Preparation method of chitin

A technology of chitosan and mycelium, which is applied in the field of extraction and preparation of chitosan, can solve the problems of spoilage, occupying a large space, and harming the health of production workers, and achieves the extraction of pure products, reliable principles and simple process steps. Effect

Inactive Publication Date: 2007-02-14
QINGDAO UNIV OF SCI & TECH
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  • Summary
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Problems solved by technology

The exhausted waste mycelium not only takes up a lot of space, but also decays and deteriorates over time, emitting an unpleasant smell, which brings great harm to the surrounding environment and the health of production workers.

Method used

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Embodiment Construction

[0017] Take by weighing 500 grams of weight through the pretreated itaconic acid waste mycelium, process at 80°C with 10% dilute alkali (sodium hydroxide or potassium hydroxide), solid-to-liquid ratio (weight percent, below all same) at a ratio of 1:10 for 6 hours, and then filtered (or centrifuged) for separation. Repeat the processing once again by the same operation method and condition. Wash the mycelium solid to neutral, filter (or centrifuge) and separate, and the filter cake is treated with 50% concentrated alkali (sodium hydroxide or potassium hydroxide), the temperature is 90°C, the solid-liquid ratio is 1:20, and the time is 8 hours, then filter (or centrifuge) to separate. Wash the filter cake with water until neutral, filter (or centrifuge) and separate. Dip the filter cake with 10% dilute acid (hydrochloric acid, nitric acid or acetic acid, formic acid) at 90°C for 15 hours, and the solid-to-liquid ratio is 1:20. Filter (or centrifuge) to separate. The obtaine...

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Abstract

The process of extracting chitosan from the waste Aspergillus terreus mycelium from itaconic acid producing process includes: pre-treating to eliminate impurity and water from the waste Aspergillus terreus mycelium, eliminating protein with dilute alkali solution at controlled temperature to obtain solid mycelium and water washing to neutrality, treating with concentrated alkali solution at controlled temperature to eliminate acetyl radical and water washing to neutrality, dissolving the neutral mycelium in dilute acid solution at controlled temperature, time and solid/liquid ratio to obtain clear solution, decolorizing with hydrogen peroxide at controlled temperature, regulating the pH value of the clear solution with alkali and separating out precipitate, dewatering the precipitate with organic solvent, and drying to obtain chitosan product. The present invention has simple technological process, high purity of the product, low power consumption and no pollution.

Description

Technical field: [0001] The invention relates to a method for extracting and preparing chitosan from waste aspergillus terreus mycelia in the production process of itaconic acid. technical background: [0002] Chitin, also known as chitin and chitin, is widely found in the shells of crustaceans such as crabs and shrimps, the epidermis of various insects, the bones and shells of molluscs such as squid and shellfish, and the cell walls of mushrooms and fungi. Chitin is the second natural resource next to cellulose, and it is also the largest nitrogen-containing natural organic compound (followed by protein) on the earth. Chitosan is obtained by deacetylation of chitin and is the only alkaline polysaccharide in nature. Because chitin and chitosan have many excellent properties such as physiological adaptability, complete decomposability, multifunctional reactivity, three-dimensional structure and chirality, renewability and hydrophilicity, etc., it has attracted the attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
Inventor 范金石徐桂云李高宁陶京平
Owner QINGDAO UNIV OF SCI & TECH
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