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Method for treating waste liquid of chitin and chitosan production

A technology of chitosan and chitin, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as practical limitations, waste of washing wastewater pollution, etc. Effects of Environmental Pollution

Inactive Publication Date: 2008-05-14
大连利健甲壳素股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this end product contains a large amount of calcium sulfate and chloride, which may limit the practicality. In addition, the pollution and waste of washing wastewater have not been treated.
Patent CN1526739 provides a process for deproteinizing with protease, recovering protein, and reducing wastewater discharge, but acidic wastewater and washing wastewater still need special treatment for discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 200g snow crab shell (I) and immerse in 1500mL 6% NaOH solution, heat at 90-100°C for 4 hours, separate deproteinized shell material (I) and deproteinized lye (I).

[0019] Wash the deproteinized shell material (I) with water until neutral, wash with 1200mL water each time for a total of 5 times, and keep the washing water for later use. Using the first washing water and relatively concentrated lye, adjust the deproteinized lye (I) to 1500mL, and NaOH6% as the deproteinized lye (II).

[0020] Weigh 200g of snow crab shell (II), immerse in deproteinized lye (II), heat at 90-100°C for 4 hours, separate deproteinized shell material (II) and deproteinized lye (II).

[0021] With each washing water of the deproteinized shell material (I), the deproteinized shell material (II) is continuously countercurrently washed, that is, the second washing water of the shell material (I) is used as the first washing water of the shell material (II) wash water for the first time, a...

Embodiment 2

[0025] The deproteinized shell material (I) was decalcified with 1500 mL of 6% dilute nitric acid intermittently, kept at room temperature for 8 hours, and the crude chitin (I) and decalcified acid solution (I) were separated.

[0026] The separated chitin (I) was washed with water until neutral, each time with 1200 mL of water, for a total of 4 washes. Reserve the wash water separately for later use. Adjust the decalcified acid solution (I) to 1500mL with the first washing water and relatively concentrated nitric acid, and use it as the decalcified acid solution (II) with a nitric acid content of 6%, and use it to decalcify the deproteinized shell material (II), at room temperature for 8 Hour. Separate crude chitin (II) and decalcified acid solution (II).

[0027] Use the washing water of crude chitin (I) to carry out continuous countercurrent washing of crude chitin (II), that is, the second washing water of crude chitin (I) is used as the first washing of crude chitin (II...

Embodiment 3

[0030] Weigh 50g of dried chitin, immerse in 1000g of 45% NaOH solution, heat and keep at 95±5°C, and carry out deacetylation reaction for 8 hours. Separate crude chitosan and concentrated lye. Concentrated lye is reserved for reuse.

[0031] Wash the crude chitosan to neutrality, wash 7 times with 800mL of water each time, keep the washing water for each time respectively, and use it for continuous countercurrent washing of the next batch of crude chitosan. The first and second washing water (NaOH>5%) can be used to prepare dilute alkali for deproteinization.

[0032] The crude chitosan is 38.8g of chitosan after washing and drying.

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PUM

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Abstract

The invention provides a novel technology to eliminate environmental pollution by resourceful treatment of the waste liquors of chitin and chitosan. First, the protein of shrimp and crab shells is removed by dilute alkali liquor and the dilute alkali liquor is used for two to four times; secondly, the waste alkali liquor after deporteinization is neutralized by acid with the fertilizers of N, P, K in proper quantity added to prepare protein peptide water flush fertilizer; thirdly, the deproteinized shell is de-calcified with 5 to 10% dilute nitric acid solution and the nitric acid solution is used for two to four times; fourthly, the waste acid liquor containing calcium nitrate is used to extract calcium nitrate tetrahydrate or directly used as fast-released calcium fertilizer; at the same time, the technology of continuous countercurrent washing is adopted to rinse the deproteinized, decalcified and de-acetylate materials so as to realize the ''zero-discharge'' of wastewater.

Description

technical field [0001] The invention belongs to the technical field of chitin polysaccharide production. At the same time, it involves the comprehensive treatment of production waste liquid, the treatment of waste liquid to produce nitrogen, phosphorus, potassium and peptide fertilization, and the extraction of calcium nitrate tetrahydrate or direct use as quick-acting calcium fertilizer. Background technique [0002] Chitin and chitosan are nitrogen-containing natural polymer polysaccharides widely present in the shells of shrimps, crabs, and insects, and in the cell walls of mushrooms, fungi, and bacteria. Because this biological material is safe and non-toxic, has various excellent physiological functions, good biocompatibility and biodegradability, it has a wide range of uses in medicine, food, daily chemicals, textiles and environmental protection. [0003] The existing production of chitin and chitosan usually uses shrimp and crab shells as raw materials, and undergoe...

Claims

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Application Information

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IPC IPC(8): C02F9/04C05F7/00C05C5/04
CPCY02A40/20
Inventor 张英伟刘宗明
Owner 大连利健甲壳素股份有限公司
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