Method for preparing high relative molecular mass chitin and chitosan, and comprehensive utilization

A technology of relative molecular mass and chitin, which is applied in the preparation of chitosan and the field of high relative molecular mass chitin, can solve the problems of high energy consumption and serious environmental pollution of waste, achieve low energy consumption, improve economic benefits, Environmentally friendly effect

Inactive Publication Date: 2003-03-12
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic process of HCl decalcification has high energy consumption, and the waste has serious environmental pollution.

Method used

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  • Method for preparing high relative molecular mass chitin and chitosan, and comprehensive utilization
  • Method for preparing high relative molecular mass chitin and chitosan, and comprehensive utilization

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: Preparation and Comprehensive Utilization of High Relative Molecular Mass Chitin

[0033] Use fresh shrimp and crab shells as raw materials, wash them, shake them dry, blow dry them at about 60°C for 5-8 hours, and then crush them into about 5×5mm 2 Fragments of different sizes are passed through a 40-mesh sieve. The sieved shrimp and crab shells are put into a 40-mesh nylon mesh bag, soaked in 5% NaOH solution at room temperature for 24 hours, filtered, dried, rinsed with water until neutral, and then dried to complete the alkali treatment deproteinization process . The sieved fine powder is used as concentrate feed, which is the first by-product of this process. The filtrate was adjusted to pH = 5-6 with concentrated HCl to precipitate the protein, the precipitate was separated, washed, and dried by air at about 60°C to obtain the protein. This is the second by-product.

[0034] Dissolve EDTA in NaOH solution to obtain a saturated solution (pH = 7), imm...

Embodiment 2

[0037] Embodiment two: the preparation of high relative molecular mass chitosan:

[0038] Utilize the chitin that the technique described in embodiment one makes for the production of chitosan, after finishing the alkali treatment deproteinization operation of embodiment one and the EDTA treatment decalcification operation, without drying this operation, as figure 1 As shown, add 45% NaOH solution to the wet material, treat it at about 62°C for 15 hours, then filter, then use a new 45% NaOH solution, treat it at about 62°C for 15 hours, filter, wash with water until it is neutral, and dry it. Blow drying at about 60°C to obtain a white chitosan product with a degree of deacetylation DD > 85%.

[0039] The filtrate is used for recycling, and the filtrate filtered for the first time is recycled for 3-4 times, and then prepared into a concentration of 5% for deproteinization treatment in the process of preparing chitin. The filtrate filtered for the second time is recycled twice...

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Abstract

A process for preparing the chitin or chitosan with high relative molecular mass is characterized by that EDTA instead of HCl is used for decalficiation, resulting in no damage to molecular chain and higher yield increased by 10% or more. Its by-products and rejected substance are all recovered for lower cost.

Description

Technical field: [0001] The invention belongs to the preparation and processing of organic macromolecular compounds, in particular to a preparation method and comprehensive utilization of high relative molecular weight chitin and chitosan. Background technique: [0002] The preparation of chitin generally adopts HCl decalcification and NaOH deproteinization, both of which can damage the molecular chain of chitin. Chitin is a high-molecular polymer, which will degrade in the process of acid-base treatment. Therefore, the quality of the product varies greatly due to the different production process conditions. Among them, the hydrochloric acid treatment for decalcification has the greatest impact on the molecular chain of chitin, while the alkali treatment has almost negligible influence compared with the acid treatment. The basic process of decalcification using HCl has high energy consumption, and the waste pollutes the environment seriously. Invention content: [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 杨丹刘毅何兰珍康信煌
Owner GUANGDONG OCEAN UNIVERSITY
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