Method for crystallizing L-cysteine muriate high-purity crystal

A technology of cystine hydrochloride and cysteine, which is applied in the field of crystallization to obtain high-purity crystals of L-cysteine

Inactive Publication Date: 2007-11-21
汕头市紫光古汉氨基酸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the unreasonable existing crystallization conditions, the L-cysteine ​​hydrochloride crystals obtained by crystallization separation in the electrolytic bath are powdery or fine needles, and a small amount of impurities are often mixed in the crystals, so subsequent purification processes are required to produce Obtain high-purity L-cysteine ​​hydrochloride crystals

Method used

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  • Method for crystallizing L-cysteine muriate high-purity crystal
  • Method for crystallizing L-cysteine muriate high-purity crystal

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Experimental program
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Effect test

Embodiment 1

[0013] Use hydrochloric acid and pure water to prepare 1.6 tons of hydrochloric acid solution with a concentration of 2.0N, put in 350 kg of L-cystine, add activated carbon according to 1% of the total weight after the dissolution is completed, stir for 40 minutes to decolorize, filter, and pump the filtrate into the cathode tank for Cyclic electrolysis.

[0014] The electrolysis conditions are: the voltage is 36V, the equivalent concentration of the anolyte is controlled at 2.5N, and the electrolysis time is about 16 hours.

[0015] project

Embodiment 2

[0017] Prepare 1.6 tons of hydrochloric acid solution with a concentration of 2.3N with hydrochloric acid and pure water, add 350 kg of L-cystine, add activated carbon according to 1% of the total weight after the dissolution is completed, stir for 40 minutes to decolorize, filter, and pump the filtrate into the cathode tank for Cyclic electrolysis.

[0018] The electrolysis conditions are: the voltage is 36V, the equivalent concentration of the anolyte is controlled at 3.0N, and the electrolysis time is about 16 hours.

[0019] project

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Abstract

A method for crystallizing L-beta-mercaptoalanine high-purity crystal is carried out by preparing L-beta-mercaptoalanine cathode electrolytic bath liquid by electrolyzing L-cystine, decompress concentrating for electrolytic bath liquid at 70-80 degree, reaching L-beta-mercaptoalanine equivalent concentration in concentrate to 6-8N, reaching hydrochloric acid equivalent concentration 1.2-2 times of L-beta-mercaptoalanine, agitating at 1-6 degree, lowering temperature to 8-12 degree, laying aside and crystallizing. The crystal grain size is coarse, uniform, transparent, net and diamond, the length is 4-5 mm, and width and thickness are 2-3 mm. It has 5 times re-crystallization and better purity.

Description

technical field [0001] The invention relates to a method for producing L-cysteine ​​hydrochloride, specifically, crystallization in an electrolytic bath solution for obtaining L-cysteine ​​hydrochloride by electrolysis of L-cysteine ​​to obtain high-purity L-cysteine crystallization method. Background technique [0002] L-cysteine ​​hydrochloride is mainly used as a therapeutic drug for bronchitis and radiation damage. It has the effect of reducing phlegm and blood stasis, and has a detoxification effect on poisoning caused by acrylonitrile and aromatic acids. At the same time, it has a wide range of application values ​​in the fields of bread fermentation, fruit juice preservation, compound amino acids, enhanced food, daily chemical industry and feed additives. [0003] L-cysteine ​​hydrochloride mainly exists in the form of monohydrate. The molecular formula of L-cysteine ​​hydrochloride is C 3 h 7 NO 2 S·HCl·H 2 O, the molecular weight is: 175.61, and the structural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B15/08B01D9/02C25B3/25
Inventor 黄侦凯陈德苞张楚杨赵书煌
Owner 汕头市紫光古汉氨基酸有限公司
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