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Method for preparing calcium carbonate-chitin composite powder by using crab shells as raw material and application of method

A composite powder, calcium carbonate technology, applied in chemical instruments and methods, prostheses, other chemical processes, etc., can solve the problems of complex operation process, achieve simple process, low equipment investment and energy consumption, and broad application prospects. Effect

Inactive Publication Date: 2017-03-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of method can better realize the comprehensive utilization of crab shell resources, but the operation process is relatively complicated

Method used

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  • Method for preparing calcium carbonate-chitin composite powder by using crab shells as raw material and application of method
  • Method for preparing calcium carbonate-chitin composite powder by using crab shells as raw material and application of method
  • Method for preparing calcium carbonate-chitin composite powder by using crab shells as raw material and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Use flotation to remove the residual meat on the shell of Chinese mitten crab, drum dry, and pulverize; then the powder is subjected to follow-up treatment in sequence;

[0032] 2) Mix 1 mass part of crab shell powder obtained by coarse crushing with 1 mass part of 10% sodium hydroxide solution, stir at 100°C for 0.5h, remove protein and fat, press filter, and wash with water until neutral;

[0033] 3) Add 1 mass part of hydrogen peroxide solution with a mass concentration of 5% to the powder, stir at 100°C for 0.5h to decolorize the powder, press filter, wash with water until the filtrate is colorless, add water and stir at high speed to obtain slurry;

[0034] 4) wet grinding in a vertical sand mill, press filtration, drum drying, and crushing to obtain calcium carbonate-chitin composite powder.

[0035] From figure 1 The diffraction peaks of calcium carbonate and chitin can be seen in the X-ray diffraction pattern of image 3 From the particle size distributio...

Embodiment 2

[0037] 1) Use the flotation method to remove the residual meat on the crab shell of the stone crab, drum dry, and pulverize; then the powder is subjected to subsequent processing in sequence;

[0038] 2) Mix 1 mass part of coarsely crushed crab shell powder with 10 mass parts of a 1% potassium hydroxide solution, stir at room temperature for 24 hours, remove protein and fat, press filter, and wash with water until neutral ;

[0039] 3) Add 10 parts by mass of potassium permanganate solution with a mass concentration of 0.1% to the powder, stir at room temperature for 24 hours to decolorize the powder, press filter, wash with water until the filtrate is colorless, add water and stir at a high speed to obtain the powder pulp;

[0040] 4) Wet grinding in a horizontal sand mill, press filtration, drum drying, and crushing to obtain calcium carbonate-chitin composite powder.

[0041] From figure 2 The diffraction peaks of calcium carbonate and chitin can be seen in the X-ray di...

Embodiment 3

[0043] 1) Use flotation to remove the residual meat on the crab shell of Portunus trituberculatus, drum dry, and pulverize; then the powder is subjected to follow-up treatment in sequence;

[0044] 2) Mix 1 mass part of coarsely crushed crab shell powder with 5 mass parts of a 5% calcium hydroxide solution, stir at 50°C for 10 h, remove protein and fat, press filter, and wash with water until medium sex;

[0045] 3) Add 5 parts by mass of sodium hypochlorite solution with a mass concentration of 2% to the powder, stir at 50° C. for 10 h, decolorize the powder, press filter, wash with water until the filtrate is colorless, add water and stir at a high speed to obtain a slurry;

[0046] 4) Place in a stirring mill for wet grinding, press filter, drum dry, and pulverize to obtain calcium carbonate-chitin composite powder.

[0047] From Figure 5 From the particle size distribution curve, it can be seen that the average particle size of the sample is about 12 μm, and the particl...

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Abstract

The invention discloses a method for preparing calcium carbonate-chitin composite powder by using crab shells as a raw material and application of the method. The preparation method comprises the following steps: (1) removing meat on the crab shells, drying by a drum and pulverizing; (2) removing protein and fat in powder with 1-10% of alkali liquor; (3) decolorizing the powder by using an oxidizing agent solution with mass concentration of 0.1-5%; and (4) grinding by a wet process, carrying out filter pressing, drying by the drum and polarizing to obtain the calcium carbonate-chitin composite powder. The sources of raw materials are extensive, the process is simple, operation conditions are gentle, the natural composite structure of calcium carbonate-chitin in the crab shells is kept in the prepared powder, and respective advantages of calcium carbonate and chitin are combined, particle size distribution is even, the whiteness is high, and the calcium carbonate-chitin composite powder can be used as packing of plastic and rubber, an adsorbent, a flocculating agent, an antibacterial agent, a catalyst or a tissue engineering material.

Description

technical field [0001] The invention relates to the field of resource utilization of crab shells, in particular to a method for preparing calcium carbonate-chitin composite powder using crab shells as a raw material and its application. Background technique [0002] The main components of crab shells are calcium carbonate, chitin, protein, and a small amount of pigments and fatty acids. Among them, calcium carbonate content is about 50%, protein is about 30%, and chitin is about 20%. Chitin in the shell is fibrous and intertwined into a random network structure; the protein uses chitin fibers as the skeleton, and combines with chitin to form proteoglycans; calcium carbonate has a honeycomb porous crystal structure, filled between chitin and chitin In the interstices between layers of protein. [0003] At present, the utilization of crab shells is mostly the extraction of chitin, such as the patent "Extraction of chitin from shrimp and crab shells", patent application numbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/08C08K3/26C08L101/00C08L21/00C08B37/08B01J20/24B01J20/30A61L27/02A61L27/20B01J31/26
CPCC08K3/26A61L27/025A61L27/20B01J20/24B01J31/26C08B37/0003C08B37/003C08K2003/265C08L21/00C08L101/00C08L5/08
Inventor 葛柳钦夏枚生周佑洲范能韩玮杨文叶张维睿叶瑛
Owner ZHEJIANG UNIV
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