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Preparation method for ethanol

An ethanol and steam technology, which is applied in the directions of biofuel and fermentation, can solve the problems of low ethanol yield, etc., and achieve the effects of controlling the degree of liquefaction, improving the yield and reducing the production cost.

Inactive Publication Date: 2012-03-14
安徽中粮生化燃料酒精有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield of ethanol produced by the fermentation of the existing enzymatic hydrolyzate is relatively low

Method used

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  • Preparation method for ethanol

Examples

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preparation example Construction

[0011] According to the present invention, the method for preparing ethanol comprises enzymatically hydrolyzing starchy raw materials and fermenting the obtained enzymolyzed products, wherein the method for enzymatically hydrolyzing starchy raw materials includes the following steps:

[0012] (1) Mix the starch slurry obtained from the starchy raw material with some enzymes to obtain a mixture, and contact the mixture with steam under conditions such that the temperature of the mixture after contact with the steam is 75-95° C., preferably 80-90° C. , and kept at this temperature for 30-90 minutes, preferably 50-80 minutes;

[0013] (2) The mixture contacted with steam in step (1) is contacted with steam again, the condition of contact is such that the temperature of the mixture contacted with steam again is 100-120°C, preferably 100-110°C, and at this temperature Keep it down for 1-10 minutes, preferably 5-9 minutes;

[0014] (3) The temperature of the mixture in step (2) aft...

Embodiment 1

[0041] This example is used to illustrate the method of the present invention for preparing ethanol using corn raw material.

[0042] (1) Grinding of corn raw materials

[0043] 100 parts by weight of corn (with a moisture content of 14% by weight) were pulverized to obtain a pulverized product with an average particle diameter of 1500 microns, and the pulverized product was mixed with 220 parts by weight of water to obtain a starch slurry.

[0044] Determine the total sugar content in the mixed slurry according to the total sugar direct titration method of GBT 15038-2006, wherein the weight of the total sugar is 1.11 times the weight of the starch in the crushed product, therefore, the total sugar content can be determined by the national standard method According to the formula: starch content=total sugar / 1.11, the calculated starch content in the pulverized product is 63 parts by weight / 100 parts by weight corn.

[0045] (2) Enzymolysis

[0046] At 50 DEG C, the starch sl...

Embodiment 2

[0060] This example is used to illustrate the method of the present invention for preparing ethanol using corn raw material.

[0061] (1) Grinding of corn raw materials

[0062] 100 parts by weight of the same corn raw material as in Example 1 were pulverized to obtain a pulverized product with an average particle diameter of 1800 microns, and the pulverized product was mixed with 210 parts by weight of water to obtain a starch slurry.

[0063] (2) Enzymolysis

[0064]At 60°C, the starch slurry obtained in step (1) is mixed with the enzyme of 35% by weight of the total weight of the enzyme to obtain a mixture, and the mixture is sprayed into contact with steam at 150°C in an injector (steam and mixture The ratio is 0.08:1), the contact time is 6 seconds, so that the temperature of the mixture after contacting with steam is 90°C, the pH value is adjusted to 5, and maintained at this temperature for 80 minutes;

[0065] The above-mentioned mixture after being contacted with st...

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Abstract

The invention relates to a preparation method for ethanol. The method comprises enzymolysis of starchy raw materials and fermentation of the resulting enzymolysis product. The method for enzymolysis of the starchy raw materials comprises the following steps that: (1) starch slurry generated from the starchy raw materials, and partial enzymes are mixed to obtain a mixture, the mixture contacts steam, wherein the temperature of the mixture after contacting the steam is 75-95 DEG C with the contacting conditions, and the contacting conditions are maintained for 30-90 minutes at the temperature of 75-95 DEG C; (2) the mixture contacting the steam from the step (1) contacts the steam again, wherein the temperature of the mixture after contacting the steam again is 100-120 DEG C with the contacting conditions, and the contacting conditions are maintained for 1-10 minutes at the temperature of 100-120 DEG C; (3) the mixture contacting the steam again from the step (2) is cooled to the temperature of 80-90 DEG C, and is subjected to mixing and enzymolysis with the remaining partial enzymes. With the method of the present invention, the ethanol yield can be effectively improved, the grain consumption is reduced, and the amount of the residual starch in the fermented mash is reduced, such that the production cost of the ethanol is reduced.

Description

technical field [0001] The invention relates to a method for preparing ethanol. Background technique [0002] Alcohol is an important basic industrial raw material, which is widely used in medicine, daily chemicals, ink coatings, chemical intermediates, etc. It can also be used as alcohol base, leaching agent, detergent, solvent, surfactant, etc. The main source of industrial alcohol is oil obtained by cracking long-chain organic compounds under catalyst and high temperature conditions. Recently, international crude oil prices have soared. Energy issues are closely related to the national economy and people's livelihood. The development of alternative energy is receiving more and more attention. As the world's oil resources are decreasing year by year and are non-renewable, ethanol fuel has become one of the best alternative energy sources. [0003] Alcohol, commonly known as fuel ethanol, is produced by fermentation of wheat, corn, sorghum, potato or plant fiber, and is ca...

Claims

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Application Information

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IPC IPC(8): C12P7/06C12P19/14
CPCY02E50/10
Inventor 周永生杨冬周友超崔志强何明霞
Owner 安徽中粮生化燃料酒精有限公司
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