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

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...