Solvent recovery method in pharmacy and solvent recovery system for implementing same

Abstract

A solvent recovery device in pharmacy which is mainly characterized in that a liquid ring pump is used for extracting the solvent steam which is separated from a gas-liquid separator, the liquid ring pump increases the pressure of the solvent steam, and then a condenser and the gas-liquid separator carries out the secondary condensation and the gas-liquid separation of the solvent steam after the pressure increases. A solvent recovery system for achieving the method is mainly characterized in that a steam exhaust port of the gas-liquid separator is connected with the liquid ring pump, an output of the liquid ring pump is sequentially connected with a secondary condenser and a secondary gas-liquid separator in series, a liquid discharge port of the secondary gas-liquid separator is connected with a working liquid input port of the liquid ring pump and a recovery tank, and the liquid ring pump takes the solvent as the working liquid. The solvent recovery device can not only increase the times of the condensation and the gas-liquid separation of the solvent stream, but can also increase the condensation pressure during the secondary condensation process, thus significantly increasing the solvent recovery rate, reducing the solvent loss and the production cost of the pharmaceutical industry and reducing the environmental pollution.

Description

technical field [0001] The invention relates to the pharmaceutical industry, in particular to a method for recovering solvents in the pharmaceutical process. Background technique [0002] The solvent used in the pharmaceutical process is a catalyst. In order to reduce production costs and reduce environmental pollution, solvents need to be recovered. The method of solvent recovery is to heat the liquid solvent in the raw material tank to make the solvent boil to form steam, then extract the steam from the raw material tank and cool it with a condenser to form wet steam, and then use a vapor-liquid separator to separate the solvent liquid in the wet steam The droplets are separated from the vapor, and the solvent droplets are aggregated and can be returned to the pharmaceutical equipment for reuse. In the prior art, the negative pressure required to extract the solvent vapor in the raw material tank and the pressure difference required to drive the vapor through the condens...

AI Technical Summary

Problems solved by technology

In the prior art, the negative pressure required to extract the solvent vapor in the raw material tank and the pressure difference required to drive the vapor through the condenser and the vapor-liquid separator are provided by the water jet pump, resulting in The following disadvantages: the solvent vapor is in a negative pressure state in the condenser, and the condensation pressure is low, which is not conducive to the condensation of steam, and the solvent recovery rate is low; restricted by the working principle of the water jet pump, the solvent vapor separated from the vapor-liquid separator reaches After the water jet pump has to be mixed with water, this part of the solvent vapor is difficult to recycle and can only be discarded, which not only causes waste but also pollutes the environment

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