Process method for recovering butanol-butyl acetate from antibiotic production wastewater

Abstract

The invention relates to a process method for recycling butanol-butyl acetate from antibiotic production wastewater. The process method comprises the following steps: preheating wastewater of which the content of butanol-butyl acetate is 1-5 percentage by mass by using a tower bottom of a rectifying tower; further heating to 80-85 DEG C by using a heat exchanger, feeding into a flash column; feeding distillate from the top of the flash column into the rectifying tower; and separating the distillate. As a tubular type heat exchanger on the top of the rectifying tower is connected with a pressure reducer so that the shell pass of the rectifying tower and the tubular type heat exchanger is maintained to be less than 35kPa. The steam on the top of the tower is condensed and fed into a phase splitting tank, the light phase is fed into a tank to be detected, the heavy phase flows back, and the tower bottoms are cooled to 30-35 DEG C and discharged. By adopting the process method, the recycling rates of butanol and butyl acetate are greatly increased; by comprehensive utilization of pressure-reduced distillation and heat, the energy consumption can be reduced and remarkable practicability and economical efficiency are achieved.

Description

technical field [0001] The invention relates to a process method for recovering and separating butanol-butyl acetate from antibiotic production wastewater by flash distillation and rectification. Background technique [0002] Antibiotics have been widely used in clinical medicine since they were discovered by humans. They are important chemical drugs for humans to control infectious diseases, protect human health, and prevent and control animal and plant diseases. With the development of the pharmaceutical industry, the types of antibiotics are also increasing, and there are more than 100 types so far. my country's antibiotic production industry is developing rapidly, and now there are more than 300 enterprises producing more than 70 varieties of antibiotics accounting for 20-30% of the world's raw material medicine production, becoming one of the world's major producers of antibiotic preparations. [0003] Domestic production of antibiotics is huge, butanol and butyl aceta...

AI Technical Summary

Problems solved by technology

However, due to its extremely low composition content, most of which is water, the amount of steam required in the distillation process is too large, and the energy consumption is relatively high

[0004] The main reasons why the existing process consumes a lot of energy are: the heat recovery of the liquid discharged from the rectification column is insufficient; Only when the flow rate is the same, the separation requirements can be achieved under the same number of plates

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