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Production of chitin chloride

A technology of chitosan hydrochloride and hydrochloric acid, which is applied in the field of preparing uniformly protonated and fully water-soluble chitosan hydrochloride powder, can solve problems affecting the scope of use, and achieve low cost, mild reaction conditions, and simple process Effect

Inactive Publication Date: 2010-07-28
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this point is not involved in the reported methods, and the pH value of the fully dissolved aqueous solution of the obtained product is generally less than 4, most of which are less than 3, which seriously affects its scope of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 2: getting the degree of deacetylation is that 85% chitosan 50g and acetone and concentration are 24% (w / w) hydrochloric acid with volume ratio (v / v) as 2: 1 mixes and makes solution by mass volume ratio Mix at a ratio of 1:1.7 (w / v), stir evenly at room temperature, then react at 45°C for 5 hours, and finally simply dry to obtain a chitosan hydrochloride powder product. The pH value of the 1% aqueous solution of this product is 5.8 at 20°C.

Embodiment 2

[0013] Embodiment 3: getting deacetylation degree is that 75% chitosan 50g and propanol and concentration are the hydrochloric acid that is 24% (w / w) with volume ratio (v / v) and is the solution that mixes 3: 1 by mass volume ratio Mix at a ratio of 1:2 (w / v), stir evenly at room temperature, react at 30° C. for 7 hours, and finally vacuum-dry to obtain chitosan hydrochloride powder product. The 1% aqueous solution of this product has a pH value of 5.3 at 20°C.

Embodiment 3

[0014] Embodiment 4: getting deacetylation degree is that 95% chitosan 50g and isopropanol and concentration are 33% (w / w) hydrochloric acid with volume ratio (v / v) as the solution that 1: 1 mixes by mass volume Mix at a ratio of 1:1 (w / v), stir evenly at room temperature, then react at 78°C for 2 hours, and finally dry in vacuum to obtain a chitosan hydrochloride powder product. The product's 1% aqueous solution has a pH value of 4.2 at 20°C.

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PUM

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Abstract

Production of soluble chitose chloride is carried out by mixing chlorhydric acid 6-36wt% with organic solvent in proportion of 1:0-4 into mixed solution, mixing it with chitose powders with deacetylating degree 60-100% in proportion of 1:2.5-1:1, agitating, laying aside at 0-80degree for 0-8hrs, and drying to obtain the final product. It's simple, cheap and efficient; it has gentle reactive condition and friendly environment and can be used in food, medicinal, chemical and agricultural industries.

Description

technical field [0001] The invention relates to a method for preparing chitosan hydrochloride, in particular to a method for preparing uniformly protonated and fully water-soluble chitosan hydrochloride powder. Background technique [0002] Chitosan is an alkaline polysaccharide obtained after partial deacetylation of chitin. Because the polysaccharide molecule contains amino groups, it has many excellent properties such as biocompatibility, biodegradability, non-cytotoxicity, antibacterial, Lowering cholesterol and blood lipids, enhancing immune function, anti-tumor activity and adsorption properties, suitable for use as functional materials and medical materials. Many properties of chitosan are closely related to its water solubility and positive charge. This can be achieved by reacting chitosan with aqueous solutions of organic or inorganic acids to form a salt. Chitosan hydrochloride is an important member of these salts. It can be used as a flocculant for sewage treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08
Inventor 杨建红蔡俊杜予民
Owner WUHAN UNIV
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