A kind of preparation method of starch sulfate ammonium salt

Abstract

The invention relates to a preparing method for starch sulphate ammonium salt.The preparing method specifically comprises the steps that in a kneading machine, a starch sugar unit is put into sulfamic acid at the mole ratio of the starch sugar unit to sulfamic acid being 1:0.5-1:1.5, and a catalyst is put into the mixture at the mole ratio of the starch sugar unit to the catalyst being 1:0.25-1:1.5; the mixture is mixed and heated to 100-150 DEG C, starch is put into the mixture after the mixture is completely melt at the mole ratio of the starch sugar unit to starch being 1:1, a reaction is carried out at a constant temperature until no water vapor is generated in a reaction kettle, and then the mixture is cooled to the room temperature; ammonium hydroxide is used for neutralizing acid remaining in the reaction system to reach the pH of 8-10, ethyl alcohol with the purity of 95% is added to separate precipitate out, centrifugal separation is carried out at the centrifugal speed of 3500-9000 turns / min, drying is carried out at 40-50 DEG C, and a starch sulphate ammonium salt product is obtained.By means of the preparing method, the sulfonation degree of the product is increased, strong degradation on starch and the strong corrosion effect on equipment can be avoided by means of the adopted raw materials, and the preparing method has the advantages that operation is convenient, production cost is reduced while environment pollution is relieved, and the raw material cost and the requirement for equipment are low.

Description

technical field [0001] The invention belongs to the technical field of preparation of modified starch, in particular to a starch sulfate ammonium salt and a preparation method thereof. Background technique [0002] Starch sulfate, also known as sulfonated starch, is the introduction of sulfonic acid groups -SO 3 A starch derivative obtained from H. Starch sulfate has a variety of characteristics different from other modified starches, and has been well used in many fields, especially in food, medicine and other fields. For example, the hydrosol formed by starch sulfate still shows good stability below the freezing temperature, and can be used as a thickener for frozen foods and certain pharmaceuticals. The most interesting property of starch sulfate is the biological activity discovered in recent years. For example, some starch sulfates have a strong affinity for proteins and have a heparin-like anticoagulant effect, which can be used as a cheap substitute for natural hep...

AI Technical Summary

Problems solved by technology

The biggest disadvantages of these three methods are: the strong corrosiveness or toxicity of the sulfonating agent; the serious degradation of starch molecules and complicated post-treatment;

Although the maximum degree of substitution of the product sulfonic acid group has been improved by these two methods, the cost of the sulfonating agent and solvent used is all expensive, and the toxicity of the pyridine used is also very high.