Method used for processing dichloroacetic acid in cocamidopropyl betaine

A technology for cocamidopropyl betaine and cocamidopropyl dimethylamine is applied in the field of processing dichloroacetic acid in cocamidopropyl betaine, and achieves the effects of obvious effect, reduced production cost and simple process operation.

Inactive Publication Date: 2017-05-31
四川花语精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few patent documents on the degradation of dichloroacetic acid in the solution system, and most of them are aimed at the treatment of drinking water, and there are few patent documents on other aqueous solutions

Method used

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  • Method used for processing dichloroacetic acid in cocamidopropyl betaine
  • Method used for processing dichloroacetic acid in cocamidopropyl betaine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 516 grams of deionized water in the there-necked flask, join the cocamidopropyl dimethylamine of 1mol and 1.05mol chloroacetic acid (dichloroacetic acid content 0.6%) in the there-necked flask, then add 35% sodium hydroxide 24 grams of solution, stir and raise the temperature to 80°C, then add 96 grams of 35% sodium hydroxide solution, after the addition is complete, control the temperature at 80°C to 90°C, and pH between 8.5 and 9.5, keep for 3h, then Then add sodium hydroxide to increase the pH of the solution to 12-13, raise the temperature to 110°C, and after 5 hours, the reaction is completed and lower the temperature to below 70°C, add citric acid to adjust the pH to neutral, add deionized water to adjust the solid content to 35 %.

[0031] The detected dichloroacetic acid content is 90ppm (in the case of untreated residual dichloroacetic acid, calculated by product formula, the theoretical residual amount of dichloroacetic acid is 506ppm).

Embodiment 2

[0033] Put 516 grams of deionized water in the there-necked flask, join the cocamidopropyl dimethylamine of 1mol and 1.05mol chloroacetic acid (dichloroacetic acid content 0.6%) in the there-necked flask, then add 35% sodium hydroxide 24 grams of the solution, stirred and raised the temperature to 80°C, then added 96 grams of 35% sodium hydroxide solution, after the addition was completed, the temperature was controlled at 80°C to 90°C, and the pH was maintained at 8.5 to 9.5 for 3 hours, and then Add sodium hydroxide to raise the pH of the solution to 12-13, raise the temperature to 125°C, after 3 hours the reaction is complete, lower the temperature to below 70°C, add citric acid to adjust the pH to neutral, add deionized water to adjust the solid content to 35% .

[0034] The detection of dichloroacetic acid content is 37ppm (in the case of untreated residual dichloroacetic acid, calculated by product formula, the theoretical residual content of dichloroacetic acid is 506pp...

Embodiment 3

[0036] Put 516 grams of deionized water in the there-necked flask, join the cocamidopropyl dimethylamine of 1mol and 1.05mol chloroacetic acid (dichloroacetic acid content 0.6%) in the there-necked flask, then add 35% sodium hydroxide 24 grams of the solution, stirred and raised the temperature to 80°C, then added 96 grams of 35% sodium hydroxide solution, after the addition was completed, the temperature was controlled at 80°C to 90°C, and the pH was maintained at 8.5 to 9.5 for 3 hours, and then Add sodium hydroxide to increase the pH of the solution to 12-13, raise the temperature to 150°C, and after 1 hour, the reaction is completed and lower the temperature to below 70°C, add citric acid to adjust the pH to neutral, add deionized water to adjust the solid content to 35% .

[0037] The content of dichloroacetic acid was detected to be 45ppm (in the case of untreated residual dichloroacetic acid, calculated by product formula, the theoretical residual amount of dichloroacet...

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Abstract

The invention discloses a method used for processing dichloroacetic acid in cocamidopropyl betaine. According to the method, in processing of cocamidopropyl betaine prepared taking chloroacetic acid as a raw material, the temperature, pH value, and reaction time of hydrolysis of PKO (intermediate cocamidopropyl dimethylamine) with chloroacetic acid are adjusted so as to ensure that other indexes are capable of according with national standard requirements, sodium hydroxide is added in an obtained system without influencing product quality after synthesis reaction of cocamidopropyl betaine, and dichloroacetic acid in the reaction system is removed via controlling reaction temperature, pH value, and reaction time. According to the method, the content of dichloroacetic acid in cocamidopropyl betaine prepared from chloroacetic acid raw material of common quality can be reduced, and no other impurities are introduced.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for processing dichloroacetic acid in cocamidopropyl betaine. Background technique [0002] Amidopropyl betaine is produced by reacting fatty acid or fatty acid anhydride derivatives with N,N-dimethylpropylenediamine to generate intermediate amidopropyl dimethylamine, referred to as PKO, and then use PKO and sodium chloroacetate (chloroacetic acid and hydrogen Sodium oxide synthesis) products of quaternization reaction, such as CAB, LAB. The synthesis of amidopropyl betaine requires the use of chloroacetic acid, which contains a certain amount of by-product dichloroacetic acid. According to the content of the by-product dichloroacetic acid, the price of chloroacetic acid varies greatly, and the by-product dichloroacetic acid can cause serious skin and eye damage, and has a strong exfoliation effect. At present, China's light industry standards have c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/36C07C231/12C07C231/24
CPCC07C231/12C07C231/24C07C233/36
Inventor 陈胜环刘振华张涌
Owner 四川花语精细化工有限公司
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