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High-concentration alcohol fermentation method

An alcohol fermentation, high concentration technology, applied in the field of alcohol fermentation, can solve the problems of long fermentation time and low starch conversion rate, and achieve the effect of short fermentation period and good effect

Inactive Publication Date: 2011-11-23
HENAN TIANGUAN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to different regions, raw materials, and different production technology levels in my country's alcohol production enterprises, the alcohol content of alcohol fermentation mature mash varies, and the general average level of the year has developed from 10-11% at the beginning of this century to about 12% currently; Between 50 and 60 hours, the fermentation time is relatively long; judging from the current development status of domestic fuel ethanol, the starch yield of yeast strains used for alcohol production is maintained at 51-53% (common starchy raw materials), starch The utilization rate of starch is maintained at 83-86%, and the conversion rate of starch is low

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0012] In the stage of distiller's cultivation, when yeast is cultivated at 31°C, the concentration of distiller's mash is 2% lower than that of saccharified mash in fermentation. At this time, rich nutrients (such as zinc and diammonium phosphate) are conducive to yeast reproduction; stage, the early stage of fermentation is mainly the cultivation of fermentation ability (that is, the enrichment of yeast alcoholizing enzyme); the fermentation temperature is controlled at 34°C until the alcohol concentration is 8%, and then cooled to 33°C and kept until the end of fermentation; ensure that the fermentation tank There is 200ppm of free amino nitrogen, which promotes the metabolism of yeast and ensures the number of yeast in the fermenter. When adding glucoamylase, add 2 / 3 of glucoamylase to the saccharification tank, and add the rest after 8-10 hours. It is beneficial to ensure that the glucoamylase is in the later stage of fermentation, and the post-saccharification is carried ...

Embodiment 2

[0014] In the stage of distiller's cultivation, when yeast is cultivated at 31°C, the concentration of distiller's mash is 3% lower than that of saccharified mash in fermentation. At this time, rich nutrients (such as zinc and diammonium phosphate) are conducive to yeast reproduction; stage, the early stage of fermentation is mainly the cultivation of fermentation ability (that is, the enrichment of yeast alcoholic enzyme); the fermentation temperature is controlled at 35°C until the alcohol concentration is 8%, and then cooled to 33°C and kept until the end of fermentation; ensure that the fermentation tank There are 220ppm of free amino nitrogen, which promotes the metabolism of yeast and ensures the number of yeast in the fermentation tank. When adding glucoamylase, add 2 / 3 of glucoamylase to the saccharification tank, and add the rest after 8-10 hours, so that It is beneficial to ensure that the glucoamylase is in the later stage of fermentation, and the post-saccharificati...

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Abstract

The invention discloses a high-concentration alcohol fermentation method, which comprises the following: a step of distiller's yeast cultivation, in which yeasts are cultured at 31 DEG C and the concentration of distiller's yeast fermented liquor is 2 to 3 percent lower than that of saccharified fermented liquor in fermentation; a step of fermentation, in which an early fermentation stage is mainly to culture fermentation capacity (to enrich zymase of yeasts), the fermentation temperature is kept between 34 and 35 DEG C till the concentration of the alcohol is 8 percent, then the temperature is reduced to 33 DEG C till the end of the fermentation, at least 200ppm of free amino nitrogen is kept in a fermentation tank, the metabolism of the yeasts is promoted, and the number of the yeasts in the fermentation tank is ensured; and a step of adding saccharifying enzyme, in which 2 / 3 of saccharifying enzyme is added into a saccharification tank first, the rest saccharifying enzyme is added 8 to 10 hours later, and thus, the post saccharification can be performed at a higher speed in the later stage of fermentation in the presence of the saccharifying enzyme and the fermentation speed is ensured. In the invention, two problems of fermentation concentration and fermentation period, which influence fermentation concentration, are solved, the high-concentration alcohol fermentation can be realized, the fermentation effect of the alcohol is desirable, and the fermentation period is short.

Description

[0001] technical field [0002] The invention belongs to the technical field of alcohol fermentation, and in particular relates to a high-concentration alcohol fermentation method. Background technique [0003] "High-concentration alcohol fermentation" can save water, electricity, and labor in alcohol production, reduce the pressure of sewage treatment and discharge, and have great significance for enterprises to reduce costs, improve efficiency, and realize environmentally friendly and clean production. Therefore, "high-concentration alcohol fermentation" is highly valued by global alcohol production companies. In the domestic alcohol industry and academic circles, the alcoholic fermentation of the mature mash with an alcohol content of 15% (V / V) or above is generally called "high-concentration alcoholic fermentation". Due to different regions, raw materials, and different production technology levels in my country's alcohol production enterprises, the alcohol content of a...

Claims

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Application Information

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IPC IPC(8): C12P7/06C12R1/645
CPCY02E50/17Y02E50/10
Inventor 曲爱民杜风光孙沛勇张建博熊显李鹏郭伟张黎
Owner HENAN TIANGUAN GRP
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