Method for preparation of high-purity fatty acyl amino acid salt

Abstract

The invention discloses a method for preparation of a high-purity fatty acyl amino acid salt, wherein the method includes the following steps: a) carrying out a reaction of amino acid with fatty acyl chloride, neutralizing released hydrochloric acid with an alkaline substance, and generating a fatty acyl amino acid salt crude product; b) adding a solvent to the crude product, heating to dissolve and dispersing to obtain a solution, and adjusting the pH value of the solution; c) placing the solution on an ultrasonic apparatus, slowly cooling to 20-25 DEG C, carrying out ultrasonic crystallization of the solution for the first time, and separating through reduced pressure suction filtration, to obtain a filter cake for standby application; and d) adding a solvent to the filter cake obtained in the former step, heating to dissolve and dispersing to obtain a solution, carrying out ultrasonic crystallization for the second time, separating through reduced pressure suction filtration, to obtain a filter cake, carrying out vacuum drying of the filter cake, and thus obtaining the high-purity fatty acyl amino acid salt finished product. The high-purity fatty acyl amino acid salt having less impurity residue, good crystal shape and uniform granularity can be obtained by using the method; the method has the advantages of reasonable process, easy operation, high production efficiency, good production preparation reproducibility, and stable product quality.

Description

technical field [0001] The invention relates to a preparation method of high-purity fatty acyl amino acid salt. Background technique [0002] As a mild anionic surfactant, fatty acyl amino acid salt is widely used in the field of daily chemicals, especially in detergent formulations. However, in recent years, people have higher and higher requirements for the irritation of detergents, especially facial cleansers. , Shampoo, shower gel, toothpaste and other daily chemical products that are in direct contact with the human body, people usually require rich foam, rinsing, soft skin cleaning, no irritation or little irritation to the skin, the skin will not dry after frequent use, and it must be non-toxic. Tears (may also be expressed as acute eye irritation with little or no irritation). At present, due to the high content of impurities in fatty acyl amino acids / salts (mainly small molecular amines, iron ions, chromium ions, etc.), the irritation of raw material residues or si...

AI Technical Summary

Problems solved by technology

In summary, the preparation of fatty acyl amino acid salts in the prior art mainly has the following problems: (1) the crystallization effect is not good in the crystallization process, and it is easy to form large agglomerates to wrap impurities. There are problems affecting the mildness and performance of the product; (2) It is easy to form a viscous paste during the crystallization process, the crystal form is not good, the separation is difficult, the separation effect is not good, and the separation efficiency is low; (3) fatty acyl amino acid / salt The problem that the yield of fatty acyl amino acid / salt active substance is reduced due to the inability of the active substance to be completely crystallized and miscible in the filtrate; (4) The corrosion of the acidified waste liquid in the acidification process and the environmental protection pressure on the equipment

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