DESC:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See section 10 and rule 13)

TITLE:
AN AIR PURIFICATION SYSTEM AND A METHOD THEREOF

Air Ok Technologies Pvt. Ltd.,
a company incorporated under the laws of India, having its address at
IITM Incubation Cell, Third Floor, Phase 2, IITM Research Park,
Kanagam Road, Taramani, Chennai – 600113, Tamil Nadu, INDIA

The following specification particularly describes the invention and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
The present application claims priority from an Indian Provisional Patent Application Number 201741006808 filed on 27th February 2017.
FIELD OF THE INVENTION
The present invention relates to a system and a method for air purification.

BACKGROUND OF THE INVENTION
Air pollution has raised various environmental and health concerns leading to development of air purifiers for removal of dust and pollutant particles from air.
Major technologies for gaseous and particulate removal from air stream such as alumina, silica gel, high efficient particulate arrestor (HEPA), cyclone separator, electrostatic precipitator etc. have increased the capabilities of air purifiers gradually over the time. However, major concerns regarding efficiency, noise level, frequency of filter replacement, electricity consumption, and economic feasibility yet exists.
Therefore, the object of present invention is to solve one or more of aforementioned issues.

SUMMARY OF THE INVENTION
In first embodiment, the present invention provides an air purification system comprising an inlet section for purification of air, a filtration unit adapted inside the inlet housing, and a granular carbon media filled in outer cavity of the filtration unit, and an outlet section, connected to the inlet section, for outflow of purified air from inner cavity of the filtration unit of the inlet section, and a fan adapted inside the outlet housing above the inner cavity of the filtration unit of the inlet housing.
According to the present invention, the inlet section comprises an inlet housing having inlet ports inclined downwards for inflow of air inside the inlet housing.
According to the present invention, the filtration unit has at least two cavities.
According to the present invention, the outlet section comprises an outlet housing having outlet ports inclined upwards for outflow of purified air.
According to the present invention, operation of fan pulls air inside the inlet housing through the inlet ports in the filtration unit, the air is purified by a pre-filter and the granular carbon media of the filtration unit and the purified air is outflowed from the inner cavity of the filtration unit through the outlet ports of the outlet housing.
In second embodiment, a housing for air purification is provided. The housing for air purification comprising an inlet section having inlet ports inclined downwards for inflow of air, and an outlet section having outlet ports inclined upwards for outflow of air.
In third embodiment, a filtration unit for air purification is provided. The filtration unit for air purification unit comprising at least two star polyhedron shaped wall having at least 5 edges arranged in concentric form, spaced apart, creating at least two cavities.
In fourth embodiment a granular carbon media for air purification is provided. The granular carbon for air purification is selected from a group comprising a Carbon Media Type 1 derived from a coconut shell wherein, the granular carbon media is energized by using steam at 600°C, a Carbon Media Type 2 derived from a coconut shell, wherein the granular carbon media is energized by using strong alkali potassium hydroxide (KOH), and a Carbon Media Type 3 derived from a coconut shell, wherein the said granular carbon media is energized by using acidic potassium Permanganate (KMnO4).
In fifth embodiment a method of air purification is provided. The method of air purification comprising the steps of pulling the air, by a fan adapted, inside outer section, at the top of inner cavity of a filtration unit, through inlet ports inside inlet section, passing the air through the filtration unit adapted within the inlet section, wherein the air is first purified when contacting a pre-filter nylon cloth adapted to a wall of the filtration unit and the air is subsequently purified based on a granular carbon media filled in outer cavity of the filtration unit, and outflowing the purified air from the inner cavity of the filtration unit, by the fan, through outlet ports of outlet section.

BRIEF DESCRIPTION OF DRAWINGS
Reference will be made to embodiments of the invention, example of which may be illustrated in the accompanying figure(s). These figure(s) are intended to be illustrative, not limiting. Although the invention is generally described in the context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 shows an air purification system according to an embodiment of the present invention;
Figure 2 shows inclination of inlet and outlet ports for air inflow and outflow of a filtration housing according to an embodiment of the present invention;
Figure 3A shows air inflow through inlet ports of normal filtration system;
Figure 3B shows air inflow through downward inclined inlet ports of a filtration housing according to an embodiment of the present invention;
Figure 4A shows air outflow through outlet ports of normal filtration system;
Figure 4B shows air outflow through upwards inclined outlet ports of a filtration housing according to an embodiment of the present invention;
Figure 5 shows a filtration unit for purification of air according to an embodiment of the present invention;
Figure 6 shows a supporting frame for filtration unit according to an embodiment of the present invention; and
Figure 7 shows a cross section view of air purification system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
In first embodiment, the present invention provides an air purification system comprising an inlet section for inflow of air, a filtration unit adapted inside the inlet section for purification of air, and an outlet section connected to the inlet section, for outflow of purified air.

According to the present invention, the inlet section comprises an inlet housing having inlet ports inclined downwards for inflow of air inside the inlet housing. Advantageously, the inlet section comprises of inlet ports inclined downwards ranging from 30 degrees to 60 degrees for inflow of air. The inclination of the inlet ports allows maximum contact of air with the filtration unit thereby increasing the efficiency of purification of air. The inlet ports are evenly spaced and may be in the form of rings.
According to the present invention, the filtration unit is star polyhedron shaped having at least 5 edges. The inclination of the inlet ports and the star polyhedron shape filtration unit allows maximum surface area for contact of air with the filtration unit thereby increasing the efficiency of purification of air. The filtration unit is formed by at least two star polyhedron shaped wall having at least 5 edges arranged in concentric form with varying diameter thereby creating at least two cavities.
According to the present invention, the outer cavity of the filtration unit is filled with granular carbon media of different types depending upon the purification of the air and the inner cavity is used for outflow of purified air, through the outlet housing of the outlet section.
According to the present invention, the star polyhedron shaped wall having at least 5 edges comprises poly ethylene terephthalate (PET) nylon pre-filter cloth of preferably 80 - 200 micron pore size.
According to the present invention, the granular carbon media is selected from a group consiklsting of Carbon Media Type 1, Carbon Media Type 2, Carbon Media Type 3, or combination in different proportions thereof. The combination of granular carbon media should be chemically compatible. The Carbon Media Type 1 is derived from a coconut shell wherein, the granular carbon may be energized by using steam at 600°C. The Carbon Media Type 2 is derived from a coconut shell, wherein the granular carbon may be energized by using strong alkali potassium hydroxide (KOH). The Carbon Media Type 3 is derived from a coconut shell, wherein the granular carbon may be energized by using acidic potassium Permanganate (KMnO4).
According to the present invention, the granular media has a mean particle diameter of 1.5 mm – 1.7 mm, preferably less than 1.5 mm, and an active surface area of 900-1400 m2/g, preferably more than 1400 m2/gm.
According to the present invention, the filtration unit comprising three cavities formed by three star polyhedron shaped wall having at least 5 edges arranged in concentric form with varying diameter, the first and second outer cavities of the filtration unit may be filled with granular carbon media as follows:
S.No. First outer cavity Second outer cavity
1 Carbon Media Type 1 Carbon Media Type 2
2 Carbon Media Type 2 Carbon Media Type 1
3 Carbon Media Type 1 Carbon Media Type 3
4 Carbon Media Type 3 Carbon Media Type 1
5 Carbon Media Type 2 Carbon Media Type 3
6 Carbon Media Type 3 Carbon Media Type 2
7 X% of Carbon Media Type 1 + Y% of Carbon Media Type 2 X% of Carbon Media Type 1 + Y% of Carbon Media Type 3
8 X% of Carbon Media Type 1 + Y% of Carbon Media Type 3 X% of Carbon Media Type 1 + Y% of Carbon Media Type 2

According to the present invention, the outlet section comprises of centrifugal fan adapted at the top of the filtration unit. The centrifugal fan draws the air inside the filtration unit and the outflows the purified air from the filtration unit through the outlet ports. According to the present invention, the outlet section comprises an outlet housing having outlet ports inclined upwards for outflow of purified air. Advantageously, the outlet ports are inclined upwards ranging from 30 degrees to 60 degrees for outflow of purified air. The inclination of the outlet ports prevents purified air to be pulled again through the inlet ports of the inlet section thereby increasing the efficiency of purification of air. The outlet ports are evenly spaced and may be in the form of rings.
According to the present invention the inlet section and the outlet section can have separate housing or form a part of a single housing.

In second embodiment, the present invention provides an air purification system comprising an inlet section for inflow of air, a filtration unit adapted inside the inlet section for purification of air, an outlet section, having a centrifugal fan, connected to the inlet section, for outflow of purified air and a control unit connected to centrifugal fan for control of air purification.
According to the present invention, the control unit comprises of controller, sensors, and a communication unit. The controller is configured to manually and automatically operate the centrifugal fan for purification of the air. The controller is configured to operate automatically (switch on/off) when user set air parameters for air purification levels are achieved, based on air quality data received from the sensors. Advantageously, the controller is configured to communication with remote user device either wired or wireless.
According to the present invention, the communication unit of the control unit allows monitor and control of air purification system through remote location including transferring of data regarding the operation of the air purification to remote server.

In third embodiment, the present invention provides an air purification system comprising an external body made up of specially designed rings spaced vertically for providing inlets and outlets. The system may comprise a metallic frame on the base part of the system for supporting to various parts of the system. Further, the system comprises an air filter wherein, the air filter comprise pre-filters and filter media positioned inside the external body on lower section of the metallic frame. The air filter may be a dual stratified. Furthermore, the system may comprise a top part and a centrifugal fan mounted on upper section of the metallic frame above the air filter.
According to the present invention, the centrifugal fan may be a turbomachine, wherein the centrifugal fan is capable of providing higher air flow rates against a pressure drop and consume less energy. The centrifugal fan, while rotating, may take indoor air as an input, from an eye of the said centrifugal fan, and further may deliver the said air radially out. The centrifugal fan may be configured to enable the circulation of indoor air through the system.
According to the present invention, the metallic frame supporting the centrifugal fan is provided. The metallic frame may be designed to have structural strength against the mechanical dynamics of the centrifugal fan. The metallic frame may be configured to support the various components of the system. The metallic frame may have two plates wherein, one of the plate may be placed on the top and the other plate may be placed at the bottom of the metallic frame. The plurality of cylindrical rods may be placed in the middle of the metallic frame. The plate placed at the top of the metallic frame may have a grill type perforations and the plate placed at bottom of the metallic frame may have a hexagrammic hole at the center. The base part may have a hexagrammic hole at the center and a plurality of holes at the periphery of circle on the upper side of the base part. The holes on the base part may enable the metallic frame to be fixed on the base part.
According to the present invention, external body for the air purification system may consist of plurality of rings. The external body may comprise of one or more inlet rings and outlet rings, wherein the inlet ring and outlet ring may have predefined thickness, predefined width, predefined inner and outer diameter and a predefined tip angle.
According to the present invention, the external body may comprise of one or more rings having hexagrammic hole at the bottom plate and a circular hole on the top plate. The rings may comprise plurality of holes wherein the said holes may enable insertion of metallic frame.
According to the present invention, a separating ring may be placed in between the inlet rings and outlet rings. The number of inlet rings may be decided by the the height of each ring, the space required between each ring and to cover the height of the filter that may be designed. The number of outlet rings may be decided by the height of each ring, the required space between each ring and to cover the height of the said centrifugal fan.
According to the present invention, the top part of the air purification system may be configured to accommodate electronic and electrical systems and human machine interface of the air purification system. According to the present invention, the air filter of the air purification system may be a dual stratified air filter, wherein the air filter may be configured to treat the polluted indoor air by reducing the concentrations of acidic gaseous pollutants like CO2, CO, H2S, NOX, SOX etc., alkaline gaseous pollutants like ammonia, organic amines etc., bio-aerosols, hazardous volatile organic compounds like benzene, ethylene, toluene, xylene, formaldehyde, etc. and also the particulates (PM10, PM2.5, allergens). The air filter body may be designed in such a way to provide a large effective surface area to have substantial number of layers for Mass Transfer Zone (MTZ) to remove higher amounts of pollutants and further to handle a large indoor air flow with very low pressure drop. Advantageously, the lower thickness of the air filter may enable reduced power requirement for the air purification system. The air filter further comprise pre-filters and filter media positioned inside the external body on lower section of the metallic frame. On exhaustion of the filter media, the filter media may be replaced by means of the removable top and bottom plates and the filter media may be reactivated and reused. Furthermore, the system may comprise a top part and a centrifugal fan mounted on upper section of the metallic frame above the air filter. The pre-filter may be cleaned and reused.
According to the present invention, the air filter assembly may comprise a filter body, a filter media and a top and bottom plates. The filter body may be a triple walled triangular mesh hexagrammic hollow prism made of plastic material. An outer wall of the filter body may be of a predefined diameter, preferably of 278 mm in diameter, but may not be limited to said dimensions. The distance between the outer and inner walls of the filter body may be preferably of 10 mm and a wall thickness may be of 2 mm throughout the filter body, but may not be limited to said dimensions. The overall height of the filter body may be 302 mm and each square side of the inner and outer wall may be of 77.94 mm and 66.40 mm wide respectively, but may not be limited to said dimensions. The filter body may be of a polyhedral star shape wherein, the said shape may enable to provide higher effective surface area than a cylindrical shaped filter body for air purification and a mesh-wall to provide greater exposed surface area of the filter media. The higher effective surface area may enable to minimize the requirement of thicker media layers which may result in lower pressure drop across the section and hence reduce the power requirement. Although the shape of the filter body may be a polyhedral star and enables a lot of advantages as mentioned, but may not be limited to the said shape and advantages.
According to the present invention, the filter media may be a carbon media of 3 types, used in the air filter or air purification system. In a preferred embodiment, the carbon media type 1 may be a granular carbon derived from a coconut shell wherein, the granular carbon is energized by using steam at 600°C. The carbon media type 2 is a granular carbon derived from a coconut shell, wherein the said granular carbon is energized by using strong alkali potassium hydroxide (KOH). The carbon media type 3 is a granular carbon derived from a coconut shell, wherein the granular carbon is energized by using acidic potassium Permanganate (KMnO4). The filter media may not be limited to the said media and said processes.

According to the present invention, the granular carbon is derived from coconut shell used in the air filter may have a mean particle diameter of 1.5 mm – 1.7 mm, preferably less than 1.5 mm, and an active surface area of 900-1400 m2/g, preferably more than 1400 m2/gm. The granule size of the filter media may be chosen based on the pressure drop consideration and a minimum particle size wherein, the particles having greater or equal sizes with respect to the said particle size may be filtered from the air stream. The filter media may be enclosed within a poly ethylene terephthalate (PET) nylon pre-filter cloth of preferably 80 - 200 micron pore size and may be sandwiched inside the walls of the filter body. The granular carbon and filter media specifications may not be limited to the above-mentioned specifications.
According to the present invention, two ends of the filter body may be provided with one or more top and bottom plates of preferably hexagram shape, in order to fit exactly to the filter body. The plates are designed in order to cover the filter media within the filter body and prevent any escape of air without passing the filter media through the ends. The plates may be made of plastic material and may be removable to enable the replacement of the filter media on exhaustion of the said filter media. The said top and bottom plates may not be limited to the above-mentioned specifications.

In fourth embodiment, the present invention provides a method of air purification, the method comprising the steps of:
(a) pulling the air, by a fan adapted, inside outer section, at the top of inner cavity of a filtration unit, through inlet ports inside inlet section;
(b) passing the air through the filtration unit adapted within the inlet section, wherein the air is first purified when contacting a pre-filter nylon cloth adapted to a wall of the filtration unit and the air is subsequently purified based on a granular carbon media filled in outer cavity of the filtration unit; and
(c) outflowing the purified air from the inner cavity of the filtration unit, by the fan, through outlet ports of outlet section.
According to the present invention, the filtration unit comprising more than two cavities, the outer cavities are filled with granular carbon media of different types and the air is purified based on the granular carbon media contained in outer cavities thereby removing particulate matters and gaseous pollutants from air.

In fifth embodiment, the present invention provides a method of air purification, the method comprising five-stages for air purification, wherein in the first stage of purification, contaminated air pass through the pre-filter of a filtration unit. On completion of the first stage, the air enters into granular carbon media in first outer cavity of the filtration unit, the second stage, third stage and fourth stage will be enabled simultaneously. The second stage and third stage will complete partially even after the completion of fourth stage in granular carbon media in first outer cavity of the filtration unit. Further, on completion of the fourth stage, air enters in to granular carbon media in second outer cavity of the filtration unit, fifth stage will be enabled along with the continuation of second stage and third stage. The second stage, third stage and fifth stage will complete simultaneously.
According to the present invention, the pre-filter is a poly ethylene terephthalate (PET) nylon pre-filter cloth of preferably 80 - 200 micron pore size adapted to the walls of the filtration unit.
According to the present invention, the stage wise purification process flow is as follows:
(a) In the first stage, coarse particles will be removed by pre-filter of the filtration unit;
(b) In the second stage, very fine particles will be separated due impaction, interception and diffusion processes by the granular carbon media in both the cavities;
(c) In the third stage, reduction of volatile organic compounds concentration take place Due to adsorption process in Mass Transfer Zones (MTZ) of granular carbon media in both cavities;
(d) In the fourth stage, sorption of ethylene, vinyl chloride, Ammonia etc. and oxidation of bio aerosols like allergens, Bacteria, Fungi etc. take place in the MTZ of granular carbon media in first outer cavity of the filtration unit; and
(e) In the fifth stage, sorption of acidic gaseous pollutants like CO2, SO2, NO, NO2, H2S etc. take place in the MTZ of granular carbon media in second outer cavity of the filtration unit.

According to the present invention, in the method of air purification, the particulate pollutants and gaseous pollutants may be removed simultaneously.
According to the present invention, the method of air purification results in reduction in the concentrations of coarse particles, fine particles and the gaseous pollutants in the air stream.

The subject matter is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of the claimed subject matter. It may be evident however, that such matter can be practiced with these specific details. In other instances, well-known structures as shown in diagram form in order to facilitate describing the invention.

Referring Figure 1 shows an air purification system (100) comprising a filtration housing (110), encapsulating a filtration unit (not shown) and centrifugal fan (not shown), for purification of air and a control panel (140) connected to the centrifugal fan (not shown) of the filtration housing (110).
As shown in the Figure 1, the filtration housing (110) comprises inlet section (120) having inlet ports (125) for inflow of the air for purification. As shown in the Figure 1, the inlet ports (125) of the filtration housing (110) are inclined downwards ranging from 30 degrees to 60 degrees, thereby allowing the air to flow inside the housing. The filtration unit (not shown) is adapted within the inlet section (120) of the filtration housing (110). The inclination of the inlet ports (125) of the inlet section (120) allows maximum contact of air with the filtration unit (not shown) thereby increasing the efficiency of purification of the air.
As shown in the Figure 1, the filtration housing (110) comprises outlet section (130) having outlet ports (135) for outflow of the purified air through the centrifugal fan (not shown) from the filtration unit (not shown) adapted within the inlet section (120) of the filtration housing (110). As shown in the Figure 1, the outlet ports (135) of the filtration housing (110) are inclined upwards ranging from 30 degrees to 60 degrees, thereby allowing the purified air to flow upwards outside the filtration housing (110), the inclination of the outlet ports (135) prevents the purified air to be pulled again from the inlet section (120) thereby increasing the efficiency of purification of the air.
As shown in Figure 1, the control panel (140) comprises of controller (not shown), sensors (not shown), and a communication unit (not shown). The controller is configured to manually and automatically operate the centrifugal fan (not shown) for purification of the air. The controller (not shown) is configured to operate automatically (switch on/off) when user set air parameters for air purification level is achieved, based on air quality data received from the sensors (not shown).
As shown in Figure 1, the control panel (140) allows monitor and control of air purification system (100) through remote location including transferring of data, through the communication unit (not shown), regarding operation of the air purification to remote server.
Referring Figure 2 shows inclination (215, 225) of inlet ports (210) and outlet ports (220) for air inflow and outflow of a filtration housing (200) according to an embodiment of the present invention.
As shown in Figure 2, the inlet ports (210) are inclined (215) downwards ranging from 30 degrees to 60 degrees thereby allowing maximum contact of air with the filtration unit (not shown).
As shown in Figure 2, the outlet ports (220) are inclined (225) upwards ranging from 30 degrees to 60 degrees thereby allowing the filtered air to flow upwards. The upward inclined (225) outlet ports prevents purified air from being pulled back again through the inlet ports (210) thereby resulting in increased efficiency of purification of air.

Referring Figure 3A shows air inflow (320) through inlet ports (310) to the filtration mechanism (330) of normal filtration system.
As shown in Figure 3A, the contact of the air (340) with the filtration mechanism (330) of normal filtration system is for minimum period since the inlet ports (310) are arranged at 90 degrees allowing the inflow air (320) to be in direct contact with the filtration mechanism (330) and passing it straight, thereby, decreasing the efficiency of purification of air through normal filtration system.

Referring Figure 3B shows air inflow (360) through downward inclined inlet ports (350) of a filtration housing (not shown) according to an embodiment of the present invention.
As shown in Figure 3B, the downward inclined inlet ports (350) allow the air inflow (360) to have inclined contact (380) with the granular carbon media (not shown) of a filtration unit (370) thereby maximizing the contact of air inflow (360) with the granular carbon media (not shown) of the filtration unit (370) resulting in enhanced efficiency of air purification.
As shown in Figure 3B, the inlet ports (350) are inclined downwards ranging from 30 degrees to 60 degrees.

Referring Figure 4A shows air outflow (420) through outlet ports (410) of normal filtration system. As shown in Figure 4A, the air outflow (420) of the purified air from the fan (430) of the normal filtration system passes straight through the outlet ports (410) resulting in purified air being pulled back again to the inlet ports (not shown) of the normal filtration system, thereby decreasing the efficiency of purification of air.

Figure 4B shows air outflow (450) through upwards inclined outlet ports (440) of a filtration housing (not shown) according to an embodiment of the present invention. As shown in Figure 4B, the outlet ports (440) are inclined upwards ranging from 30 degrees to 60 degrees. The upward inclined outlet ports (440) allow purified air from the centrifugal fan (460) to flow upwards (450) resulting in purified air not being pulled back through the inlet ports (not shown) thereby increasing in efficiency of purification of air.

Referring Figure 5 shows a filtration unit (500) for purification of air according to an embodiment of the present invention. The filtration unit (500) is hexagrammic shaped thereby providing maximum surface area contact with the air to be purified. The inclination of inlet ports (not shown) of a filtration housing (not shown) downwards ranging from 30 degrees to 60 degrees for inflow of the air to the filtration unit (500) having hexagrammic shape provides maximum contact of air with the filtration unit (500) thereby increasing the efficiency of purification of the air.
As shown in Figure 5, the filtration unit comprises of three hexagrammic shaped filtration wall (510, 520, 530) arranged in concentric form, thereby, creating two cavities (540, 550).
As shown on Figure 5, the hexagrammic shaped wall (510, 520, 530) can be made of metal, fiber, etc. and has a poly ethylene terephthalate (PET) nylon pre-filter cloth of preferably in range of 80 - 200 micron pore size and may be adapted to the hexagrammic shaped wall (510, 520, 530).
As shown in Figure 5, the two cavities (540, 550) are filled with granular carbon media for purification of air. The different types of granular carbon media that can be filled in the cavities (540, 550) includes carbon media type 1, carbon media type 2, carbon media type 3, and combination thereof. The carbon media type 1 may be a granular carbon derived from a coconut shell wherein, the said granular carbon may be energized by using steam at 600°C. The carbon media type 2 may be a granular carbon derived from a coconut shell, wherein the said granular carbon may be energized by using strong alkali potassium hydroxide (KOH). The carbon media type 3 may be a granular carbon derived from a coconut shell, wherein the said granular carbon may be energized by using acidic potassium Permanganate (KMnO4). The granular carbon derived from coconut shell may have a mean particle diameter of 1.5 mm – 1.7 mm, preferably less than 1.5 mm, and an active surface area of 900-1400 m2/g, preferably more than 1400 m2/gm.
As shown in Figure 5, the cavities (540, 550) can be filled with granular carbon media as discussed above.
As shown in Figure 5, the air passes through the hexagrammic walls (510, 520, 530) and through the cavities (540, 550) thereby purifying the air to the maximum level. The purified air is pulled by the centrifugal fan (not shown) from the inner cavity (560).

Referring Figure 6 shows supporting frame (600) for filtration unit (610) according to an embodiment of the present invention. The filtration unit (610) is encapsulated within a supporting frame (600) having a support base (620), a support top (630) and cylindrical rods (640) connecting the support base (620) and the support top (630).
As shown in Figure 6, the support top (630) comprises a fan slot (650) for adapting the centrifugal fan (not shown) for outflow of purified air from the filtration unit (610) through the outlet ports (not shown).
As shown in Figure 6, the support frame (600) can be made of metal or composite material or combination thereof.
Referring Figure 7 shows a cross section view of air purification system (700) according to an embodiment of the present invention. The air purification system (700) comprises a housing (710), a filtration unit (750) adapted within the housing (710) for purification of air, a centrifugal fan (760) adapted within the housing (710) to the pull the air inside the filtration unit (750) and outflow the purified air, and a control panel (740) connected at the top of the housing (710) for control and management of the centrifugal fan (760) for purification of air.
As shown in Figure 7, the housing (710) comprises an inlet section (720) for inflow of air inside the housing (710) and an outlet section (730) for outflow of purified air from housing (710). The inlet section (720) of the housing (710) comprises inlet ports (725) inclined downwards ranging from 30 degrees to 60 degrees. The inclination of the inlet ports (725) allow maximum contact of air with the granular carbon media filled in cavities (752, 754) of filtration unit (750) resulting in enhanced purification of air.
As shown on Figure 7, the outlet section (730) of the housing (710) comprises of outlet ports (735) inclined upwards ranging from 30 degrees to 60 degrees. The inclination of the outlet ports (735) allow air to flow upwards thereby preventing the purified air to be pulled back through the inlet ports (725) of the inlet section (720) of the housing (710) resulting in enhanced efficiency in purification of air.
As shown in Figure 7, the filtration unit (750) comprises three hexagrammic shaped wall (751, 753, 755) arranged in concentric form, spaced apart, resulting in three cavities (752, 754, 756). The hexagrammic shaped wall (751, 752, 753) can be made of metal, fiber, etc. and has a poly ethylene terephthalate (PET) nylon pre-filter cloth of preferably in range of 80 - 200 micron pore size. The first cavity (752) of the filtration unit (750) is filled with granular carbon media of first category and the second cavity (754) is filled with granular carbon media of second category, the granular carbon media of first and second category are selected based on air purification need. Advantageously, granular carbon media of various categories can be filled in cavities (752, 754) of the filtration unit. The third cavity (756) is used to pull the purified air from the filtration unit (750) by the centrifugal fan (760) adapted at the top of the filtration unit (750) within the outlet section (730) of the housing (710). The centrifugal fan (760) pulls the air inside the inlet section (720) of the housing (710) for purification of air through the filtration unit (750) and outflows the purified air from the third cavity (756) of the filtration unit (750) through the outlet ports (735) of the outlet section (730) of the housing (710).
As shown in Figure 7, in the first stage, coarse particles will be removed by pre-filter of the hexagrammic wall (751), in subsequent stages, very fine particles will be separated due impaction, interception and diffusion processes by the granular carbon media in cavities (752, 754) of the filtration unit (750), reduction of volatile organic compounds concentration take place due to adsorption process in Mass Transfer Zones (MTZ) of granular carbon media in cavities (752, 754) of the filtration unit (750), sorption of ethylene, vinyl chloride, Ammonia etc. and oxidation of bio aerosols like allergens, bacteria, fungi etc. take place in the MTZ of carbon media in first cavity (752) of the filtration unit (750), sorption of acidic gaseous pollutants like CO2, SO2, NO, NO2, H2S etc. take place in the MTZ of granular carbon media in second cavity (754) of the filtration unit (750).

INDUSTRIAL APPLICABILITY
It is apparent that the air purification system and a method thereof of the present invention having inclined inlet outlet ports, a filtration unit having at least five-edge star polyhedron shape, and a granular carbon media provides maximum contact of air with the granular carbon media contained in the cavity of filtration unit thereby resulting in enhanced efficiency of purification of air. Therefore, the system and method of present invention including the inlet and outlet ports, the filtration unit, and the granular carbon media provides an efficient and cost-effective way for removal of both particulate matter and gaseous pollutant from the air.
In addition, the air purification system and method can remove volatile organic compounds (VOCs), allergens, air borne bacteria, acidic, alkaline gaseous pollutants, and particulate pollutants from the air thereby resulting its vast utility in many facilities like industrial environments, hospitals, clinics, classrooms, chemical laboratories, workshops, commercial/corporate buildings, residential buildings, hotels etc.
The foregoing description of the invention has been set merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the substance of the invention may occur to person skilled in the art, the invention should be construed to include everything within the scope of the disclosure.
,CLAIMS:We claim:
1. An air purification system (101) comprising:
an inlet section for purification of air, wherein the inlet section comprises:
an inlet housing having inlet ports inclined downwards for inflow of air inside the inlet housing;
a filtration unit adapted inside the inlet housing, wherein the filtration unit has at least two cavities; and
a granular carbon media filled in the outer cavity of the filtration unit; and
an outlet section, connected to the inlet section, for outflow of purified air from inner cavity of the filtration unit of the inlet section, wherein the outlet section comprises:
an outlet housing having outlet ports inclined upwards for outflow of purified air; and
a fan adapted inside the outlet housing above the inner cavity of the filtration unit of the inlet housing, wherein when the fan is operated the air is pulled inside the inlet housing through the inlet ports in the filtration unit, the air is purified by a pre-filter and the granular carbon media of the filtration unit and the purified air is outflowed from the inner cavity of the filtration unit through the outlet ports of the outlet housing.

2. The air purification system as claimed in claim 1, wherein the inlet section and the outlet section can be part of single housing.
3. The air purification system as claimed in claim 1, wherein the inlet ports are inclined downwards ranging from 30 degrees to 60 degrees and the outlet ports are inclined upwards ranging from 30 degrees to 60 degrees.
4. The air purification system as claimed in claim 1, wherein the filtration unit is star polyhedron shaped having at least 5 edges.
5. The air purification unit as claimed in claim 1, wherein the filtration unit comprises of at least two star polyhedron shaped wall having at least 5 edges arranged in concentric form, spaced apart.
6. The air purification system as claimed in claim 5, wherein the filtration unit comprises at least two star polyhedron shaped wall having at least 5 edges, at least two cavities are formed, the outer cavity is filled with granular carbon media of different types depending upon the purification of the air and the inner cavity is used for outflow of purified air, through the outlet housing of the outlet section.
7. The air purification system as claimed in claim 6, wherein the filtration unit having more than two cavities, the outer cavities are filled with the granular carbon media of different types and the inner cavity is used for outflow of purified air.
8. The air purification system as claimed in claim 1, wherein the star polyhedron shaped wall having at least 5 edges comprises pre-filter cloth made of poly ethylene terephthalate (PET) nylon preferably in range of 80 - 200 micron pore size.
9. The air purification system as claimed in claim 1, wherein the granular carbon media is selected from a group consisting of Carbon Media Type 1, Carbon Media Type 2, Carbon Media Type 3, or combination in different proportions thereof.
10. A housing for air purification, the housing comprising:
an inlet section having inlet ports inclined downwards for inflow of air; and
an outlet section having outlet ports inclined upwards for outflow of air.
11. The housing for air purification as claimed in claim 17, wherein the inlet ports are inclined downwards ranging from 30 degrees to 60 degrees and the outlet ports are inclined upwards ranging from 30 degrees to 60 degrees.

12. A filtration unit for air purification unit, the filtration unit comprising at least two star polyhedron shaped wall having at least 5 edges arranged in concentric form, spaced apart, creating at least two cavities.
13. The filtration unit for air purification as claimed in claim 12, the outer cavity is filled with granular carbon media of different types depending upon the purification of the air and the inner cavity is used for outflow of purified air, through the outlet housing of the outlet section.
14. The filtration unit for air purification as claimed in claim 12, wherein the filtration unit having more than two cavities, the outer cavities are filled with the granular carbon media of different types and the inner cavity is used for outflow of purified air.
15. The filtration unit for air purification as claimed in claim 12, wherein the star polyhedron shaped wall having at least 5 edges comprises pre-filter cloth made of poly ethylene terephthalate (PET) nylon preferably in range of 80 - 200 micron pore size.
16. A granular carbon media for air purification, the granular carbon selected from a group comprising:
a Carbon Media Type 1 derived from a coconut shell wherein, the granular carbon media is energized by using steam at 600°C;
a Carbon Media Type 2 derived from a coconut shell, wherein the granular carbon media is energized by using strong alkali potassium hydroxide (KOH);
a Carbon Media Type 3 derived from a coconut shell, wherein the said granular carbon media is energized by using acidic potassium Permanganate (KMnO4); and
a combination thereof.
17. The granular carbon media for air purification as claimed in claim 16, wherein the granular media has a mean particle diameter of 1.5 mm – 1.7 mm, preferably less than 1.5 mm, and an active surface area of 900-1400 m2/g, preferably more than 1400 m2/gm.
18. The granular carbon media for air purification as claimed in claim 16, wherein the granular carbon media of particle diameter less than 1.7 mm removes impurities from the air stream including particulate matter and gaseous pollutants.
19. A method of air purification, the method comprising the steps of:
pulling the air, by a fan adapted, inside outer section, at the top of inner cavity of a filtration unit, through inlet ports inside inlet section;
passing the air through the filtration unit adapted within the inlet section, wherein the air is first purified when contacting a pre-filter nylon cloth adapted to a wall of the filtration unit and the air is subsequently purified based on a granular carbon media filled in outer cavity of the filtration unit; and
outflowing the purified air from the inner cavity of the filtration unit, by the fan, through outlet ports of outlet section.
20. The method of air purification as claimed in claim 19, wherein the filtration unit comprising more than two cavities, the outer cavities are filled with granular carbon media of different types and the air is purified based on the granular carbon media contained in outer cavities thereby removing particulate matters and gaseous pollutants from air.
Dated this 27th day of February 2018

Priyank Gupta
Agent for the applicant
IN/PA-1454