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Method for preparing high-viscosity and high-deacetylation-degree chitosan

A technology of high deacetylation and chitosan, applied in the field of chitosan, can solve the problems of low degree of deacetylation, low viscosity of chitosan, can not fully meet the needs of use, etc., and achieves easy industrialization, low cost and good economy. The effect of benefits and social effects

Inactive Publication Date: 2013-10-30
YANGZHOU HONGXIN BIOLOGICAL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing chitosan preparation method, the prepared chitosan has low viscosity and low degree of deacetylation, which cannot fully meet the use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put 2500L of sodium hydroxide solution with a concentration of 50% g / g into a 3000L glass-lined reactor, add 500kg of chitin into it, seal the reactor, turn on the steam to raise the temperature to 90°C, and keep the pressure in the reactor within 0.2Mpa. 90~100℃ for 6 hours. After the heat preservation is over, drain the lye, pour in purified water and start stirring for washing, repeat washing for more than three times until the pH reaches 7, and discharge. Then dry it to obtain high-viscosity chitosan. After testing, the degree of deacetylation can reach more than 95%, and the viscosity of chitosan can reach 2000mpa.

Embodiment 2

[0014] Put 2400L of sodium hydroxide solution with a concentration of 45% g / g into a 3000L glass-lined reactor, add 400kg of chitin into it, seal the reactor, turn on the steam to raise the temperature to 90°C, and keep the pressure in the reactor within 0.2Mpa. 90~100℃ for 5 hours. After the heat preservation is over, drain the lye, pour in purified water and start stirring for washing, repeat washing for more than three times until the pH reaches 7, and discharge. Then dry it to obtain high-viscosity chitosan. After testing, the degree of deacetylation can reach more than 95%, and the viscosity of chitosan can reach 2000mpa.

Embodiment 3

[0016] Put 2000L of sodium hydroxide solution with a concentration of 55%g / g into a 3000L glass-lined reactor, add 500kg of chitin into it, seal the reactor, turn on the steam and raise the temperature to 90°C, keep the pressure in the reactor within 0.2Mpa, 90 ~ 100 ℃ insulation 7h. After the heat preservation is over, drain the lye, pour in purified water and start stirring for washing, repeat washing for more than three times until the pH reaches 7, and discharge. Then dry it to obtain high-viscosity chitosan. After testing, the degree of deacetylation can reach more than 95%, and the viscosity of chitosan can reach 2000mpa.

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PUM

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Abstract

The invention discloses a method for preparing high-viscosity and high-deacetylation-degree chitosan. The method is characterized by comprising the following steps of: adding sodium hydroxide solution and chitin into a reaction kettle, controlling the temperature at 90-100 DEG C, controlling the temperature at 0.1-2 Mpa, and reacting for 5-7 hours; and removing an alkali liquid, adding purified water to wash for several times until the pH is 7, and drying to obtain the high-viscosity and high-deacetylation-degree chitosan. Compared with the prior art, the method for preparing high-viscosity and high-deacetylation-degree chitosan has the advantages that the cost is low, the steps are few, the industrialization is liable, the deacetylation degree of a prepared product can reach above 95%, and the viscosity of the prepared product can reach 2000 mpa; and the practicality is good, and good economic benefits and social effects can be generated.

Description

technical field [0001] The invention relates to chitosan, in particular to a method for preparing chitosan with high viscosity and high degree of deacetylation. Background technique [0002] Chitosan (chitosan) is obtained by deacetylation of chitin (chitin), which exists widely in nature, and its chemical name is polyglucosamine (1-4)-2-amino-B-D glucose. It is used in medicine, food, chemical industry , Cosmetics, water treatment, metal extraction and recovery, biochemical and biomedical engineering and many other fields have a wide range of applications. In the existing chitosan preparation method, the prepared chitosan has low viscosity and low degree of deacetylation, which cannot fully meet the use requirements. Contents of the invention [0003] Purpose of the invention: for the deficiencies in the prior art, the purpose of the invention is to provide a method for preparing chitosan with high viscosity and high degree of deacetylation, so that it has the advantages...

Claims

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Application Information

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IPC IPC(8): C08B37/08
Inventor 杨生桂
Owner YANGZHOU HONGXIN BIOLOGICAL PRODS