The treatment method of n-acetylcysteine ​​production waste liquid

Abstract

The invention discloses a treatment method for N-acetylcysteine ​​production waste liquid. The method comprises the following steps: (1) adjusting the pH of the N-acetylcysteine ​​production waste liquid to 2-5, and then performing a reduction reaction with a reducing agent; (2) converting the pH of the reaction liquid obtained in step (1) to 2-5. The pH is adjusted to 7.5-8.6, followed by acylation reaction with acetic anhydride, and then separated; wherein, the reducing agent is zinc powder, tin powder, magnesium powder or dithiothreitol. The treatment method of the present invention fully recovers the substances in the production waste liquid, improves the utilization rate of raw materials, and the quality of the recycled product is good, and the specific rotation is +22.2°~+23.2°; at the same time, the content of organic matter in the waste water is reduced, so that Wastewater treatment is easier to meet discharge standards.

Description

technical field

[0001] The present invention relates to a treatment method of N-acetylcysteine ​​production waste liquid. Background technique

[0002] N-acetylcysteine ​​(Acetylcysteine, Ac-Cys), chemical name is N-acetyl-L-cysteine, molecular formula: C 5 H 8 NO 3 S, molecular weight: 162.1875. This product is a white crystalline powder; it has a garlic-like odor and sour taste; it has hygroscopic properties. Soluble in water, soluble in ethanol, insoluble in dichloromethane and ether.

[0003]

[0004] N-acetylcysteine ​​is a mucolytic agent, which is suitable for dyspnea caused by a large amount of sticky phlegm obstruction and dyspnea, and can also be used for postoperative dyspnea, acute and chronic bronchitis, bronchiectasis, pneumonia, Tuberculosis, emphysema, etc., which cause thick sputum and difficulty in expectoration, are now mostly used for the treatment of idiopathic interstitial lung. In recent years, studies have found that the 3% aqueous solution o...

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