Device and method for recovering light alcohol by combining MVR and recovery tower

Abstract

The invention discloses a device and a method for recovering light alcohol by combining an MVR and a recovery tower. The device comprises a first recovery tower and an MVR steam compressor, the first recovery tower is connected with a raw material preheater, and the top is connected with the MVR steam compressor, a first tower reboiler and a first tower reflux tank; the first tower reboiler is connected with the first recovery tower, and the bottom of the first recovery tower is connected with the first tower reboiler; the first tower reboiler is connected with a first tower reflux tank; the first tower reflux tank is respectively connected with the top of the first recovery tower and a finished product cooler; the top of a second recovery tower is connected with a second tower condenser, and the second tower condenser is connected with a second tower reflux tank; the second tower reflux tank is respectively connected with a second recovery tower and the finished product cooler; the raw material preheater is connected with a second tower feeding preheater and the second recovery tower; and the second recovery tower is connected with a second tower reboiler and the second tower feeding preheater. The MVR steam compressor is used for compressing alcohol steam, the two recovery towers are used for recovering light alcohol, the steam consumption is low, and the recovery rate is high.

Description

technical field [0001] The invention relates to the technical field of weak alcohol recovery, in particular to a device and a method for recovering weak alcohol in combination with an MVR and a recovery tower. Background technique [0002] The main uses of alcohol are: organic synthesis of solvents; crystallization of various compounds; detergents; Solvents and pesticides, medicines, rubber, plastics, artificial fibers, detergents, etc., can also be used as antifreeze, fuel, disinfectants, etc. Therefore, alcohol is an important raw material. Currently, the device used to produce alcohol in China Most of the production equipment for medium and light alcohol recovery is based on single-tower distillation and concentration, and the steam consumption per ton of finished alcohol is 1.3-1.4t. The patent application number 200520085553.8 discloses a differential pressure distilling light alcohol recovery device, which utilizes the positive and negative pressure of the positive an...

AI Technical Summary

Problems solved by technology

The patent with application number 201911398588.X discloses a three-effect membrane separation and dehydration energy-saving method and device for producing anhydrous alcohol. Through the multi-effect utilization of energy, light alcohol can be concentrated and recovered without consuming excess energy, but the The device is quite restrictive, it can only be used for three-effect membrane separation to produce anhydrous alcohol, and cannot be applied to other alcohol production equipment

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