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Treatment process of reusing crab and shrimp shell

A treatment process and shrimp skin technology, which is applied in the field of crab shell and shrimp skin processing technology, can solve the problems of emission, protein, calcium carbonate waste, environmental pollution, etc., and achieve the effect of reducing consumption

Inactive Publication Date: 2006-05-17
SHANGHAI QIBAO HIGH SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is a treatment process for the reuse of crab shell and shrimp skin, to solve the problem that the existing process can only extract chitin, and a large amount of protein and calcium carbonate are thrown away in vain, and a large amount of waste acid and waste are discharged. Alkali, causing serious environmental pollution problems

Method used

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  • Treatment process of reusing crab and shrimp shell
  • Treatment process of reusing crab and shrimp shell
  • Treatment process of reusing crab and shrimp shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 , a treatment process for reusing crab shells and shrimp skins, comprising the steps of:

[0035] 1. Take 15 grams of crab shell and shrimp skin, add a small amount of 10% NaOH solution to make it just submerge the crab shell and shrimp skin, heat to 100-110°C and soak for 1 hour, stir, and suction filter to obtain filtrate A and filter residue B;

[0036] 2. Use 1mol / L HCl in filtrate A to adjust the pH value of filtrate A to about 5. White turbidity occurs. Part of the water is evaporated and cooled to precipitate a small amount of slightly orange-yellow amino acid crystals.

[0037] 3. Add 40ml of 3mol / L HCl solution to filter residue B, make it submerged in filter residue B, stir, and suction filter to obtain filtrate C and filter residue D.

[0038] 4. Add a little excess saturated sodium carbonate solution dropwise to the filtrate C to completely precipitate the calcium ions. After the reaction, filter with suction to obtain the filtrate E and filte...

Embodiment 2

[0045] see figure 2 , a treatment process for reusing crab shells and shrimp skins, comprising the steps of:

[0046] 1. Take 15 grams of crab shell and shrimp skin, add a small amount of 10% NaOH solution to make it just submerge the crab shell and shrimp skin, heat to 100-110°C and soak for 1 hour, stir, and suction filter to obtain filtrate A and filter residue B;

[0047] 2. Use 1mol / L HCl in filtrate A to adjust the pH value of filtrate A to about 5. White turbidity occurs. Part of the water is evaporated and cooled to precipitate a small amount of slightly orange-yellow amino acid crystals.

[0048] 3. Add 40ml of 3mol / L HCl solution to filter residue B, make it submerged in filter residue B, stir, and suction filter to obtain filtrate C and filter residue D.

[0049] 4. Add a little excess saturated sodium carbonate solution dropwise to the filtrate C to completely precipitate the calcium ions. After the reaction, filter with suction to obtain the filtrate E and filte...

Embodiment 3

[0054] see image 3 , a treatment process for reusing crab shells and shrimp skins, comprising the steps of:

[0055] 1. Take 15 grams of crab shells and dried shrimps, crush them and put them into a beaker, add 40ml of 3mol / L HCl solution (Note: It is estimated that the crab shells and dried shrimps contain 12 grams of calcium carbonate, and 0.12mol HCl is required for a complete reaction), so that it is immersed in the crab shells and dried shrimps , soaked for 1 hour, stirred and soaked for 1 hour, and suction filtered to obtain filtrate C and filter residue B;

[0056] 2. Add a little excess saturated sodium carbonate solution dropwise to the filtrate C to completely precipitate calcium ions. After the reaction, suction filter to obtain filtrate E and filter residue F, discard the filtrate E, and dry the filter residue F to obtain white calcium carbonate. ;

[0057] 3. Add a small amount of 10% NaOH solution to the filter residue B, make it just submerge the crab shell and...

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Abstract

The treatment process of reusing crab and shrimp shell includes soaking crab and shrimp shell, eliminating calcium, filtering to obtain filtrate containing great amount of calcium chloride, adding sodium carbonate for reaction with calcium chloride to obtain calcium carbonate precipitate, filtering, water washing and drying to obtain white fine food level calcium carbonate powder; or, eliminating protein after the soaking step, filtering to obtain filtrate containing great amount of amino acids, regulating pH value of the filtrate to 3.5-6 to separate amino acids. The present invention can obtain chitin, edible calcium carbonate and protein from crab and shrimp shell in low sodium carbonate consumption. The present invention utilizes acid and base fully, has no toxic exhaust and is environment friendly.

Description

technical field [0001] The invention relates to a treatment process for crab shell and shrimp skin, in particular to a treatment process for recycling crab shell and shrimp skin. Background technique [0002] Chitin, also known as chitin, is white flake or powder; solid, specific gravity 0.3, highly insoluble, only soluble in concentrated acid. It can exist stably at room temperature. Its molecular formula is shown on the left. After heat treatment with concentrated alkali, chitin can be deacetylated to generate chitosan (also known as chitosan or chitosan), which is white, slightly pearly, and translucent sheet-like solid. The structure is shown in the appendix. Figure 4 . [0003] Chitosan has good chemical stability, non-toxic, insoluble in water and alkaline solution, but soluble in dilute acetic acid. Iodine tincture can be used to distinguish chitin and chitosan. The mixture of chitin and iodine is yellow, and chitosan can absorb elemental iodine and appear purple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08A23L33/16C01F11/18
Inventor 韩一昊赵琳博黎良枝龚润曾
Owner SHANGHAI QIBAO HIGH SCHOOL
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