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Method for refining and purifying N-acylamino acid or salt thereof

An acylamino acid, refining and purifying technology, which is applied in the refining field of amino acid surfactants, can solve problems such as poor stratification, and achieve the effects of improving desalination effect, wide range of use, and improving desalination effect.

Active Publication Date: 2013-11-27
NANJING HUASHI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for refining and purifying N-acyl amino acids and their salts. The method of the present invention utilizes the method of crystallization and demulsification to eliminate the water wrapped in the material, solve the technical problem of poor layering, and can significantly improve the desalination effect. It is an improved purification method of alkanoyl amino acid hydrochloride, water separation and desalination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Sodium Cocoyl Glycinate Refining

[0023] Add 500Kg of cocoyl chloride dropwise to 2100Kg sodium glycinate aqueous solution (sodium glycinate content 12%, pH value 9.0, temperature 20°C), use 30% sodium hydroxide solution to maintain the pH value at 9-10, after 3 hours after the reaction , the salt content in the material is 5.5%.

[0024] Add hydrochloric acid to acidify, adjust the pH value to 1-2, stir and raise the temperature to 65°C to emulsify the system material, then lower the temperature to 30°C, and the cocoyl glycine in it will become crystallized. Then raise the temperature to 80°C, the crystalline material melts and aggregates, the formed organic phase and water are well separated, and the water layer is separated after standing still, and the water is quickly separated. The material can be directly neutralized with alkali to form a 30% solution, and its salt content is determined to be 0.3%.

[0025]

Embodiment 2

[0026] Example 2 Sodium lauroyl sarcosinate refining

[0027] Sodium lauroyl sarcosinate was prepared according to a method similar to that of Example 1, and the salt content in the material was 5.0%.

[0028] Add sulfuric acid to acidify, adjust the pH value to 1-2, stir and raise the temperature to 80°C to emulsify the system materials, lower the temperature to 40°C, and the lauroyl sarcosine in it will become crystalline. Then raise the temperature to 70°C, the crystalline material melts and aggregates, and the formed organic phase and water have a good layering, and the water layer is separated after standing still, and the water is quickly separated. The material can be directly neutralized with alkali to form a 30% solution, and its salt content is determined to be 0.2%.

[0029]

Embodiment 3

[0030] Example 3 Sodium Cocoyl Glutamate Refining

[0031] Prepare Sodium Cocoyl Glutamate according to a method similar to Example 1, and the salt content in the material is 4.5%.

[0032] Add hydrochloric acid to acidify, adjust the pH value to 1-2, stir and raise the temperature to 60°C to emulsify the system material, then lower the temperature to 35°C, and the cocoyl glutamic acid in it will become crystallized. Then raise the temperature to 95°C, the crystalline material melts and gathers, and the formed organic phase and water are well separated, and the water layer is separated after standing still, and the water is quickly separated. The material can be directly neutralized with alkali to form a 30% solution, and its salt content is determined to be 0.5%.

[0033]

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PUM

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Abstract

The invention relates to a method for refining and purifying N-acylamino acid or salt thereof. The method comprises the following steps of: (1) adding acid to materials, namely the N-acylamino acid or the salt thereof, acidifying till the pH value is less than 2, heating up till the N-acylamino acid is molten, and stirring till the materials are uniformly dispersed or formed into an emulsified state; (2) cooling the materials obtained from the step (1) till the N-acylamino acid is crystallized or solidified, wherein an emulsion system is demulsified because substances which play surface activity roles become solids, and N-acylamino acid crystals are dispersed in water; (3) heating up to melt the N-acylamino acid crystals, forming an organic phase after aggregation, layering with a water phase, and standing to separate out a water layer. The method disclosed by the invention can be used for solving the problem of poor layering by utilizing a crystal demulsification method and can be used for obviously enhancing the desalting effect by thoroughly layering the water phase and the organic phase; according to the method provided by the invention, the refined N-acylamino acid or the salt thereof is low in salt content and less in impurity.

Description

technical field [0001] The invention relates to a method for refining amino acid surfactants, in particular to a method for refining and purifying N-acyl amino acids and their salts, and is an optimized industrial refining method for fatty acyl amino acids and their salts. Background technique [0002] N-acyl amino acids and salts are a class of compounds obtained by acylation of amino acids, usually formed by condensation of fatty acid chlorides and amino acids. These compounds have good surface activity, foaming performance, cleaning performance and mildness, and are widely used in cosmetics , personal cleaning and care products, and in other fields such as food additives, metal processing, ore flotation, oil extraction, and agriculture, biological products and pharmaceutical preparations are also widely used. [0003] The production process of N-acyl amino acids and salts is usually to drop fatty acid chlorides into amino acid solutions under alkaline conditions for conde...

Claims

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Application Information

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IPC IPC(8): C07C233/47C07C231/02C07C231/24
Inventor 汪昌国
Owner NANJING HUASHI NEW MATERIAL
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