Production method for L-cysteine

A cysteine, production method technology, applied in the direction of electrolytic organic production, electrolysis process, electrolysis components, etc., can solve the problems of difficult waste acid treatment, serious environmental pollution, low yield, etc., to achieve pollution-free waste discharge, The production process is simple and the substrate conversion rate is high.

Inactive Publication Date: 2016-01-27
XINYI HANLING BIO ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The production methods of L-cysteine ​​include reduction method after hair hydrolysis, microbial enzyme method, chemical method and fermentation method. The reduction method after hair hydrolysis is the traditional production method of L-cysteine. This method has low yield and can High consumption, large amount of irritating gas generated during hydrolysis, difficult disposal of waste acid, serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Send L-cystine and finely filtered dilute hydrochloric acid into the chemical reaction kettle with a molar ratio of 1:10, and stir evenly. At this time, the pH of the liquid in the kettle should be 0.9-1.1. The temperature of the liquid was raised to 58°C, adding activated carbon accounting for 15% of the total molar amount of the liquid in the kettle for decolorization, and the decolorization was completed after stirring for 0.55 hours. The liquid in the kettle is sent to a precision filter for filtration, and the filter cake is discharged. The filtrate is sent to an electrolytic cell for electrolysis for 9 hours. After the electrolysis is completed, it is sent to a precision filter for precision filtration, and the filter cake is discharged. Acid solution, at this moment, add the dilute sodium hydroxide aqueous solution of formula quantity to carry out neutralization, adjust the pH of filtrate to be 6.9, obtain neutral L-cysteine ​​solution. Send the neutral L-cystein...

Embodiment 2

[0019] Send L-cystine and finely filtered dilute hydrochloric acid into the chemical reaction kettle with a molar ratio of 1:10, and stir evenly. At this time, the pH of the liquid in the kettle should be 0.9-1.1. The temperature of the liquid was raised to 60°C, adding activated carbon accounting for 15% of the total molar amount of the liquid in the kettle for decolorization, and the decolorization was completed after stirring for 0.50 hours. The liquid in the kettle is sent to a precision filter for filtration, and the filter cake is discharged. The filtrate is sent to an electrolytic cell for electrolysis for 10 hours. After the electrolysis is completed, it is sent to a precision filter for fine filtration, and the filter cake is discharged. In between, a neutral L-cysteine ​​solution was obtained. Send the neutral L-cysteine ​​solution into the reaction kettle for concentration under reduced pressure. After concentrated and crystallized under reduced pressure, it is sent...

Embodiment 3

[0021] Send L-cystine and finely filtered dilute hydrochloric acid into the chemical reaction kettle with a molar ratio of 1:10, and stir evenly. At this time, the pH of the liquid in the kettle should be 0.9-1.1. The temperature of the liquid was raised to 62°C, adding activated carbon accounting for 15% of the total molar amount of the liquid in the kettle for decolorization, and the decolorization was completed after stirring for 0.45 hours. The liquid in the kettle is sent to a precision filter for filtration, and the filter cake is discharged. The filtrate is sent to an electrolytic cell for electrolysis for 11 hours. After the electrolysis is completed, it is sent to a precision filter for precision filtration, and the filter cake is discharged. Acid solution, at this moment, add the dilute sodium hydroxide aqueous solution of formula quantity to carry out neutralization, adjust the pH of filtrate to be 7.1, obtain neutral L-cysteine ​​solution. Send the neutral L-cystei...

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Abstract

The invention discloses a production method for L-cysteine, and the method belongs to the field of production of amino acids. According to the method, L-cystine, diluted hydrochloric acid with the concentration of 20%, active carbon and a sodium hydroxide aqueous solution with the concentration of 10% are employed as raw materials for producing L-cysteine. The method possesses the advantages of being simple in production technology, mild in reaction conditions, high in substrate conversion rate, free of polluted waste discharge, high in product purity, convenient for batch production, and the like. The main purposes of the product comprise: on the medicine aspect, the product is capable of detoxifying, is capable of effectively preventing and treating radioactive damage, and possesses effects of improving inflammation and skin allergic symptoms; on the cosmetics aspect, the product is a natural whitening cosmetic, and can be used to produce hair-waving essence and sunscreen cream; and on the foodstuff aspect, the product can be used as a bread fermentation promoter, an antistaling agent, a nutrition additive of pet/beast food, and the like.

Description

Technical field: [0001] The product of the invention belongs to the field of amino acid production, and in particular relates to a production method of L-cysteine. Background technique: [0002] Cysteine ​​is a common amino acid in organisms and one of the essential amino acids for the human body. It is a sulfur-containing α-amino acid and its scientific name is 2-amino-3-mercaptopropionic acid. Cysteine ​​is derived from Methionine and serine are synthesized via cystathionine. There is an amino group on the carbon atom directly connected to the carboxyl group in the amino acid. The groups or atoms connected to this carbon atom are different, which are called chiral carbon atoms. When a beam of polarized light passes through them, the polarization direction of the light will be rotated. According to the direction of rotation, it is divided into left-handed and right-handed, that is, L-series and D-series. The common natural cysteine ​​is L-cysteine. In turn, D-cysteine ​​i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/00
Inventor 陈士安陈徐
Owner XINYI HANLING BIO ENG
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