Alcohol distilling production method

Abstract

The invention relates to the field of alcohol production processes, in particular to an alcohol distilling production method. The alcohol distilling production method comprises the following steps: maturely-fermented mash enters a preheater, is preheated and enters a degassing section on the top of a crude distilling tower, and in the descending process, a material is heated by steam at the bottom of the crude distilling tower and is separated from ascending alcohol steam; waste mash is discharged by a pump from the bottom of the crude distilling tower, is sent to a sewage treatment plant and is comprehensively treated; the alcohol steam of the crude distilling tower goes up to an aldehyde-removing section of the crude distilling tower and impurities are removed, aldehyde-removed alcohol liquid enters the crude distilling tower and is concentrated, and crude alcohol is preheated by a crude alcohol preheater and enters a scrubbing tower; uncondensed alcohol steam and non-condensable gas are sent into the scrubbing tower and then discharged into air, and scrubbing liquid enters an impurity alcohol tank. By the alcohol distilling production method, the final ethanol concentration reaches 95.8%, the distillation effect is good, the produced alcohol can achieve a super-pure index, and the contents of aldehydes, methanol and other harmful substances in the alcohol are very low, the acetaldehyde concentration is only 2mg / L, and the methanol concentration is also much lower than a standard safety line; therefore, the alcohol distilled by the alcohol distilling production method is excellent in quality.

Description

technical field [0001] The invention relates to the field of alcohol production technology, in particular to an alcohol distillation production method. Background technique [0002] Alcohol can be made into edible alcohol by fermenting and distilling grain, cassava and sugary raw materials. With the improvement of national standards for edible alcohol, the deterioration of domestic water resources and the increasing shortage of global energy sources, it is urgent to seek a new process that can improve the quality of edible alcohol, reasonably and fully utilize water resources and reduce alcohol energy consumption. [0003] At present, the multi-tower differential pressure distillation commonly used in the production of alcohol mainly has the following processes: [0004] (1) Three-tower differential pressure process. The three towers include a crude distillation tower, a water washing tower and a rectification tower. This method is used to produce more common grade alcohol...

AI Technical Summary

Problems solved by technology

The four towers include a crude distillation tower, a water washing tower, a rectification tower and a methanol tower. When the differential pressure process of this four towers is used to produce high-grade alcohol, the output of industrial alcohol is large, the energy consumption is high, and the amount of circulating cooling water is also large.

However, since the rectification tower is only thermally coupled with the crude distillation tower, the reflux ratio of the rectification tower is limited to a certain extent, and the impurity removal effect is not ideal. At the same time, there are too many low-grade energy sources, and the amount of circulating cooling water is large and the energy consumption is high. high