Thermal coupling apparatus and process for alcohol differential pressure distillation and waste liquor concentrate of molasses raw material

Abstract

The invention discloses an alcohol differential pressure distillation and waste solution concentration thermal-coupling device and technology thereof for syrup raw materials. The device comprises a set of differential pressure distillation device which is provided with a coarse distillation tower, a washing tower and a rectification tower, and a two-stage multi-effect vacuum evaporation and concentration device. The technology comprises: fermenting mash from the fermentation procedure is subjected to differential pressure distillatory refining of the coarse distillation tower, the washing tower and the rectification tower, and common edible alcohol can be obtained; a waste solution is subjected to two-stage multi-effect vacuum evaporation and concentration in turn; and wine vapor on the top of the coarse distillation tower is introduced into a first stage of the multi-effect vacuum evaporation and concentration device and taken as a heat source for evaporation. The device adopts the differential pressure thermal-coupling technology to realize mutual matching and utilization of energy in the evaporation procedure and the waste solution evaporation and concentration procedure so as to reduce the total vapor consumption of distillation during production of the common edible alcohol through the syrup raw materials, and concentration treatment of the waste solution to be between 3.0 and 3.6 tons per ton of finished alcohol, and saves approximately 30 to 40 percent of vapor, and approximately 25 tons of cooling water consumption per ton of the finished alcohol; and two-stage multi-effect vacuum evaporation and concentration can prolong the fouling period of the device which is then easy to overhaul.

Description

technical field [0001] The invention relates to a device and process for alcohol differential pressure distillation and waste liquid evaporation and concentration using molasses as raw material. technical background [0002] The waste liquid produced by the production of alcohol from molasses has a high content of organic pollutants. The COD content is generally 80,000-120,000 mg / l, and the highest can reach 170,000 mg / l. Direct discharge will cause serious environmental pollution. At present, the methods of alcohol production and waste liquid treatment with molasses as raw material generally have the following processes: [0003] (1) The molasses alcohol distillation part and the molasses alcohol waste liquid treatment part are independent sections, and the logistics are connected in sequence, and the energy flow is not related to each other. [0004] ①Molasses alcohol distillation part: [0005] The conventional two-tower or multi-tower differential pressure distillation...

AI Technical Summary

Problems solved by technology

However, the one-effect evaporator that directly processes mature mash needs to introduce heating steam, and the equipment manufacturing is complicated. Moreover, the entire evaporation and concentration device has a large processing capacity, high energy consumption, and is not easy to process control, which is not conducive to the smooth operation of the entire combined device process.

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