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Method for preparing β-alanine amphoteric surfactant

A technology of surfactants and allanine, which is applied in the preparation of cyanide reaction, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problems of methanol by-product residues, achieve high product purity, reduce applications, and improve the state Effect

Active Publication Date: 2017-01-04
SHANGHAI FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This process has the problem of residual methanol by-products. If high-purity products need to be obtained, post-processing is required for purification

Method used

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  • Method for preparing β-alanine amphoteric surfactant
  • Method for preparing β-alanine amphoteric surfactant
  • Method for preparing β-alanine amphoteric surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 250mL four-necked flask equipped with a condenser, a thermometer, and a stirrer, add 94.8g of dodecyl primary amine and 4.0g of water, stir and raise the temperature. When the reaction temperature reaches 60°C, slowly pass 55.2g of acrylic acid through the addition funnel Add it into the reactor, control the time within 30 minutes, stir and react for 2 hours at a temperature of 60° C. to obtain a viscous liquid, and the conversion rate of primary dodecylamine is 73.0%. Use sodium hydroxide to neutralize to a pH value of 7.5, which is a β-alanine amphoteric surfactant product.

[0038] Gained β-alanine amphoteric surfactant HNMR spectrum and IR spectrum see figure 1 with figure 2 .

Embodiment 2

[0040] In a 250mL four-necked flask equipped with a condenser, a thermometer and a stirrer, add 31.6g of dodecyl primary amine and 75.0g of water, stir and raise the temperature. When the temperature reaches 60°C, slowly add 24.5g of acrylic acid through the addition funnel Into the reactor, the control time is within 30 minutes. When the temperature is 90° C., the reaction is stirred for 12.5 hours to obtain a light yellow transparent liquid, and the conversion rate of dodecyl primary amine is 97.0%. Use sodium carbonate to neutralize to a pH value of 7.9, which is the final product.

Embodiment 3

[0042] In a 250mL four-necked flask equipped with a condenser, a thermometer and a stirrer, add 31.6g of dodecyl primary amine and 75.0g of water, stir and raise the temperature. When the temperature reaches 60°C, slowly add 18.4g of acrylic acid through the addition funnel Into the reactor, the control time is within 30 minutes, and when the temperature is 100° C., the reaction is stirred for 8 hours to obtain a yellow transparent liquid, and the conversion rate of dodecyl primary amine is 99.5%. Use monoethanolamine to neutralize to a pH value of 7.7, which is the final product.

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Abstract

The method for preparing the β-alanine amphoteric surfactant of the present invention comprises: aliphatic amine and acrylate with a molar ratio of 1:1 to 1:2 react in a protic solvent at a temperature of 60°C to 100°C After 2-15 hours, the product is yellow or colorless transparent liquid; the product is neutralized to a pH value of 7-9 with a neutralizing agent to obtain the β-alanine amphoteric surfactant. Using aliphatic amines and acrylates as raw materials to prepare β-alanine amphoteric surfactants in protic solvents reduces the application of toxic and harmful raw materials; protic solvents not only play a role in improving the state in the reaction, but also have a certain catalytic effect. The effect is conducive to the progress of the reaction, shortening the reaction time and improving the conversion rate. The invention is an atom-economical reaction without toxic and harmful by-products, does not require subsequent purification treatment, and has high product purity.

Description

technical field [0001] The invention relates to a preparation method of an amino acid surfactant, in particular to a preparation method of a β-alanine amphoteric surfactant. Background technique [0002] N-Alkyl-β-alanine amphoteric surfactant is a mild, non-irritating green surfactant, which has medium degreasing power, good foam performance, acid and alkali resistance, and has good compatibility with other surfactants. Capacitive, and easy to biodegrade, so it has a wide range of applications in the field of personal washing and cosmetics, heavy-duty cleaners, antistatic, etc. [0003] German patent (DE102005044090A1) utilizes fatty amine and acrylic acid derivatives (acrylonitrile, methyl acrylate, etc.) to react at 20-80°C under the catalysis of water to prepare N-alkyl-β-alanine amphoteric surfactant. The raw materials used in this method are all highly toxic, and have certain dangers in actual operation, and have relatively high requirements for operators and equipmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C229/12C07C227/18C07C213/00C07C215/08C07C215/12B01F17/28C09K23/28
Inventor 王丰收张燕山张威马丽娜杨庆利董万田刘兵张高飞李文迪徐福利
Owner SHANGHAI FINE CHEM CO LTD