Method for separating and extracting chitin from shrimp and crab shells based on degradable ionic liquid

The technology of an ionic liquid and an extraction method, which is applied in the field of waste resource recycling, can solve the problems of existing environment, increased chloride ion to water pollution, strong corrosiveness, etc., and achieves the effect of solving environmental problems and wide industrial application prospects.

Inactive Publication Date: 2017-11-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most industrial methods of extracting chitin are mainly strong acid concentrated alkali high temperature method. The first step is to use hydrochloric acid to dissolve calcium in shrimp and crab shells, which is not only highly corrosive, but also produces a large amount of waste liquid, causing environmental pollution.
The second step is to use strong alkali to dissolve the protein in decalcified shrimp and crab shells. Strong alkali will produce a large amount of high-conce

Method used

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  • Method for separating and extracting chitin from shrimp and crab shells based on degradable ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In the present embodiment, chitin is separated and extracted by the following method, which specifically includes the following steps:

[0047] (1) Put 0.500g of dried fresh shrimp shells into a 100mL beaker, add 3.0g of 10% citric acid, react for 2 hours, filter to obtain a decalcified shrimp shell and a citric acid filtrate, and then add 1.5g of citric acid 6% citric acid, reacted for 1 hour, filtered to obtain the second decalcified shrimp shell and the second citric acid filtrate, placed the first citric acid filtrate and the second citric acid filtrate respectively, and added 0.005g calcium citrate seed crystals respectively, for 10 hours Finally, calcium citrate is precipitated, totaling 0.1622g, and the calcium removal rate is over 99%. The filtrates after filtering out calcium citrate are combined and supplemented with 1.200g of 10% citric acid solution, which can be recycled.

[0048] (2) Dissolve decalcified shrimp shells with 5 g of cholinealanine ([Cho][Ala]...

Embodiment 2

[0050] The difference from Example 1 is that the secondary citric acid filtrate and secondary citric acid filtrate are obtained by filtering in step (1), and the primary citric acid filtrate and the secondary citric acid filtrate are respectively placed, and 0.0025g calcium citrate is added respectively The seed crystals precipitated calcium citrate after 10 hours, amounting to 0.1422g, and the calcium removal rate was over 99%; except that the method used and the selection of other conditions were the same as in Example 1.

Embodiment 3

[0052] The difference with Example 1 is that when dissolving the shrimp shells and dissolving the second decalcification shrimp shells in step (1), the 10% citric acid solution that is used is 3g. In addition, the method used and the selection of other conditions All the same as in Example 1, 0.1320g of calcium citrate was precipitated, and the calcium removal rate was more than 99%.

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Abstract

The present invention provides a method for separating and extracting chitin from shrimp and crab shells based on a degradable ionic liquid. The method comprises: (1) removing calcium from shrimp and crab shells by using a citric acid two-step calcium removing method to obtain calcium-removing shrimp and crab shells; and (2) dissolving proteins in the calcium-removing shrimp and crab shells by using a degradable ionic liquid, and separating to obtain the chitin. According to the present invention, through the citric acid two-step calcium removing method, by comprehensively using the degradable ionic liquid to dissolve the proteins in the calcium-removing shrimp and crab shells, the chitin in the shrimp and crab shells can be separated, and the obtained calcium citrate is the food calcium enhancer, such that the high added-value product excluding the chitin can be produced, the protein is separated, the complete-component and high-value utilization of the waste shrimp and crab shells is achieved, the waste is turned into treasure, the environmental pollution is not generated, the environmental problems caused by the use of hydrochloric acid to remove calcium and the use of alkali to remove protein in the existing chitin preparation technology using shrimp and crab shells are solved, and the method has broad industrial application prospects.

Description

technical field [0001] The invention belongs to the field of recycling and utilization of waste resources, and relates to a method for separating and extracting chitin, in particular to a method for separating and extracting chitin from shrimp and crab shells based on degradable ionic liquid. Background technique [0002] With the rapid development of my country's seafood industry and artificially cultured shrimp and crab industries, about 10 million tons of discarded shrimp and crab shells will be produced every year during processing. Due to the lack of processing and utilization technology, most of these shrimp and crab shell wastes are only used to produce low value-added products such as feed and fertilizer, and even because they are directly piled up and discarded randomly, the air near the coast and the coast is rotten and seriously pollutes the environment. . However, precious high-quality biological resources such as rich calcium (about 30-40%) protein (about 20-30...

Claims

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Application Information

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IPC IPC(8): C08B37/08C07K1/14
CPCC07K1/14C08B37/0003C08B37/003Y02P20/54
Inventor 吕兴梅石春艳温暖张锁江辛加余
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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