Technology for coupling the liquefaction process of corn alcohol and the concentration process of vinasse clear liquid

Abstract

The invention belongs to the technical field of alcohol production, in particular relates to a technology for coupling the liquification process of corn alcohol and the concentration process of vinasse clear liquid. After being processed by the operations of pre-liquification and size-mixing, corn flour of the invention is sprayed and liquefied at the temperature from 105 to 135 DEG C and under the pressure from 0.1 to 0.15 MPa; starch granules are completely fractured, the gelatinization rate can reach 90 percent, and the high-temperature liquification is contributes to the increase of concentration of materials, thereby enabling the alcohol content of fermented mature mash to be improved to 14 percent (V / V); the liquefaction process and the concentration process of clear liquid are coupled, and indirect steam produced by the liquification process is used as a thermal source for the concentration process of clear liquid, thereby saving a great amount of external steam, evaporating and concentrating more clear liquid, contributing to the increase of recovery ratio of DDGS protein feed of each ton of alcohol; and vacuum equipment for the concentration process is utilized for lowering the temperature of the liquefied mash, and compared with the traditional mode of adopting a spiral plate for cooling, more cooling water can be saved.

Description

technical field [0001] The invention belongs to the technical field of alcohol production, and in particular relates to a coupling technology of corn alcohol production liquefaction process and distiller's grain clear liquid concentration process. Background technique [0002] Alcohol is an important basic industrial raw material, which can be divided into synthetic alcohol and fermentation alcohol according to the different raw material processes. At present, the production of fermented alcohol at home and abroad mostly uses corn, potatoes, grains and other starches as raw materials, especially corn as raw materials. To produce ethanol with corn as raw material, the corn is degermed and crushed into corn flour, then liquefied, fermented, and finally distilled to produce qualified ethanol. [0003] In the production process of corn alcohol, the liquefaction process is to use enzymes to convert the corn starch in the corn flour slurry into reducing sugar (mainly glucose) tha...

AI Technical Summary

Problems solved by technology

The liquefaction process has the following disadvantages: the pressure difference of jet liquefaction is small, the corn starch granules are not completely broken, the gelatinization rate is low (≤80%), the raw material consumption is high, and the production cost is high; the secondary steam generated after flash evaporation is directly emptied , a waste of energy; after maintenance, the spiral plate heat exchanger is used for cooling, and the water consumption is large

DDGS technology has a higher removal rate of pollutants and better environmental benefits. However, due to the high investment and operating costs of evaporation and concentration, at present, 20%-40% of the clear liquid is generally used for slurry mixing in the liquefaction section, and 30% -40% of the clear liquid is concentrated, and the remaining 20%-50% of the clear liquid enters the sewage station for treatment

There are more pollutants in the clear liquid, which not only increases the sewage treatment load and treatment costs, but also causes a low recovery rate of DDGS

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