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Method for reclaiming L-cystine from N-acetyl-L-cysteine production waste liquid

A cysteine ​​and cysteine ​​technology, which is applied in the field of producing N-acetyl-L-cysteine ​​discharge liquid for treatment, can solve the problem of not finding N-acetyl-L-cysteine ​​discharge liquid treatment And recovery of L-cystine, waste water harmless treatment burden, waste and other issues, to achieve good environmental benefits, good economic benefits, and simplified treatment effects

Inactive Publication Date: 2008-01-16
湖北新生源生物工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the problem of raw materials and products being discharged with the waste liquid in the above-mentioned process production not only causes waste, but also brings a burden to the harmless treatment of waste water
[0004] The domestic literature about the production technology research of N-acetyl-L-cysteine ​​that has been seen at present, as "N-acetyl-L-cysteine ​​synthetic new method" ("Fine Chemical Industry" 2004.04) etc., does not have Discover technical information on the treatment of effluent from the production of N-acetyl-L-cysteine ​​and the recovery of L-cystine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take N-acetyl-L-cysteine ​​production process in the crude stage acidification and separate the discharge liquid 500ml of the crude product, after adjusting to pH=2 with ammonia water, use excess H 2 o 2 Oxidation, control the temperature of the system below 50°C, stir during the reaction, cool and suction filter to obtain the L-cystine product with a wet weight of 37g, and dry it to obtain a product with a dry weight of 20g.

Embodiment 2

[0021] Take 500ml of the discharge liquid after recrystallization of the crude product in the refining stage in the production process of N-acetyl-L-cysteine, pass through ozone, stop until the starch KI reagent can turn blue, and control the system temperature below 50°C, use NH 4 HCO 3 Adjust the solution to pH=4.5, stir during the process, cool and suction filter to obtain the L-cystine product with a wet weight of 33 g, and dry the product with a dry weight of 19 g.

Embodiment 3

[0023] Take 500ml of mixed discharge liquid from the crude stage and refined stage in the production process of N-acetyl-L-cysteine, oxidize it with calcium peroxide, and control the dosage until the starch KI reagent turns blue, and control the system temperature below 50°C , use (NH 4 ) 2 CO 3 Adjust the solution to pH=6, stir during the process, cool and suction filter to obtain the L-cystine product with a wet weight of 33 g, and dry it to obtain a product with a dry weight of 20.5 g.

[0024] Implementation column four

[0025] Take 500ml of the mixed discharge liquid of the crude stage and the refined stage in the production process of N-acetyl-L-cysteine, adjust it to pH=4 with NaOH solution, and use excess Na 2 o 2 Oxidation, stirring during the reaction, controlling the temperature of the system below 50°C, cooling and suction filtration to obtain a wet weight of 37g of the L-cystine product, drying the product to a dry weight of 20g.

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PUM

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Abstract

The invention provides a method in recycling L-cystine from the waste liquid generated by the production of N-acetyl-L-cysteine. Following the method, the liquid discharged in the production of N-acetyl-L-cysteine is oxidized by using peroxides and then neutralized with alkaline materials until the ph value ranges from 2 to 6. During the process, the liquid is stirred to isolate a precipitate L-cystine. The invention can turn N-acetyl-L-cysteine and L-cysteine in the waste water into L-cystine which is of high value, thus increasing the added value of production and the utilization efficiency of raw materials, at the same time, accomplishing an important step in the treatment of waste water.

Description

technical field [0001] The present invention relates to a method for treating effluents from the production of N-acetyl-L-cysteine. Background technique [0002] N-Acetyl-L-cysteine, the product form is grain. L-cystine, the product form is white powdery solid. [0003] At present, there are dozens of domestic manufacturers of N-acetyl-L-cysteine, all of which are obtained by condensation of L-cystine hydrochloride or L-cysteine ​​with acetic anhydride under alkaline conditions. This process produces N-acetyl-L-cysteine, and also produces inorganic salts sodium chloride and sodium acetate. The product is purified by recrystallization, and a certain amount of waste liquid is discharged during the production process (per ton of this product needs to be produced). Discharge waste liquid 1.5m 3 ). The waste liquid is saturated N-acetyl-L-cysteine ​​liquid, which also contains a certain amount of incompletely reacted L-cysteine ​​and inorganic salts. Obviously, the problem o...

Claims

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Application Information

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IPC IPC(8): C07C323/58C07C319/28C02F1/72C02F1/66
Inventor 曾庆群肖国安王先兵吕德祥
Owner 湖北新生源生物工程有限公司
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