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Method for producing L-cystine

A production method, the technology of cystine, which is applied in the chemical industry, can solve the problems of low purity, restriction, and odor, and achieve the effects of simple process, convenient mass production, and convenient source of raw materials

Inactive Publication Date: 2013-01-23
XINYI HANLING BIO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The acid solution of animal hair has an odor; 2. The sale of L-cystine produced from animal hair to Muslim countries is subject to certain restrictions; 3. The purity of the product is lower than that of the synthetic method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Clean the poultry feathers and animal hairs (including duck feathers, goose feathers, pig hairs, and human hair) into the acid hydrolysis tank, add hydrochloric acid with a concentration of 35%, and the amount is 3 times the weight of the poultry feathers, while stirring Heating, raising the temperature to 110°C, and stirring for 10 hours, so that all poultry feathers and animal hairs are acidified to obtain a hydrolyzate; the hydrolyzate is sent to a neutralization tank, and liquid alkali is added while stirring to reduce the pH of the hydrolyzate After being adjusted to 4.9, continue to stir for 10 hours, filter after the reaction, and store the filtrate obtained for use, and the filter residue is sent to the decolorization reactor; add hydrochloric acid, pure water, and gac in the decolorization reactor, and its ratio is filter residue: hydrochloric acid: pure Water: activated carbon = 1: 1: 2: 0.2, heat while stirring, increase the temperature to 85°C, decolorize aft...

Embodiment 2

[0016] Clean poultry feathers and animal hairs (including duck feathers, goose feathers, pig hairs, and human hair) into the acid hydrolysis tank, add hydrochloric acid with a concentration of 37.5%, and the amount is 3 times the weight of poultry feathers, while stirring Heating, raising the temperature to 112.5°C, and stirring for 9 hours, so that all poultry feathers and animal hair are acidified to obtain a hydrolyzate; the hydrolyzate is sent to a neutralization tank, and liquid caustic is added while stirring to reduce the pH of the hydrolyzate After adjusting to 5, continue to stir for 10 hours, filter after the reaction, and store the obtained filtrate for later use, while the filter residue is sent to the decolorization reactor; add hydrochloric acid, pure water, and gac in the decolorization reactor, and its ratio is filter residue: hydrochloric acid: pure Water: activated carbon = 1: 1: 2: 0.2, heat while stirring, increase the temperature to 87.5°C, decolorize after...

Embodiment 3

[0018] Clean poultry feathers and animal hairs (including duck feathers, goose feathers, pig hairs, and human hair) into the acid hydrolysis tank, add hydrochloric acid with a concentration of 40%, and the amount is 3 times the weight of poultry feathers, while stirring Heating, raising the temperature to 115°C, and stirring for 8 hours, so that all poultry feathers and animal hair are acidified to obtain a hydrolyzate; the hydrolyzate is sent to a neutralization tank, and liquid alkali is added while stirring, and the pH of the hydrolyzate is reduced After being adjusted to 5.1, continue to stir for 10 hours, filter after the reaction, and store the obtained filtrate for later use, while the filter residue is sent to the decolorization reactor; add hydrochloric acid, pure water, and activated carbon in the decolorization reactor, and the ratio is filter residue: hydrochloric acid: pure Water: activated carbon = 1: 1: 2: 0.2, heat while stirring, increase the temperature to 90°...

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PUM

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Abstract

The invention discloses a method for producing L-cystine. L-cystine belongs to the field of amino acids. The method comprises that poultry feathers (comprising drake feathers, goose feathers, pig hairs and human hair), hydrochloric acid, liquid alkali, pure water, activated carbon and liquid ammonia are used as raw materials; and L-cystine is prepared by acidolysis of poultry feathers and animal hairs. The method provided by the invention utilizes the raw materials having wide sources, has simple processes and a low production cost, does not discharge a waste liquid in production and is convenient for volume production. L-cystine produced by the method has wide purposes in medicines and is a nutritional supplement agent and a cosmetic additive.

Description

Technical field: [0001] The product of the invention belongs to the field of chemical industry, and in particular relates to a production method of L-cystine. Background technique: [0002] L-cystine, the product formed by the oxidation of two cysteines through their side chain sulfhydryl groups to form a disulfide bond, molecular formula C 6 h 12 N 2 o 4 S 2 , Appearance is white hexagonal plate crystal or white crystalline powder, dissolved in dilute hydrochloric acid or sodium hydroxide test solution, extremely difficult to dissolve in water, insoluble in ethanol. L-cystine is one of the essential amino acids for the human body and has a wide range of uses. In medicine, L-cystine is an amino acid drug that can promote the redox function of cells, make the liver function vigorous, neutralize toxins, and promote white blood cells. Proliferation, preventing the development of pathogenic bacteria, mainly used for various alopecia, also used for dysentery, typhoid, influe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/58C07C319/22C07C319/28
Inventor 陈士安
Owner XINYI HANLING BIO ENG
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