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Recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater

A technology of sulfosalicylic acid and p-toluenesulfonic acid, which is applied in chemical instruments and methods, sulfonic acid preparation, sulfonate preparation, etc., can solve the problems of pollution, high investment and treatment costs, and low wastewater treatment rate. Achieve the effects of reducing production costs, reducing solid waste, and increasing biodegradability

Inactive Publication Date: 2020-03-10
山西卓联锐科科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to technical limitations, until the 1970s, a relatively safe mixed dilution and aerobic treatment process was still used. The investment and treatment costs were high, the actual treatment rate of wastewater was very low, and the pollution problem could not be solved fundamentally.

Method used

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  • Recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater
  • Recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater, the specific steps are:

[0037] S1. Neutralization reaction of doxycycline hydrogenation wastewater

[0038] Take doxycycline hydrogenation wastewater and heat it to 30°C, adjust the pH of doxycycline hydrogenation wastewater with 25% sodium hydroxide solution until the pH value of doxycycline hydrogenation wastewater is 6; The temperature of the hydrogenation wastewater is controlled at 30°C, and after stirring for 30 minutes, the solution is filtered to remove insoluble matter in the solution;

[0039] S2, rectification to remove ethanol

[0040] inject the solution prepared in step S1 into a rectification tower to rectify and recover ethanol until all the ethanol in the solution is removed, wherein the temperature at the top of the rectification tower is 95°C;

[0041] S3, secondary impurity removal

[0042] Take the solution prepared in step S2, control...

Embodiment 2

[0057] The recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater, the specific steps are:

[0058] S1. Neutralization reaction of doxycycline hydrogenation wastewater

[0059] Take doxycycline hydrogenation wastewater and heat it to 35°C, adjust the pH of doxycycline hydrogenation wastewater with 30% sodium hydroxide solution until the pH value of doxycycline hydrogenation wastewater is 7; The temperature of the hydrogenation wastewater was controlled at 35°C, and after stirring for 450 minutes, the solution was filtered to remove insoluble matter in the solution;

[0060] S2, rectification to remove ethanol

[0061] inject the solution prepared in step S1 into a rectification tower to rectify and recover ethanol until all the ethanol in the solution is removed, wherein the temperature at the top of the rectification tower is 96°C;

[0062] S3, secondary impurity removal

[0063] Take the solution prepared in step S2, cont...

Embodiment 3

[0078] The recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater, the specific steps are:

[0079] S1. Neutralization reaction of doxycycline hydrogenation wastewater

[0080] Take doxycycline hydrogenation wastewater and heat it to 40°C, adjust the pH of doxycycline hydrogenation wastewater with 35% sodium hydroxide solution until the pH value of doxycycline hydrogenation wastewater is 8; The temperature of the hydrogenation wastewater is controlled at 40°C, and after stirring for 1 hour, the solution is filtered to remove insoluble matter in the solution;

[0081] S2, rectification to remove ethanol

[0082] Inject the solution prepared in step S1 into a rectification tower to rectify and recover ethanol until all ethanol in the solution is removed, wherein the temperature at the top of the rectification tower is 98°C;

[0083] S3, secondary impurity removal

[0084] Take the solution prepared in step S2, control the tem...

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Abstract

The invention relates to a recovery method of sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater, and belongs to the technical field of wastewater treatment of doxycycline and solves the technical problems of the hydrogenation wastewater treatment of doxycycline. The method includes the steps of: firstly, performing alkali neutralization, crystallization with additives, acidification and isoelectric point crystallization successively to extract the sulfosalicylate and p-toluenesulfonate in the wastewater; secondly, correspondingly converting the sulfosalicylate and p-toluenesulfonate into sulfosalicylic acid and p-toluenesulfonic acid to complete recovery of the sulfosalicylic acid and p-toluenesulfonic acid in the doxycycline hydrogenation wastewater. The method has mild reaction conditions and simple operations and employs low-cost and feasible reagents. By means of the recovery of the sulfosalicylic acid and p-toluenesulfonic acid, the quantity ofgenerated solid wastes is greatly reduced and biodegradability of the wastewater is enhanced, thus reducing production cost and facilitating industrial production.

Description

technical field [0001] The invention belongs to the technical field of doxycycline wastewater treatment, in particular to a recovery method for sulfosalicylic acid and p-toluenesulfonic acid in doxycycline hydrogenation wastewater. Background technique [0002] With the development of the pharmaceutical industry, pharmaceutical wastewater has gradually become one of the important sources of pollution. Due to the complex composition of pharmaceutical wastewater, high organic content, high toxicity, deep color and high salt content, especially poor biochemical properties and intermittent discharge , is difficult to handle. Statistics show that there are more than 50 doxycycline manufacturers in China, ranking first in the world in production output and export. Because many technical problems in its production have not been fundamentally solved, the production of doxycycline is seriously polluted, and the discharged wastewater has high CODCr value, high chroma, complex composi...

Claims

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Application Information

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IPC IPC(8): C07C303/32C07C303/02C07C303/44C07C309/30C07C309/60
CPCC07C303/02C07C303/32C07C303/44C07C309/30C07C309/60
Inventor 郭腾飞刘志昊冯慧波牛嘉雄岳晓丽宋伟平侯伟国梅建勇
Owner 山西卓联锐科科技有限公司
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