Method for pre-treating chitin raw material

Abstract

The invention discloses a method for pre-treating a chitin raw material, which is characterized by comprising the following steps: 1), filling the chitin raw material in a gas explosion expansion tank and injecting a gas explosion expansion medium which may be vapor, water, aqueous ammonia or ethanol; and 2), relieving the pressure in the gas explosion expansion tank instantaneously and spraying the chitin raw material into a normal pressure container to obtain a chitin concentrate. Compared with the prior art, the method has the advantages of: 1), loosening the compact crystal structure of the chitin and increasing the exposure of active groups; 2), increasing the activity of chemical reaction to smoothly perform a main chemical reaction and increase the reaction speed; and 3), performing the main chemical reaction at a low temperature, inhibiting side reactions and improving product yield.

Description

technical field [0001] The invention relates to a pretreatment method for chitin raw materials, in particular to a method for processing chitin raw materials by an air explosion puffing method. Background technique [0002] Chitin, also known as chitin, chitin, etc., is a polysaccharide connected by N-acetyl-2 amino-D-glucose in the form of β-1,4 glycosidic bonds, and is a natural linear polymer compound. Its chemical name is (1,4)-2-acetylamino-2-deoxy-β-D-glucose. [0003] Chitin is divided into α, β, γ three configurations. In the chitin obtained from shrimp shells and crab shells, the α-type chitin accounts for the majority, and its molecular main chains are arranged in an antiparallel manner, with strong hydrogen bonding forces between molecules. In addition, α, β, γ The three configurations of chitin are intertwined, and the dense crystal structure makes it difficult to be chemically modified. For example, when using chitin as raw material to prepare chitin derivati...

AI Technical Summary

Problems solved by technology

[0005] However, before using chitin as raw material to prepare chitin-derived products, chitin is not easy to be chemically modified due to its compact structure.

People naturally think of pretreatment of chitin raw materials, such as mechanical pulverization, ultrasonic treatment, microwave treatment, and ultrasonic treatment and microwave treatment are still in the laboratory stage. The method applied to industrial production so far is only mechanical pulverization, but little effect