Preparation method of grease acyl amino acid salt

Abstract

The invention relates to a preparation method of grease acyl amino acid salt. The preparation method comprises the following steps: mixing glycerol and an alkali catalyst, and reacting to prepare a mixture A; and adding monolaurate, grease and amino acid salt into the mixture A, and heating to 90-138 DEG C to carry out ammonia ester exchange reaction. Glycerol can play a role of a dispersing agentso that the problems of non-uniform stirring and difficult stirring in the reaction process are solved; and the product can also react with a base catalyst and is subjected to intermolecular dehydration, and the product can promote the subsequent ammonia ester exchange reaction. Monolaurate is subjected to an ammonia ester reaction with grease and amino acid salt, the effect of a penetration enhancer can be achieved, the difficulty of ammonia ester exchange between grease and amino acid salt is reduced, the reaction process is accelerated, and the conversion rate is increased; the heterogeneous system can be converted into a homogeneous system at a lower temperature, the problems of non-uniform stirring and difficult stirring in the reaction process are improved, and the system is slowlychanged into paste at the later stage of the reaction so that the reaction endpoint is convenient to judge.

Description

technical field [0001] The invention relates to the technical field of surfactants, in particular to a method for preparing an oleoyl amino acid salt. Background technique [0002] At present, the synthetic methods for synthesizing fatty acyl amino acid series surfactants mainly include acid chloride method, fatty acid anhydride method, fatty cyanide hydrolysis method, enzymatic method, etc., but the industrial application is mainly acid chloride method. lead to hindered industrial application. The acid chloride method is also known as the Schotten-Baumann method, that is, a condensation reaction occurs with a fatty acid chloride and an amino acid salt solution in an organic solvent / water mixed phase under the action of a basic catalyst and an acid binding agent. The production process of this method is relatively simple and the source of raw materials is relatively stable, but there are still many disadvantages, such as: the process of synthesizing fatty acid chloride from...

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Problems solved by technology

[0004] The prior art discloses a technical scheme for producing N-fatty acylamino acid sodium by reacting fatty acid methyl ester and amino acid sodium under catalyst conditions, but during the reaction process, due to the lack of solvent, the viscosity of the system in the middle and later stages is very high, requiring relatively high The temperature can maintain the fluidity of the system, resulting in poor color of the obtained product

[0005] Or utilize fatty acid methyl ester and amino acid sodium to react to produce N-fatty acyl amino acid sodium under catalytic conditions, use potassium oxide and magnesium oxide as catalyzer, the activity of this type of catalyst is not high when catalyzing fatty acid methyl ester and amino acid sodium reaction at low temperature, low yield

[0006] Or utilize fatty acid ester and amino acid compound to synthesize N-fatty acyl amino acid salt in polyalcohol, including fatty acid monoester or glyceride, in glycerin and catalyst calcium oxide and buffer salt, the viscosity of system becomes larger in the late stage of reaction, and product The hardening temperature is higher, the reaction is uneven, and the color of the obtained product is also poor

[0007] Or use various oils and amino acid salts, base metal oxides and 4A zeolite as a carrier to form a catalyst, and react under high temperature conditions. The temperature requirement is relatively high at 160 degrees. It is extremely difficult to stir in the later stage, and the obtained product has a high color. And more by-products

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