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A method for producing fuel ethanol by corn low-temperature pretreatment

A technology of low-temperature pretreatment and fuel ethanol, applied in biofuels, fermentation, etc., can solve the problems of high labor intensity of production line operators, sharp increase in production cooling water consumption, and increase in ethanol production costs, so as to improve the utilization rate of raw materials, labor The effect of reduced strength and reduced steam consumption

Active Publication Date: 2016-03-09
COFCO GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The energy consumption of the traditional ethanol production process is very high, especially the energy consumption and gas consumption of the high-pressure cooking section account for about 35% of the energy input in the entire production process, and the resulting sharp increase in production cooling water also makes the production of ethanol The production cost increases, and the process is complicated, and the labor intensity of the production line operators is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: corn raw material is pulverized into powder, and the particle size after corn pulverization is 100% and crosses 40 mesh sieves; Be mixed with water and clear liquid and be mixed with the powder slurry of 33 mass % dry matter concentration; Then add penicillin 3ppm, acid protease 17 enzymatic activity unit / g dry corn flour, amylase 34 enzyme activity units / g dry corn flour, after adjusting the pH to 4.5, stir at 63°C for 45min to make pretreated mash; then rapidly cool it down to 32.5°C, relatively Add magnesium sulfate 2ppm, zinc sulfate 2ppm, urea 300ppm, ammonium dihydrogen phosphate 20ppm, yeast 0.2% (mass ratio of the total system), compound glucoamylase 450 enzyme activity units / g dry corn flour, and ferment for 78 hours. After fermentation, use HPLC to detect that the mature fermented wine can reach 18.7%, and the starch yield can reach 56.98%.

Embodiment 2

[0039] Embodiment 2: corn raw material is pulverized into powder, and the particle size after corn pulverization is 100% and crosses 40 mesh sieves; Be mixed with water and clear liquid and be mixed with the powder slurry of 33 mass % dry matter concentration; Then add penicillin 3ppm, acid protease 15 enzyme activity unit / g dry corn flour, amylase 30 enzyme activity units / g dry corn flour, after adjusting the pH to 4.5, stir at 60°C for 30min to make pretreated mash; then rapidly cool it down to 30°C, relatively Add 2ppm of magnesium sulfate, 2ppm of zinc sulfate, 300ppm of urea, 20ppm of ammonium dihydrogen phosphate, 0.2% of yeast (accounting for the mass ratio of the total system), and 400 enzyme activity units of compound glucoamylase / g dry corn flour to the total system, and ferment for 75 hours. After fermentation, use HPLC to detect that the mature fermented wine can reach 18.6%, and the starch yield can reach 56.95%.

Embodiment 3

[0040]Embodiment 3: corn raw material is pulverized into powder, and the particle size after corn pulverization is 100% crosses 40 mesh sieves; Be mixed with water and clear liquid the powder slurry of 33 mass % dry matter concentration, then add penicillin 3ppm, acid protease 20 enzyme activity unit / g dry corn flour, amylase 40 enzyme activity units / g dry corn flour, after adjusting the pH to 4.5, stir at 65°C for 60min to make pretreated mash; then rapidly cool it down to 35°C, relatively Add magnesium sulfate 2ppm, zinc sulfate 2ppm, urea 300ppm, ammonium dihydrogen phosphate 20ppm, yeast 0.2% (mass ratio of the total system), compound glucoamylase 500 enzyme activity units / g dry corn flour, and ferment for 85 hours. After fermentation, use HPLC to detect that the mature fermented wine can reach 18.6%, and the starch yield can reach 56.95%.

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Abstract

The invention relates to a new method for producing fuel ethanol by a low temperature pretreatment mode of corn. The method comprises the following steps: crushing corns into granules with granularity of 100%; sieving by a 40 mesh sieve; preparing a powder syrup whose dry material concentration is 33 m% with water and clear liquid; adding 15-20 U / g dry basis of acid protease and 30-40 U / g dry basis of alpha-amylase, adding 3 ppm of bacterial depressant; adjusting pH to 4.5; stirring at 60-65 DEG C for 0.5-1 hour; preparing a pretreatment mash; rapidly cooling the pretreatment mash to 30-35 DEG C; adding 0.2 m% of yeast and 400-500 U / g dry basis of complex glucoamylase, and adding nutritive salts; fermenting for 75-85 hours. Compared with the traditional high temperature boiling technology, the invention can save about 35% of steam consumption with high mature mash ethanol content and high starch liquor yield.

Description

technical field [0001] The invention relates to a method for producing fuel ethanol by means of low-temperature pretreatment of corn. Background technique [0002] In recent years, as the worldwide energy crisis has become increasingly serious, people are trying to find new energy sources to replace petroleum, and ethanol is one of the best choices. Ethanol is an oxygen-containing compound with a high octane number. Adding 5%~10% absolute ethanol to gasoline can increase its octane number by 2~3. The engine does not need any modification and will not reduce engine power. Moreover, it also contributes to the full combustion of gasoline, reduces the emission of carbon monoxide, hydrocarbons and sulfur in automobile exhaust, and is beneficial to environmental protection. [0003] Ethanol is a renewable energy produced by fermentation of starch as raw material. It has already stood out in the field of energy and has increasingly shown broad and far-reaching development prospect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/06
CPCY02E50/10
Inventor 刘文信刘劲松刘辉郭福阳从志会宫殿良金明亮王宇
Owner COFCO GROUP
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