Clean chitosan production technology

A clean production and chitin technology, applied in the preparation method of peptides, organic chemistry, peptides, etc., can solve the problems of environmental damage of chitin production technology, extensive process wastewater treatment methods, and non-standard discharge. It is of great significance to achieve environmental protection. The effect of reducing the amount of acid foam and improving economic benefits

Active Publication Date: 2013-05-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] To sum up, the existing chitin production technology is seriously destructive to the environment, the treatment method of process wastewater is extensive, the treatment cost is

Method used

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  • Clean chitosan production technology

Examples

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Effect test

Embodiment 1

[0026]Using 100Kg of shrimp shells and shrimp processing scraps as raw materials, without coarse crushing, they are directly transported to a high-density steam flash explosion (HDSFE) device, pressurized to 10MPa by steam, and then 0.0875s instantaneous pressure release flash explosion; after flash explosion Transfer the raw materials to a 316L stainless steel reaction tank, soak in 2 times (w / w) tap water, heat up to 60°C, stir and adjust the pH to 6.5, add 30g of neutral protease (100Kg×30%×1‰), and stir for 12 hours , inactivate the enzyme at 85°C, coarsely filter, pass the filtrate through NF or RO membrane to concentrate the proteolysis solution to 20%, and spray dry to obtain about 25Kg hydrolyzed protein powder. Reheat the filter residue with 7% NaOH solution to 100°C, soak for 1 hour with gas blowing, discard the waste caustic soda, wash the residue with water until it is neutral, then soak it with 6% hydrochloric acid for 12 hours with blowing gas at room temperature,...

Embodiment 2

[0029] 100Kg of Alaskan cod crab shells are used as raw material, after being coarsely crushed, it is transported to the HDSFE device, pressurized to 2MPa by steam, and then the flash explosion is instantaneously released in 0.0875s; the raw material after the flash explosion is transported to a 316L stainless steel reaction tank, and the (w / w) Soak in tap water, heat up to 40°C, stir and adjust the pH to 11, add 1.5Kg alkaline protease (100Kg×30%×5%), stir for 4 hours, inactivate the enzyme at 85°C, coarsely filter, and pass the filtrate through NF or RO membrane concentrates the proteolysis liquid to 8%, and sprays and dries it to obtain about 28Kg of hydrolyzed protein powder. Reheat the filter residue with 10% NaOH solution to 95°C, soak with air for 0.5h, discard the waste caustic soda, wash the residue with water until neutral, then soak with 8% hydrochloric acid for 1 hour with air blowing at room temperature, discard the waste acid solution, The slag was washed with wa...

Embodiment 3

[0032] 100Kg crayfish shells are used as raw materials, which are coarsely crushed and transported to the HDSFE device, pressurized to 4MPa by steam, and then instantaneously depressurized for 0.0875s to explode; the raw materials after flash explosion are transported to a 316L stainless steel reaction tank, and are used 5 times ( w / w) Soak in tap water, temperature 10°C, stir and adjust pH to 3, add 0.3Kg compound protease (containing papain, trypsin, pepsin) (100Kg×30%×1%), stir for 1h, 85°C Inactivate the enzyme, coarsely filter, and pass the filtrate through NF or RO membrane to concentrate the protein hydrolyzate to 18%, and spray dry to obtain about 26Kg of hydrolyzed protein powder. Reheat the filter residue with 7% NaOH solution to 95°C, soak for 2 hours with gas blowing, discard the waste alkali solution, wash the residue with water until it is neutral, then soak it with 8% hydrochloric acid for 12 hours with blowing gas at room temperature, discard the waste acid solu...

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Abstract

The invention relates to a clean chitosan production technology and relates to the technical field of comprehensive utilization of wastes generated in a process of aquatic product processing and treatment and comprehensive utilization of food processing wastewater. The clean chitosan production technology comprises the following steps of: carrying out instant high-pressure steam explosion pretreatment on shrimps and crab shells taken as raw materials through a high-density steam explosion device, dissolving and extracting most of protein in the raw materials through enzymatic hydrolysis to prepare food-grade protein hydrolysate; sequentially soaking enzymolysis residues in NaOH and hydrochloric acid to prepare the high-quality chitosan; sequentially carrying out filtration treatment on an alkali waste liquid through a security filter, a carbon carbide ultrafiltration membrane and an alkali-resisting NF (Nanofiltration) membrane to obtain feed-grade protein and recycled dilute alkali liquid; treating the waste liquid soaked in acid through the security filter and the carbon carbide ultrafiltration membrane to obtain the neutral CaC12 clear water which is discharged after reaching the standard. Compared with the prior art, the clean production technology has the advantages that the whole new technology is clean and environmentally-friendly, a seperation and purification technology is simple, reasonable, short in working procedures and convenient in operation, simultaneously resources are fully and comprehensively utilized, secondary pollution is avoided, economic benefits are obviously improved, and industrialized application value is fulfilled.

Description

technical field [0001] The invention relates to a chitin clean production technology, in particular to a chitin clean production technology based on high-density steam flash explosion technology and membrane separation technology, which belongs to the comprehensive utilization of aquatic product processing waste, food processing wastewater treatment and comprehensive utilization technology field. Background technique [0002] Chitin is an important raw material in the pharmaceutical and food industries. In industry, the shells of crustaceans such as shrimp and crab are generally used as raw materials, and the raw material chitin is produced through biological or chemical methods of deproteinization and acid decalcification. In recent years, due to the large amount of waste water produced during its processing, the production in many countries has been restricted, the market supply has dropped sharply, the market is in short supply, and the price has gradually increased. At ...

Claims

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Application Information

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IPC IPC(8): C08B37/08C12P21/06C07K1/34
Inventor 赵黎明王耀松陈超琴夏泉鸣蒋丽华周家春邱勇隽
Owner EAST CHINA UNIV OF SCI & TECH
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