Distillation system and distillation method for producing super-superior alcohol by six-tower triple-effect differential pressure distillation

Abstract

The invention relates to a distillation system and a distillation method for producing super-superior alcohol by six-tower triple-effect differential pressure distillation. The distillation system comprises a negative pressure mash tower, an aldehyde discharge tower, a recovery tower, a dilution tower, a methanol removal tower and a rectifying tower, a crude alcohol outlet of the negative-pressure mash tower and a crude alcohol outlet of the degassing section are both communicated with a working cavity of the aldehyde discharging tower, a dealdehyded alcohol outlet of the aldehyde discharging tower is communicated with a working cavity of the diluting tower, a light alcohol outlet of the diluting tower is communicated with a working cavity of the rectifying tower, and a rectified alcohol outlet of the rectifying tower is communicated with a working cavity of the methanol removing tower; the impurity alcohol outlet of the rectifying tower is communicated with the working cavity of the recovery tower. Through the arrangement of the system structure, multi-effect thermal coupling, one-tower steam admission and six-tower work are realized, the energy consumption in the distillation process is reduced to the greatest extent, and the water-saving and steam-saving effects are remarkable; compared with five-tower triple-effect superior alcohol distillation equipment, by adding the aldehyde discharge tower, the product quality far exceeds the superior grade, part of indexes exceed the special grade, and the product quality is obviously improved.

Description

technical field [0001] The invention relates to the technical field of alcohol production equipment, in particular to a distillation system and a distillation method for producing premium-grade alcohol by six-column three-effect differential pressure distillation. Background technique [0002] At present, domestic high-grade alcohol production is mainly based on five-column three-effect distillation process device. Although the energy consumption of this process device is greatly reduced compared with the traditional two-effect distillation process, the steam consumption is reduced from 3.2 tons of steam in the traditional process to 2.4 tons. There is still a big gap in the international advanced level. In terms of the quality of alcohol products, although the alcohol produced by the five-column three-effect distillation process unit can reach the standard of premium alcohol, there is still a big gap with the premium index. [0003] With the promotion of concentrated mash ...

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Problems solved by technology

[0003] With the promotion of thick mash fermentation in the alcohol industry, the concentration of fermented mash in the industry can generally reach more than 14%. The thermal coupling method of the five-tower three-effect distillation process can no longer meet the needs of enterprises to improve quality and reduce consumption, and the energy consumption is high, so it is urgently needed Develop a superior alcohol distillation equipment with more energy saving and better product quality

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