Basic Aluminum Chloride Solution And Method For Producing Same

Abstract: ABSTRACT TITLE: BASIC ALUMINUM CHLORIDE SOLUTION AND METHOD FOR PRODUCING SAME A method for producing a basic aluminum chloride solution (target solution or high basicity PAC solution) includes the sequential steps of(a) adding an alkali to a basic aluminum chloride solution (raw solution or low basicity PAC solution) containing a basic aluminum chloride represented by [Al2(OH)nCl(6-n)]m (0

Patent Information

Application #

Filing Date

12 September 2018

Publication Number

13/2019

Publication Type

INA

Invention Field

CHEMICAL

Status

Email

dattaipr@vsnl.net

Parent Application

Applicants

CENTRAL GLASS COMPANY, LIMITED

5253, Oaza Okiube, Ube-shi,Yamaguchi 755-0001, Japan.

Inventors

1. Hiroyuki OOMORI

c/o Chemical Research Center (Ube)of CENTRAL GLASS COMPANY, LIMITED 5253, Oaza Okiube, Ube-shi, Yamaguchi 755-0001, Japan.

2. Shunta FURUTANI

c/o Chemical Research Center (Ube)of CENTRAL GLASS COMPANY, LIMITED 5253, Oaza Okiube, Ube-shi, Yamaguchi 755-0001, Japan

3. Masakiyo NAGATOMO

c/o Chemical Research Center (Ube)of CENTRAL GLASS COMPANY, LIMITED 5253, Oaza Okiube, Ube-shi, Yamaguchi 755-0001, Japan.

4. Akifumi YAO

c/o Chemical Research Center (Ube)of CENTRAL GLASS COMPANY, LIMITED 5253, Oaza Okiube, Ube-shi, Yamaguchi 755-0001, Japan.

5. Atsushi TAKAGI

c/o Ube Plant of CENTRAL GLASS COMPANY, LIMITED 5253, Oaza Okiube, Ube-shi, Yamaguchi 755-0001, Japan.

6. Masanori TSUKAMOTO

c/o Ube Plant of CENTRAL GLASS COMPANY, LIMITED 5253, Oaza Okiube, Ube-shi, Yamaguchi 755-0001, Japan.

Specification

Claims:WE CLAIM: 1. A method for producing a basic aluminum chloride solution, comprising the sequential steps of: (a) adding an alkali to a basic aluminum chloride solution containing a basic aluminum chloride represented by [Al2(OH)nCl(6-n)]m (0 Aluminum hydroxide was dissolved in sulfuric acid, followed by mixing calcium chloride and calcium carbonate and then removing sulfate ions as gypsum, thereby obtaining 100 g of a PAC solution having a basicity of 50% and a viscosity of 5.95 mPa?s. [0036] To 100 g of the above-mentioned low basicity PAC solution, 8.2 g of sodium carbonate was added, followed by adding 2.0 g of 36% hydrochloric acid aqueous solution (the amount of hydrochloric acid: 0.72 g). Then, the obtained reaction liquid was subjected to filtration to remove insoluble components, thereby obtaining a PAC solution having an increased basicity. As a result, the prepared PAC solution was 68% in basicity and 13.5 mPa?s in viscosity. [0037] As described in Table 1, similar to Example 1, high basicity PAC solutions were obtained except in that the amounts of the base used as alkali and the acid were changed. [0038] [Basicity measurement] Basicity was measured in accordance with the standard of JWWA K 154:2016. [0039] [Viscosity] Viscosity was measured at room temperature (25 ?C) by using a vibration-type viscometer VISCOMATE VM 100A (made by SEKONIC CORPORATION) conforming to the viscosity measurement method by a vibration-type viscometer as mentioned in JIS Z 8803:2011. In case that one was very high in viscosity to be dealt with as solid, it was judged as being gelled. [0040] [Coagulation test (jar test)] Jar test was also conducted in accordance with the standard of JWWA K 154:2016 to measure turbidity of the supernatant water after the coagulation test. As a result, turbidity of the supernatant water was 0.4. [0041] The various evaluations were conducted on the low basicity PAC solution. [0042] In the above-mentioned low basicity PAC solution preparation method, calcium carbonate was added 1.5 times at the PAC synthesis, thereby obtaining 100 g of a PAC solution having a basicity of 63%. It already turned into gel in part. Therefore, it was not possible to conduct the viscosity measurement and the jar test. [0043] To 100 g of the low basicity PAC solution, 8.3 g of sodium carbonate was added. No acid was added. After that, the obtained reaction liquid was subjected to filtration to remove insoluble components, thereby obtaining a PAC solution having a basicity of 67% and a viscosity of 214 mPa?s. Using this PAC solution, jar test was conducted. Turbidity after the test was 0.9. [0044] The evaluation results of the PAC solutions obtained by Examples 1 to 7 and Comparative Examples 1 to 3 are shown in Table 1. As to viscosity, besides immediately after the production of PAC solution, evaluation was also conducted after a half year storage at room temperature (20 to 25 ?C). Furthermore, in Examples 1 to 7, the low basicity PAC solutions and the high basicity PAC solutions were each in a range of 10 to 11 mass % in aluminum oxide concentration [0045] [Table 1] Low basicity PAC (raw material) Na2Co3 addition Acid Addition High basicity PAC (product) Jar test result After a half year Basicity [%] Viscosity [mPa.s] [g] [g] Basicity [%] Viscosity [mPa.s] Turbidity Viscosity Example 1 50 5.95 8.2 0.72 68 13.5 0.4 15.2 Example 2 50 5.95 9.3 0.72 73 15.7 0.2 19.3 Example 3 50 5.95 7.6 0.72 68 14.9 0.3 18.1 Example 4 50 5.95 7.6 0.18 67 14.8 0.4 26.9 Example 5 50 5.95 8.4 1.44 68 12.8 0.3 12.5 Example 6 50 5.95 8.2 0.72 69 13.2 0.3 16.1 Example 7 50 5.95 8.4 3.96 64 10.1 0.5 9.2 Com.Ex.1 50 5.95 0 0 50 5.95 0.9 7.2 Com.Ex.2 63 gelled 0 0 - - Not possible - Com.Ex.3 50 5.95 8.3 0 67 214 0.9 gelled [0046] From the results of Table 1, as compared with the PAC solution having a basicity of 50% of Comparative Example 1, the PAC solutions (high basicity PAC solutions) according to Examples 1 to 7 were high in basicity and were prevented from having viscosity increase. Therefore, as shown in the coagulation test results, it was possible to remove suspended matter to achieve low turbidity values, showing a superior coagulation performance. Furthermore, the PAC solutions according to Examples 1 to 7 were 9.2 to 26.9 mPa?s, not greater than 200 mPa?s at most, in viscosity even after a half year storage. [0047] Furthermore, in Comparative Example 2, it was possible to obtain a PAC having a high basicity of 63% by adding a large amount of calcium carbonate when synthesizing a PAC solution from aluminum hydroxide, but it was high in viscosity and gelled. Furthermore, in Comparative Example 3, only alkali was added to a PAC having a basicity of 50% to increase basicity. Since acid was not added, there was obtained a PAC solution having a high viscosity of 214 mPa?s, and it gelled after a half year. That is, in the case of seeking a high basicity by changing the initial charge composition or by adding alkali with no addition of acid as in Comparative Examples 2 to 3, viscosity increased, resulting in performance decline as PAC. [0048] In Comparative Example 3, it was high in viscosity, and polymerization already progressed. Therefore, the capacity to incorporate suspended matter with its polymerization in raw water is considered to be inferior. As compared with Example 1 having a similar basicity, it was low in coagulation performance, and its coagulation capacity was not as high as the basicity. That is, the PAC solutions of Examples 1 to 7, which were high in basicity and low in viscosity, resulted in the best in coagulation capacity.

Documents

Application Documents

#	Name	Date
1	201834034352-STATEMENT OF UNDERTAKING (FORM 3) [12-09-2018(online)].pdf	2018-09-12
2	201834034352-REQUEST FOR EXAMINATION (FORM-18) [12-09-2018(online)].pdf	2018-09-12
3	201834034352-PRIORITY DOCUMENTS [12-09-2018(online)].pdf	2018-09-12
4	201834034352-FORM 18 [12-09-2018(online)].pdf	2018-09-12
5	201834034352-FORM 1 [12-09-2018(online)].pdf	2018-09-12
6	201834034352-FIGURE OF ABSTRACT [12-09-2018(online)].jpg	2018-09-12
7	201834034352-DRAWINGS [12-09-2018(online)].pdf	2018-09-12
8	201834034352-DECLARATION OF INVENTORSHIP (FORM 5) [12-09-2018(online)].pdf	2018-09-12
9	201834034352-COMPLETE SPECIFICATION [12-09-2018(online)].pdf	2018-09-12
10	201834034352-Proof of Right (MANDATORY) [19-09-2018(online)].pdf	2018-09-19
11	201834034352-FORM-26 [31-10-2018(online)].pdf	2018-10-31
12	201834034352-Certified Copy of Priority Document (MANDATORY) [03-12-2018(online)].pdf	2018-12-03
13	201834034352-FORM 3 [17-01-2019(online)].pdf	2019-01-17
14	201834034352-FER.pdf	2019-11-20
15	201834034352-AbandonedLetter.pdf	2024-07-12

Search Strategy

1	Search_Strategy_201834034352_19-11-2019.pdf