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components; a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars; a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using a microbial strain; a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth; a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration; a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production.
[00015] In an embodiment, said pretreatment unit utilizes an acid pretreatment process to remove said lignin and hemicellulose components from said lignocellulosic biomass. The acid pretreatment process enhances the efficiency of subsequent hydrolysis by breaking down the complex structure of lignocellulosic biomass, making cellulose more accessible to enzymatic action. The utilization of acid pretreatment facilitates the reduction of lignin content, which is crucial for improving the yield of fermentable sugars during the hydrolysis stage.
[00016] In an embodiment, said hydrolysis unit comprises a cellulase enzyme complex for the enzymatic conversion of said cellulose into said fermentable sugars. The cellulase enzyme complex is selected for its efficiency in breaking down cellulose into glucose and other fermentable sugars. The enzymatic hydrolysis process operates under controlled conditions to maximize the conversion rate and minimize the formation of inhibitory by-products. The hydrolysis unit is designed to maintain optimal temperature and pH levels to support enzyme activity and stability.
[00017] In an embodiment, said fermentation unit utilizes Saccharomyces cerevisiae along with an isolated pentose sugar fermenting yeast as said microbial consortium for the fermentation of said fermentable sugars into said ethanol. Saccharomyces cerevisiae is chosen for its robustness and high ethanol yield. The fermentation unit is equipped with mechanisms to maintain anaerobic conditions and optimal temperature for microbial activity. The fermentation process is monitored to ensure efficient conversion of sugars to ethanol, with minimal production of unwanted by-products.
[00018] In an embodiment, said separation unit comprises a centrifuge for the initial separation of said ethanol from said fermentation broth. The centrifuge is used to remove solid residues, including microbial biomass, from the liquid phase. This initial separation step is critical for improving the efficiency of the subsequent distillation process. The centrifuge operates at high speeds to ensure rapid and effective separation, reducing the load on the distillation unit.
[00019] In an embodiment, said distillation unit comprises a fractional distillation column for the purification of said ethanol to at least 99.5% by volume. The fractional distillation column is designed to separate ethanol from water and other impurities based on differences in boiling points. The distillation unit operates under controlled pressure and temperature conditions to achieve high-purity ethanol. The design of the distillation column ensures minimal ethanol losses and efficient energy utilization.
[00020] In an embodiment, said monitoring and control system includes sensors for detecting temperature, pH, and ethanol concentration within said fermentation unit. The monitoring and control system collects real-time data from various units of the bioethanol production system. This data is used to regulate process parameters and optimize the overall efficiency of the system. The control system can adjust conditions in the pretreatment, hydrolysis, fermentation, separation, and distillation units to maintain optimal performance.
[00021] In an embodiment, said system further comprises a waste management unit operatively connected to said separation unit, wherein said waste management unit is configured to treat and dispose of residual biomass and other waste products generated during said bioethanol production process. The waste management unit includes processes for the safe disposal of solid and liquid waste, ensuring compliance with environmental regulations. This unit also recovers valuable by-products, if any, for potential use in other applications.
[00022] In an embodiment, said lignocellulosic biomass comprises agricultural residues selected from the group consisting of corn stover, wheat straw, rice straw, and sugarcane bagasse. The selection of agricultural residues as feedstock leverages the availability of these materials as a cost-effective and sustainable source for bioethanol production. The system is designed to handle various types of lignocellulosic biomass, accommodating differences in composition and processing requirements.
[00023] In an aspect, the present disclosure also provides a method for producing bioethanol from lignocellulosic biomass, comprising the steps of: pretreating said lignocellulosic biomass in a pretreatment unit to remove lignin and hemicellulose components, thereby obtaining a pretreated biomass; enzymatically hydrolyzing said pretreated biomass in a hydrolysis unit to convert cellulose into fermentable sugars; fermenting said fermentable sugars in a fermentation unit using co-culture of microbial consortium to produce ethanol; separating said ethanol from a fermentation broth in a separation unit; purifying said ethanol to a desired concentration in a distillation unit; monitoring and controlling said pretreatment, hydrolysis, fermentation, separation, and distillation units using a monitoring and control system to optimize the bioethanol production process.
[00024] In an embodiment, the pretreating step involves the use of an acid pretreatment process to effectively remove lignin and hemicellulose components from said lignocellulosic biomass. This step is critical for enhancing the accessibility of cellulose to enzymatic hydrolysis, thereby improving the overall efficiency of the bioethanol production process.
[00025] In an embodiment, the enzymatic hydrolyzing step employs a cellulase enzyme complex to convert said pretreated biomass into fermentable sugars. The enzyme complex is specifically formulated to target cellulose, breaking it down into glucose and other simple sugars suitable for fermentation. This step is carried out under conditions that maximize enzyme activity and yield.
[00026] In an embodiment, the fermenting step utilizes Saccharomyces cerevisiae along with an isolated pentose sugar fermenting yeast to convert said fermentable sugars into ethanol. This microbial strain is selected for its high efficiency in ethanol production and its ability to thrive in the conditions present during the fermentation process. The fermentation is carefully monitored and maintained at optimal conditions to ensure maximum ethanol yield.
[00027] In an embodiment, the separating step employs a centrifuge to remove solid residues from said fermentation broth, thereby isolating said ethanol. The use of a centrifuge allows for the efficient separation of ethanol from microbial biomass and other solids, preparing the liquid phase for subsequent purification.
[00028] In an embodiment, the purifying step involves the use of a fractional distillation column to achieve the desired ethanol concentration. The distillation process separates ethanol from water and other impurities based on their boiling points, resulting in high-purity ethanol suitable for various applications.
[00029] In an embodiment, the monitoring and controlling step involves the use of sensors to track key parameters such as temperature, pH, and ethanol concentration throughout the bioethanol production process. The data collected by these sensors is used to regulate and optimize the performance of the pretreatment, hydrolysis, fermentation, separation, and distillation units, ensuring efficient and consistent production of bioethanol.
[00030] In an embodiment, the method includes an additional step of treating and disposing of residual biomass and other waste products through a waste management unit. This unit ensures that waste generated during the bioethanol production process is handled in an environmentally responsible manner, with potential recovery of valuable by-products for further use.
Brief Description of the Drawings
[00031] The features and advantages of the present disclosure would be more clearly understood from the following description taken in conjunction with the accompanying drawings in which:
[00032] FIG. 1 illustrates an integrated process for bioethanol production from lignocellulosic biomass, in accordance with the embodiments of the present disclosure.
[00033] FIG. 2 illustrates a method for producing bioethanol from lignocellulosic biomass, in accordance with the embodiments of the present disclosure.
Detailed Description
[00034] In the following detailed description of the invention, reference is made to the accompanying drawings that form a part hereof, and in which is shown, by way of illustration, specific embodiments in which the invention may be practiced. In the drawings, like numerals describe substantially similar components throughout the several views. These embodiments are described in sufficient detail to claim those skilled in the art to practice the invention. Other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims and equivalents thereof.
[00035] The use of the terms “a” and “an” and “the” and “at least one” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The use of the term “at least one” followed by a list of one or more items (for example, “at least one of A and B”) is to be construed to mean one item selected from the listed items (A or B) or any combination of two or more of the listed items (A and B), unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
[00036] Pursuant to the "Detailed Description" section herein, whenever an element is explicitly associated with a specific numeral for the first time, such association shall be deemed consistent and applicable throughout the entirety of the "Detailed Description" section, unless otherwise expressly stated or contradicted by the context.
[00037] FIG. 1 illustrates a system for bioethanol production from lignocellulosic biomass, in accordance with the embodiments of the present disclosure. The system for bioethanol production from lignocellulosic biomass comprises a pretreatment unit, a hydrolysis unit, a fermentation unit, a separation unit, a distillation unit, and a monitoring and control system. The pretreatment unit processes lignocellulosic biomass by removing lignin and hemicellulose components, thereby converting the biomass into pretreated biomass. Such a process involves the application of chemical, mechanical, or thermal treatments to facilitate the removal of the lignin and hemicellulose components from the lignocellulosic biomass. The removal of these components is necessary to increase the accessibility of the cellulose for the subsequent hydrolysis process. The pretreatment unit may employ various methods such as acid hydrolysis, alkaline hydrolysis, steam explosion, or ammonia fibre expansion, each of which enhances the breakdown of the biomass structure. The pretreatment unit's role is to ensure that the biomass is sufficiently processed to allow for effective enzymatic hydrolysis. The effectiveness of the pretreatment process directly impacts the efficiency of the entire bioethanol production system by determining the extent of lignin and hemicellulose removal. Such pretreatment enables the subsequent hydrolysis unit to function optimally by providing a more accessible substrate for enzyme action.
[00038] The hydrolysis unit is operatively connected to the pretreatment unit and enzymatically converts cellulose in the pretreated biomass into fermentable sugars. This conversion is achieved through the action of cellulase enzymes, which break down the cellulose into glucose and other simple sugars. The hydrolysis unit typically includes a bioreactor where the pretreated biomass is mixed with a solution containing cellulase enzymes. The conditions within the hydrolysis unit, such as temperature, pH, and enzyme concentration, are optimized to maximize the conversion rate of cellulose to fermentable sugars. The hydrolysis unit operates under conditions that favor the activity of the cellulase enzymes, which may involve maintaining a specific temperature range, typically between 45°C to 50°C, and a pH range of 4.8 to 5.5. The efficiency of the hydrolysis process is critical for the overall yield of fermentable sugars, which in turn influences the ethanol production yield in the subsequent fermentation process. The hydrolysis unit's design and operational parameters are crucial for ensuring that the cellulose is

effectively converted, thereby providing a high concentration of fermentable sugars for fermentation.
[00039] The fermentation unit is operatively connected to the hydrolysis unit and ferments the fermentable sugars into ethanol using a microbial strain. This unit involves the use of microorganisms such as yeast or bacteria that can convert the fermentable sugars into ethanol and carbon dioxide through the process of fermentation. The fermentation unit typically comprises a fermenter where the enzymatic hydrolysate containing fermentable sugars is inoculated with the microbial strain. The conditions within the fermentation unit, such as temperature, pH, and nutrient availability, are controlled to optimize the growth and metabolic activity of the microorganisms. The fermentation process may occur under anaerobic conditions to favor ethanol production. The efficiency of the fermentation unit is determined by factors such as the concentration of fermentable sugars, the type and viability of the microbial strain, and the fermentation conditions. The unit's design may include features such as agitation and temperature control systems to maintain optimal conditions for microbial activity. The fermentation unit enables the conversion of sugars to ethanol, which is the primary product of the bioethanol production system.
[00040] The separation unit is operatively connected to the fermentation unit and separates ethanol from the fermentation broth. This unit typically employs methods such as centrifugation, filtration, or decantation to separate the ethanol from the microbial biomass and other solid residues present in the fermentation broth. The separation unit's purpose is to obtain a crude ethanol mixture that can be further purified in the subsequent distillation unit. The separation process is critical to ensure that the ethanol is efficiently recovered from the fermentation broth with minimal loss. The design and operation of the separation unit are tailored to achieve high recovery rates of ethanol while removing as many impurities as possible. The separation unit may include equipment such as centrifuges, membrane filters, or sedimentation tanks, depending on the specific separation technique employed. The effectiveness of the separation unit influences the purity of the ethanol entering the distillation unit, thereby impacting the overall efficiency of the bioethanol production process.
[00041] The distillation unit is operatively connected to the separation unit and purifies the ethanol to a desired concentration. This unit typically involves distillation columns where the crude ethanol mixture is subjected to heat, causing the ethanol to vaporize and subsequently condense at a higher purity level. The distillation unit operates on the principle of differential boiling points, where ethanol, having a lower boiling point than water and other impurities, is separated based on its volatility. The unit may consist of one or more distillation columns arranged in series or parallel, depending on the desired purity and production capacity. The distillation unit is designed to achieve ethanol concentrations suitable for commercial use, typically around 95% to 99% by volume. The unit's design considerations include factors such as column height, reflux ratio, and energy consumption, which are optimized to maximize the purity and yield of ethanol. The distillation unit ensures that the ethanol produced meets industry standards for use as a biofuel or chemical feedstock.
[00042] The monitoring and control system is operatively connected to the pretreatment unit, the hydrolysis unit, the fermentation unit, the separation unit, and the distillation unit. This system regulates and optimizes the operation of the entire bioethanol production system. The monitoring and control system typically includes sensors, controllers, and software that monitor key process parameters such as temperature, pH, pressure, and flow rates. The system collects real-time data from each unit, processes this data, and makes adjustments to optimize the performance and efficiency of the bioethanol production process. The monitoring and control system may include feedback loops that automatically adjust operating conditions in response to deviations from setpoints, thereby maintaining optimal conditions for each process stage. The system also enables operators to oversee the entire production process from a central control room, enhancing the ability to manage and troubleshoot the bioethanol production system. The integration of the monitoring and control system ensures that the process operates smoothly, reduces downtime, and increases the overall efficiency and yield of bioethanol production.
[00043] In an embodiment, the pretreatment unit utilizes an acid pretreatment process to remove lignin and hemicellulose components from lignocellulosic biomass. The acid pretreatment process involves the application of a dilute or concentrated acid solution to the lignocellulosic biomass, resulting in the hydrolysis of hemicellulose and partial solubilization of lignin. Such a process increases the accessibility of cellulose by breaking down the rigid structure of lignocellulosic biomass. The acid pretreatment process typically includes steps such as acid impregnation, heating, and neutralization. The acid used in the process can be sulfuric acid, hydrochloric acid, or any other suitable acid known in the field. The pretreatment conditions, such as temperature, acid concentration, and residence time, are optimized to maximize the removal of lignin and hemicellulose while minimizing the degradation of cellulose. The acid pretreatment process also produces various by-products, including furfural and acetic acid, which are removed in subsequent processing steps. The pretreatment unit thereby enhances the efficiency of subsequent hydrolysis and fermentation steps by improving the enzymatic digestibility of the cellulose component. The technical effect of the acid pretreatment process includes increased yield of fermentable sugars from the lignocellulosic biomass and improved overall efficiency of the bioethanol production process.
[00044] In an embodiment, the hydrolysis unit comprises a cellulase enzyme complex for the enzymatic conversion of cellulose into fermentable sugars. The cellulase enzyme complex includes various enzymes such as endoglucanases, exoglucanases, and ß-glucosidases, which work synergistically to break down cellulose into glucose. Endoglucanases randomly cleave internal bonds within the cellulose chain, creating new chain ends. Exoglucanases further hydrolyze the chain ends to produce cellobiose, which is subsequently hydrolyzed to glucose by ß-glucosidases. The enzymatic hydrolysis process is conducted under controlled conditions of temperature, pH, and enzyme concentration to achieve optimal conversion efficiency. The hydrolysis unit may include a reactor vessel equipped with agitation and temperature control systems to maintain the desired reaction conditions. The enzymatic conversion of cellulose to fermentable sugars is a critical step in the bioethanol production process, as it determines the availability of fermentable substrates for the fermentation unit. The technical effect of using a cellulase enzyme complex includes high yield and purity of glucose, reduced processing time, and lower energy consumption compared to chemical hydrolysis methods. The hydrolysis unit thereby contributes to the overall efficiency and sustainability of the bioethanol production process.
[00045] In an embodiment, the fermentation unit utilizes Saccharomyces cerevisiae along with an isolated pentose sugar fermenting yeast as the microbial consortium for the fermentation of fermentable sugars into ethanol. Saccharomyces cerevisiae, commonly known as baker’s yeast, is widely used in industrial fermentation processes due to its high ethanol productivity, tolerance to various fermentation inhibitors, and ability to grow under anaerobic conditions. The fermentation process involves the conversion of glucose and other fermentable sugars into ethanol and carbon dioxide through glycolysis and subsequent ethanol fermentation pathways. The fermentation unit includes bioreactors designed to provide optimal conditions for yeast growth and ethanol production, such as temperature control, pH regulation, and agitation. The fermentation unit may also include nutrient supplementation and oxygen sparging systems to support yeast metabolism. The use of Saccharomyces cerevisiae in the fermentation unit ensures high ethanol yield and productivity, as well as robustness against process variations. The technical effect of utilizing Saccharomyces cerevisiae includes efficient conversion of fermentable sugars to ethanol, reduced risk of contamination, and ease of process control. The fermentation unit thereby plays a crucial role in the bioethanol production process by converting the sugars obtained from the hydrolysis unit into the desired ethanol product.
[00046] In an embodiment, the separation unit comprises a centrifuge for the initial separation of ethanol from the fermentation broth. The centrifuge operates based on the principle of centrifugal force, which separates components of the fermentation broth based on their density differences. The fermentation broth, containing ethanol, yeast cells, and other suspended solids, is fed into the centrifuge. The high rotational speed of the centrifuge generates centrifugal force, causing the denser components, such as yeast cells and solids, to move outward to the perimeter of the centrifuge bowl, while the lighter component, ethanol, remains in the center. The separated ethanol is collected through a discharge port, while the solid residues are removed through another outlet. The centrifuge allows for continuous and efficient separation of ethanol from the fermentation broth, reducing the load on subsequent purification steps. The technical effect of using a centrifuge in the separation unit includes high separation efficiency, reduced processing time, and improved clarity of the ethanol product. The separation unit thereby enhances the overall efficiency of the bioethanol production process by effectively removing solids and concentrating the ethanol stream.
[00047] In an embodiment, the distillation unit comprises a fractional distillation column for the purification of ethanol to at least 99.5% by volume. The fractional distillation column operates on the principle of repeated vaporization and condensation to separate components based on their boiling points. The ethanol mixture is heated in a reboiler, causing the ethanol to vaporize and rise through the column. The column contains a series of trays or packing materials that provide surface area for the vapor to condense and re-vaporize, creating a concentration gradient. As the vapor ascends the column, the ethanol concentration increases, while impurities with higher boiling points are left behind. The purified ethanol is collected at the top of the column as distillate, while the remaining impurities are removed from the bottom as bottoms. The fractional distillation column ensures high-purity ethanol suitable for fuel and industrial applications. The technical effect of using a fractional distillation column in the distillation unit includes high separation efficiency, consistent product quality, and compliance with purity standards. The distillation unit thereby ensures the production of high-purity ethanol, enhancing the overall value and applicability of the bioethanol product.
[00048] In an embodiment, the monitoring and control system includes sensors for detecting temperature, pH, and ethanol concentration within the fermentation unit. The sensors provide real-time data on critical process parameters, enabling precise control and optimization of the fermentation process. Temperature sensors monitor the fermentation temperature, ensuring that it remains within the optimal range for yeast activity. pH sensors measure the acidity of the fermentation broth, allowing for adjustments to maintain the desired pH level. Ethanol concentration sensors detect the concentration of ethanol in the broth, providing information on the progress of fermentation and the need for downstream processing. The monitoring and control system may include a central control unit that processes sensor data and implements control actions based on predefined algorithms. The system enables automated adjustments to process conditions, reducing the risk of deviations and enhancing process stability. The technical effect of incorporating a monitoring and control system includes improved process efficiency, consistent product quality, and reduced operational costs. The monitoring and control system thereby ensures optimal performance of the fermentation unit and contributes to the overall reliability of the bioethanol production process.
[00049] In an embodiment, the system further comprises a waste management unit operatively connected to the separation unit, wherein the waste management unit treats and disposes of residual biomass and other waste products generated during the bioethanol production process. The waste management unit includes equipment and processes for the treatment of solid and liquid waste streams to minimize environmental impact and comply with regulatory standards. Residual biomass from the separation unit is processed through methods such as anaerobic digestion, composting, or incineration to reduce volume and recover energy. Liquid waste streams, including process water and effluents, undergo treatments such as filtration, sedimentation, biological treatment, and chemical neutralization to remove contaminants and enable safe disposal or reuse. The waste management unit ensures the responsible handling of waste products, reducing the environmental footprint of the bioethanol production process. The technical effect of incorporating a waste management unit includes enhanced sustainability, compliance with environmental regulations, and efficient resource utilization. The waste management unit thereby supports the overall environmental and economic viability of the bioethanol production system.
[00050] In an embodiment, the lignocellulosic biomass comprises agricultural residues selected from the group consisting of corn stover, wheat straw, rice straw, and sugarcane bagasse. Agricultural residues are the non-food parts of crops that are typically discarded after harvest. These residues are rich in cellulose, hemicellulose, and lignin, making them suitable feedstocks for bioethanol production. Corn stover includes the stalks, leaves, and cobs left after harvesting corn. Wheat straw consists of the stems and leaves remaining after wheat grains are harvested. Rice straw includes the stalks and leaves left after harvesting rice. Sugarcane bagasse is the fibrous residue remaining after extracting juice from sugarcane. The use of agricultural residues as lignocellulosic biomass feedstock provides a renewable and abundant source of raw materials for bioethanol production, reducing dependence on fossil fuels and promoting agricultural waste utilization. The technical effect of using agricultural residues includes reduced feedstock costs, enhanced sustainability, and contribution to waste management. The lignocellulosic biomass thereby supports the economic and environmental benefits of the bioethanol production process by utilizing readily available and otherwise discarded agricultural by-products.
[00051] FIG. 2 illustrates a method 200 for producing bioethanol from lignocellulosic biomass, in accordance with the embodiments of the present disclosure. At step 202, the method includes pretreating lignocellulosic biomass in a pretreatment unit to remove lignin and hemicellulose components, thereby obtaining pretreated biomass. The pretreatment process involves the use of acid to hydrolyze hemicellulose and solubilize lignin, enhancing the accessibility of cellulose. At step 204, the method includes enzymatically hydrolyzing the pretreated biomass in a hydrolysis unit to convert cellulose into fermentable sugars. This process uses a cellulase enzyme complex, which includes endoglucanases, exoglucanases, and ß-glucosidases, to break down cellulose into glucose molecules. At step 206, the method includes fermenting the fermentable sugars in a fermentation unit using co-culture of microbial strains to produce ethanol. Saccharomyces cerevisiae, a type of yeast, is employed to convert glucose and other sugars into ethanol and carbon dioxide under anaerobic conditions. At step 208, the method includes separating the ethanol from the fermentation broth in a separation unit. The separation unit utilizes a centrifuge to effectively remove yeast cells and other solids from the ethanol-containing broth, resulting in a clarified ethanol solution. At step 210, the method includes purifying the ethanol to a desired concentration in a distillation unit. A fractional distillation column is used to achieve a high purity of ethanol, typically at least 99.5% by volume, by separating it from impurities based on boiling point differences. At step 212, the method includes monitoring and controlling the pretreatment, hydrolysis, fermentation, separation, and distillation units using a monitoring and control system to optimize the bioethanol production process. The system uses sensors to detect parameters such as temperature, pH, and ethanol concentration, ensuring optimal conditions are maintained throughout the process.
[00052] Example embodiments herein have been described above with reference to block diagrams and flowchart illustrations of methods and apparatuses. It will be understood that each block of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations, respectively, can be implemented by various means including hardware, software, firmware, and a combination thereof. For example, in one embodiment, each block of the block diagrams and flowchart illustrations, and combinations of blocks in the block diagrams and flowchart illustrations can be implemented by computer program instructions. These computer program instructions may be loaded onto a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions which execute on the computer or other programmable data processing apparatus create means for implementing the functions specified in the flowchart block or blocks.
[00053] Throughout the present disclosure, the term ‘processing means’ or ‘microprocessor’ or ‘processor’ or ‘processors’ includes, but is not limited to, a general purpose processor (such as, for example, a complex instruction set computing (CISC) microprocessor, a reduced instruction set computing (RISC) microprocessor, a very long instruction word (VLIW) microprocessor, a microprocessor implementing other types of instruction sets, or a microprocessor implementing a combination of types of instruction sets) or a specialized processor (such as, for example, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a digital signal processor (DSP), or a network processor).
[00054] The term “non-transitory storage device” or “storage” or “memory,” as used herein relates to a random access memory, read only memory and variants thereof, in which a computer can store data or software for any duration.
[00055] Operations in accordance with a variety of aspects of the disclosure is described above would not have to be performed in the precise order described. Rather, various steps can be handled in reverse order or simultaneously or not at all.
[00056] While several implementations have been described and illustrated herein, a variety of other means and/or structures for performing the function and/or obtaining the results and/or one or more of the advantages described herein may be utilized, and each of such variations and/or modifications is deemed to be within the scope of the implementations described herein. More generally, all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings is/are used. Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific implementations described herein. It is, therefore, to be understood that the foregoing implementations are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, implementations may be practiced otherwise than as specifically described and claimed. Implementations of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein. In addition, any combination of two or more such features, systems, articles, materials, kits, and/or methods, if such features, systems, articles, materials, kits, and/or methods are not mutually inconsistent, is included within the scope of the present disclosure.

Claims
I/We Claim:
1. A system for bioethanol production from lignocellulosic biomass, comprising:
a. a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components;
b. a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars;
c. a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using co-culture of microbial strains;
d. a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth;
e. a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration;
f. a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production.
2. The system of claim 1, wherein said pretreatment unit utilizes an acid pretreatment process to remove said lignin and hemicellulose components from said lignocellulosic biomass.
3. The system of claim 1, wherein said hydrolysis unit comprises a cellulase enzyme complex for the enzymatic conversion of said cellulose into said fermentable sugars.
4. The system of claim 1, wherein said fermentation unit utilizes Saccharomyces cerevisiae and an isolated pentose sugar fermenting yeast as said microbial consortium for the fermentation of said fermentable sugars into said ethanol.
5. The system of claim 1, wherein said separation unit comprises a centrifuge for the initial separation of said ethanol from said fermentation broth.
6. The system of claim 1, wherein said distillation unit comprises a fractional distillation column for the purification of said ethanol to at least 99.5% by volume.
7. The system of claim 1, wherein said monitoring and control system includes sensors for detecting temperature, pH, and ethanol concentration within said fermentation unit.
8. The system of claim 1, further comprising a waste management unit operatively connected to said separation unit, wherein said waste management unit is configured to treat and dispose of residual biomass and other waste products generated during said bioethanol production process.
9. The system of claim 1, wherein said lignocellulosic biomass comprises agricultural residues selected from the group consisting of corn stover, wheat straw, rice straw, and sugarcane bagasse.
10. A method for producing bioethanol from lignocellulosic biomass, comprising the steps of:
a. pretreating said lignocellulosic biomass in a pretreatment unit to remove lignin and hemicellulose components, thereby obtaining a pretreated biomass;
b. enzymatically hydrolyzing said pretreated biomass in a hydrolysis unit to convert cellulose into fermentable sugars;
c. fermenting said fermentable sugars in a fermentation unit using co-culture of microbial consortium to produce ethanol;
d. separating said ethanol from a fermentation broth in a separation unit;
e. purifying said ethanol to a desired concentration in a distillation unit;
f. monitoring and controlling said pretreatment, hydrolysis, fermentation, separation, and distillation units using a monitoring and control system to optimize the bioethanol production process.

SYSTEM FOR BIOETHANOL PRODUCTION FROM LIGNOCELLULOSIC BIOMASS
Abstract
The present disclosure provides a system for bioethanol production from lignocellulosic biomass, comprising a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components; a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars; a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using co-culture of microbial consortium; a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth; a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration; a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production.
Fig. 1 , Claims:Claims
I/We Claim:
1. A system for bioethanol production from lignocellulosic biomass, comprising:
a. a pretreatment unit configured to process said lignocellulosic biomass into a pretreated biomass by removing lignin and hemicellulose components;
b. a hydrolysis unit operatively connected to said pretreatment unit, wherein said hydrolysis unit is configured to enzymatically convert cellulose in said pretreated biomass into fermentable sugars;
c. a fermentation unit operatively connected to said hydrolysis unit, wherein said fermentation unit is configured to ferment said fermentable sugars into ethanol using co-culture of microbial strains;
d. a separation unit operatively connected to said fermentation unit, wherein said separation unit is configured to separate said ethanol from the fermentation broth;
e. a distillation unit operatively connected to said separation unit, wherein said distillation unit is configured to purify said ethanol to a desired concentration;
f. a monitoring and control system operatively connected to said pretreatment unit, said hydrolysis unit, said fermentation unit, said separation unit, and said distillation unit, wherein said monitoring and control system is configured to regulate and optimize the operation of the system for efficient bioethanol production.
2. The system of claim 1, wherein said pretreatment unit utilizes an acid pretreatment process to remove said lignin and hemicellulose components from said lignocellulosic biomass.
3. The system of claim 1, wherein said hydrolysis unit comprises a cellulase enzyme complex for the enzymatic conversion of said cellulose into said fermentable sugars.
4. The system of claim 1, wherein said fermentation unit utilizes Saccharomyces cerevisiae and an isolated pentose sugar fermenting yeast as said microbial consortium for the fermentation of said fermentable sugars into said ethanol.
5. The system of claim 1, wherein said separation unit comprises a centrifuge for the initial separation of said ethanol from said fermentation broth.
6. The system of claim 1, wherein said distillation unit comprises a fractional distillation column for the purification of said ethanol to at least 99.5% by volume.
7. The system of claim 1, wherein said monitoring and control system includes sensors for detecting temperature, pH, and ethanol concentration within said fermentation unit.
8. The system of claim 1, further comprising a waste management unit operatively connected to said separation unit, wherein said waste management unit is configured to treat and dispose of residual biomass and other waste products generated during said bioethanol production process.
9. The system of claim 1, wherein said lignocellulosic biomass comprises agricultural residues selected from the group consisting of corn stover, wheat straw, rice straw, and sugarcane bagasse.
10. A method for producing bioethanol from lignocellulosic biomass, comprising the steps of:
a. pretreating said lignocellulosic biomass in a pretreatment unit to remove lignin and hemicellulose components, thereby obtaining a pretreated biomass;
b. enzymatically hydrolyzing said pretreated biomass in a hydrolysis unit to convert cellulose into fermentable sugars;
c. fermenting said fermentable sugars in a fermentation unit using co-culture of microbial consortium to produce ethanol;
d. separating said ethanol from a fermentation broth in a separation unit;
e. purifying said ethanol to a desired concentration in a distillation unit;
f. monitoring and controlling said pretreatment, hydrolysis, fermentation, separation, and distillation units using a monitoring and control system to optimize the bioethanol production process.