High degree of substitution quaternary ammonium cationic starch flocculating agent and method for synthesizing same

A cationic starch, high degree of substitution technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of low reaction conversion rate and high equipment and process requirements, and achieve the effects of high purity, increased economic benefits, and easy availability of raw materials

Inactive Publication Date: 2007-07-04
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the reaction conversion rate is low, because it is a soli

Method used

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  • High degree of substitution quaternary ammonium cationic starch flocculating agent and method for synthesizing same
  • High degree of substitution quaternary ammonium cationic starch flocculating agent and method for synthesizing same
  • High degree of substitution quaternary ammonium cationic starch flocculating agent and method for synthesizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 25g of absolute dry cornstarch (water 12.56%), 5mL of 50% sodium hydroxide and 3mL of isopropanol into a glass bottle equipped with a stirrer, stir for 15min, and then alkalize at 50°C for 1h. Mix 5mL of quaternary ammonium salt solution (15g of 3-chloro-2-hydroxypropyltrimethylammonium chloride dissolved in 5mL of water) and 5mL of 10% sodium hydroxide solution and spray it on the starch surface as evenly as possible, then add 2.5g of diethanolamine, stirred and mixed evenly at room temperature, pre-dried in vacuum at 60°C until the water content of the starch dropped to about 20%, and then reacted at 90°C for 3h. Crush to get white fine powder cationic starch product.

Embodiment 2

[0027] Add 25g absolute dry tapioca starch (moisture content 13.16%), 5mL 50% sodium hydroxide and 4mL methanol into a glass bottle equipped with a stirrer, stir for 15min, alkalinize at 50°C for 1h, then add 15g N-(2, 3-epoxychloropropyl)trimethylammonium chloride (GTA) and 2 g of urea were mixed evenly at room temperature, then pre-dried in vacuum at 60° C. until the water content of the starch dropped to about 17%, and then reacted at 90° C. for 3 hours. Crush to get white fine powder cationic starch product.

Embodiment 3

[0029]Add 25g of absolute dry cornstarch (moisture 12.56%), 5mL of 50% sodium hydroxide and 4ml of isopropanol into a glass bottle equipped with a stirrer, stir for 15min, alkalinize at 50°C for 1h, and then add 20g of N-(2 , 3-epichloropropyl)trimethylammonium chloride (GTA) and 1mL fatty alcohol polyoxyethylene ether, stirred and mixed at room temperature, and reacted in vacuum at 80°C for 3h. Crush to get white fine powder cationic starch product.

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Abstract

The invention relates to a green flocculant- ammonium type cation starch flocculant with high replace degree. Said flocculant employs one of corn starch, wheat starch, tapioca starch, potato starch or any of mixture of them as raw material, takes 3-Chloro-2-hydroxypropyl-trimethylammonium Chloride, or epoxypropyl trimethyl ammonium chloride as cationic etherifying agent, and employs dry method to synthesize said flocculant by using sodium hydroxide and co-catalyst as complex catalyst system. The invention combines the advantage of dry method and semi-dry method, overcomes problem of agglomeration of starch during solution ejection, and solves problems of pasting and agglomeration of starch during reaction process when together with base. The invention is characterized by non post treatment, non three waste, simple processes, short reaction period, mild reaction condition, high efficiency and low cost. The flocculant is characterized when compared with normal ones by less consumption, fast settling speed, high transparency, and wide use for wastewater treatment and sludge waterless in industries such as paper making, dyeing, leathering making and petrochemical industry.

Description

technical field [0001] The invention belongs to new environment-friendly materials, and relates to a preparation method of quaternary ammonium cationic starch. Specifically, starch is used as raw material, cationic etherification agent is used as monomer, and under the catalysis of sodium hydroxide / co-catalyst composite catalytic system, the method of synthesizing high degree of substitution quaternary ammonium cationic starch flocculant by dry method. Background technique [0002] The worldwide shortage of water resources has forced governments all over the world to attach great importance to the sustainable use and reuse of water resources. Urban domestic sewage and industrial wastewater must be treated qualified before being discharged into natural water bodies, and polluted water sources must be treated qualified before they can be used by people. The status of water treatment projects in the national economy and people's livelihood has become more and more important. ...

Claims

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Application Information

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IPC IPC(8): C02F1/54C02F1/56
Inventor 王公应陈彦逍刘绍英王越曾毅
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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