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Method for extracting chitin by comprehensively treating and utilizing shrimp and crab shells

A technology for comprehensive treatment of shrimp and crab shells, applied in the field of comprehensive treatment and utilization of shrimp and crab shells to extract chitin, can solve problems such as pollution, resource waste, resource waste, and environmental pollution, and achieve high utilization value, controllable costs, and structural damage small effect

Active Publication Date: 2018-11-30
ZHEJIANG WANLI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a comprehensive treatment method for extracting chitin from shrimp and crab shells, aiming at problems such as waste of resources and environmental pollution in the traditional process of extracting chitin from shrimp and crab shells. Start treatment at the source, reduce waste discharge, and use waste as a resource, realizing a new process of "zero discharge", "zero pollution" and "cost controllable" in the true sense, effectively solving the problems in the traditional chitin production process. Problems such as resource waste and environmental pollution have broad application prospects

Method used

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  • Method for extracting chitin by comprehensively treating and utilizing shrimp and crab shells

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Embodiment 1

[0024] The comprehensive treatment of embodiment 1 utilizes the method for extracting chitin from shrimp and crab shells, and its flow chart is shown in figure 1 , including the following steps:

[0025] Step 1, raw material pretreatment: take 500g of discarded crab shells, wash and break;

[0026] Step 2, decalcification: Put the crushed crab shells into 5000mL glutamic acid solution with a concentration of 5%, stir and react at a temperature of 75°C for 4-10 hours, and replace once with a new 5000mL solution with a concentration of 5% glutamic acid solution, continue to stir and react at a temperature of 75° C. for 2 to 6 hours, decalcify the crab shells, and filter while hot to obtain filtrate A containing calcium glutamate and decalcified crab shells;

[0027] Step 3, deproteinization: mix decalcified crab shells with 5% potassium hydroxide solution at a solid-liquid ratio of 1:8, react at a temperature of 90°C for 6 hours, and hydrolyze and deproteinize crab shells. Fil...

Embodiment 2

[0033] The comprehensive treatment of embodiment 2 utilizes the method for extracting chitin from shrimp and crab shells, and its flow chart is shown in figure 1 , including the following steps:

[0034] Step 1, raw material pretreatment: take 500g of discarded crab shells, wash and break;

[0035] Step 2, decalcification: Put the broken crab shells into 4000mL of glutamic acid solution with a concentration of 6.5%, soak and react for 4-8 hours at a temperature of 80°C, and replace once with a new 4000mL solution with a concentration of 6.5% glutamic acid solution, continue to soak and react at a temperature of 80°C for 2 to 6 hours, decalcify the crab shells, and filter while hot to obtain filtrate A containing calcium glutamate and decalcified crab shells;

[0036] Step 3, deproteinization: mix decalcified crab shells with potassium hydroxide solution with a concentration of 7.5% at a ratio of 1:6, and react at a temperature of 85°C for 4 hours to hydrolyze and deproteinize...

Embodiment 3

[0042] The comprehensive treatment of embodiment 3 utilizes the method for extracting chitin from shrimp and crab shells, and its flow chart is shown in figure 1 , including the following steps:

[0043] Step 1, raw material pretreatment: Weigh 500g of discarded shrimp and crab shells, wash and break;

[0044] Step 2. Decalcification: Put the broken shrimp and crab shells into 3000mL glutamic acid solution with a concentration of 7.5%, and react with gas blowing at 85°C for 4-12 hours, then replace with a new 3000mL glutamic acid solution once. The glutamic acid solution with a concentration of 7.5% is continuously aerated at a temperature of 85°C for 4 to 8 hours, and the shrimp and crab shells are decalcified, filtered while hot, and the filtrate A containing calcium glutamate and the decalcified filtrate are obtained. Shrimp and crab shells;

[0045] Step 3, deproteinization: mix the decalcified shrimp and crab shells with 6% potassium hydroxide solution at a ratio of 1:7...

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Abstract

The invention discloses a method for extracting chitin by comprehensively treating and utilizing shrimp and crab shells. The shrimp and crab shells are decalcified by utilizing glutamic acid and deproteinized by utilizing potassium hydroxide, so that chitin meeting an industrial-grade or food-grade requirement is obtained. According to the method, calcium carbonate in the shrimp and crab shells isfirstly converted into soluble calcium glutamate and is then converted into insoluble calcium hydrophosphate (which can be used as a feed additive) while chitin is extracted, so that the recycle of relatively expensive glutamic acid is realized; and meanwhile, an alkaline protein hydrolysate generated in the deproteinization step and an acidic filtrate containing an ammonium salt and phosphate are concentrated after being mixed to obtain a liquid fertilizer (which can be used as a foliage fertilizer for plant growth) containing amino acid nitrogen, phosphorus and potassium, so that various byproducts are obtained, many things are achieved at one stroke, the clean production of chitin as well as the all-component and high-value comprehensive treatment and utilization of the shrimp and crabshells are realized, no environmental pollution is caused, reaction conditions are appropriate, the problems of resource waste and environmental pollution in a traditional process are solved, and theapplication prospect is wide.

Description

technical field [0001] The invention relates to a method for extracting chitin, in particular to a method for comprehensively treating and extracting chitin from shrimp and crab shells. Background technique [0002] my country has a vast sea area, numerous lakes, and rich resources of shrimp and crab. In 2015, the total production of shrimp and crab in my country was 6.86 million tons, and in 2016, the total production was 7.12 million tons, showing an increasing trend year by year. In the process of shrimp and crab processing, about 30% to 40% of by-products (mainly shrimp and crab shells) will be produced. If they cannot be used rationally, they will cause certain pollution to the ecological environment and increase the burden on enterprises. . [0003] The main components of shrimp and crab shells are: chitin 10-30%, calcium carbonate 30-55%, protein 6-30%. Chitin is a linear polymer polysaccharide formed by condensation of N-acetylglucosamine with β-1,4-glucosidic bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08
CPCC08B37/0003C08B37/003
Inventor 刘利萍尹应武孙武千丁慧璞
Owner ZHEJIANG WANLI UNIV
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