Production technology of starchiness raw material alcohol

Abstract

The invention discloses a production technology of starchiness raw material alcohol. The technology is characterized in that: starchiness raw materials are liquefied and completely saccharified under a relatively high temperature; before fermentation, grain stillage and residual are separated, and the materials are washed; and saccharified liquid with a saccharide density of 25% by mass is fermented. According to the invention, high density mash fermentation is realized, fermentation time is reduced, amounts of total sugar and residual sugar are reduced, and discharging of COD, BOD and solids is reduced. With advantages such as high equipment utilization rate and low steam consumption, the production technology is suitable for the productions of alcohols produced from starchiness raw materials such as wheat, corn, rice, dried sweet potato and cassava.

Description

technical field [0001] The invention belongs to the technical field of alcohol production, in particular to a starchy raw material alcohol production process. Background technique [0002] In the known technology, the industry that utilizes starchy raw materials such as wheat and corn to produce alcohol mostly adopts the thick mash fermentation technology to improve the fermentation intensity, so that the enterprise can increase the production rate to the greatest extent, and obtains general success and popularity in the alcohol fermentation industry. recognized. At present, the process for alcohol production generally includes steps such as raw material crushing-liquefaction-saccharification-fermentation-distillation-segregation, and its main defects are: [0003] 1. Mix the raw materials at a low temperature of 30°C after the raw materials are crushed, and add liquefaction enzyme after the mixing. The starch absorbs water and swells for a short time, which is not conduciv...

AI Technical Summary

Problems solved by technology

[0004] 2. The saccharification process is incomplete saccharification, the saccharification temperature is 58-62°C lower, and the control of bacterial contamination is not strict

[0005] 3. Fermentation with slag is generally used in the fermentation process, and the separation of dregs is carried out after distillation. With the increase of the concentration of fermented mash, the fermented mash becomes more and more viscous, resulting in prolonged fermentation time, and the total sugar and residual sugar of fermented mash On the high side, the power consumption increases, the crude distillation process is affected, and the further improvement of fermentation intensity is limited; and most of them are fermented while saccharifying, and the cycle is 36-48h long; the fermentation intensity is 1.9g / (L·h), and the alcohol content is 11-12 % (v / v)

[0006] 4. The direct discharge of the distilled clear liquid not only causes waste of residual active ingredients and water resources, but also discharges about 50,000 mg / L of COD, about 30,000 mg / L of BOD, and about 8% of solids. The high discharge volume brings environmental pollution;