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Method for improving quality of DDGS (distillers dried grains with soluble) in corn ethanol process through secondary fermentation of distillers' grains

A secondary fermentation and ethanol technology, applied in the direction of fermentation, etc., can solve the problems affecting the effective content of lysine, the dark brown color of DDGS, and the quality of DDGS, so as to inhibit Maillard reaction, weaken Maillard reaction, high Effect of Corn Starch Conversion and Ethanol Yield

Pending Publication Date: 2022-07-29
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Maillard reaction is prone to occur during the drying process of distiller's grains, which makes the color of DDGS darker to dark brown, burnt or smoky, which affects the effective content of lysine in it and reduces its utilization rate, thus affecting DDGS. quality
The high-quality DDGS imported from the United States is golden yellow, and the DDGS produced by domestic fuel ethanol plants generally has the problem of dark brown color. In addition to the difference between local corn and high-quality corn raw materials from the United States, the production process of distiller’s grains drying process is also quite different from that of American fuel ethanol plants. , so in order to improve the utilization value of DDGS as feed and keep its nutritional content to the greatest extent, it is necessary to study and improve the existing fuel ethanol DDGS production process

Method used

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  • Method for improving quality of DDGS (distillers dried grains with soluble) in corn ethanol process through secondary fermentation of distillers' grains
  • Method for improving quality of DDGS (distillers dried grains with soluble) in corn ethanol process through secondary fermentation of distillers' grains
  • Method for improving quality of DDGS (distillers dried grains with soluble) in corn ethanol process through secondary fermentation of distillers' grains

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Effect test

Embodiment 1

[0052] The DDGS of this example was prepared by the following method:

[0053] (1) the corn flour is mixed with water, so that the dry weight of the corn flour in the mixed solution is 30wt%, and stirring is uniform;

[0054] (2) adjusting the pH of the above-mentioned corn suspension to 5.8, adding starch liquefaction enzyme, the amount of starch liquefaction enzyme added is 0.048wt% of the dry weight of corn flour, and liquefying at 90°C for 3 hours to obtain corn liquefaction liquid;

[0055] (3) cooling the above-mentioned corn liquefaction liquid to 30° C., adjusting the pH to 5.0, adding starch saccharification enzyme, cellulase and hemicellulase, wherein the addition amount of saccharification enzyme is 0.1 wt % of the dry weight of corn flour, and cellulase The addition amount is 0.6wt% of the dry weight of corn flour, the addition amount of hemicellulase is 0.1wt% of the dry weight of corn flour, urea is added, and the addition amount of urea is 1.28g / kg slurry, and t...

Embodiment 2

[0061] The DDGS of this example was prepared by the following method:

[0062] (1) the corn flour is mixed with water, so that the dry weight of the corn flour in the mixed solution is 30wt%, and stirring is uniform;

[0063] (2) adjusting the pH of the above-mentioned corn suspension to 5.8, adding starch liquefaction enzyme, the amount of starch liquefaction enzyme added is 0.048wt% of the dry weight of corn flour, and liquefying at 90°C for 3 hours to obtain corn liquefaction liquid;

[0064] (3) cooling the above-mentioned corn liquefaction liquid to 30° C., adjusting the pH to 5.0, adding starch saccharification enzyme, cellulase and hemicellulase, wherein the addition amount of saccharification enzyme is 0.1 wt % of the dry weight of corn flour, and cellulase The addition amount is 0.6wt% of the dry weight of corn flour, the addition amount of hemicellulase is 0.1wt% of the dry weight of corn flour, urea is added, and the addition amount of urea is 1.28g / kg slurry, and t...

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Abstract

The invention discloses a method for improving DDGS (distillers dried grains with soluble) quality in a corn ethanol process through secondary fermentation of distillers' grains. According to a traditional corn ethanol production process, corn flour is used as a raw material, and fuel ethanol and vinasse are obtained through liquefaction, simultaneous saccharification and fermentation and distillation processes. On the basis of the corn ethanol production process, the obtained distillers' grains are subjected to secondary synchronous saccharification and fermentation, the content of cellulose, residual starch and residual glucose in the distillers' grains is reduced, the ethanol yield is increased, meanwhile, the strength of a Maillard reaction in the DDGS preparation process is weakened, and then the DDGS with the improved quality is obtained. According to the method, the color and luster of the DDGS can be improved, the quality of the DDGS is improved, and the market competitiveness of the DDGS and the technical economy of an original corn ethanol process are enhanced.

Description

technical field [0001] The invention belongs to the technical field of biological energy, and relates to a method for improving the quality of DDGS in a corn ethanol process, in particular to a method for improving the quality of DDGS in the corn ethanol process through the secondary fermentation technology of distiller's grains. Background technique [0002] Biofuel ethanol has become one of the main alternative fuels for ground transportation in the world today due to its good environmental protection, renewability, good compatibility with gasoline and many other advantages. Corn is rich in starch and is one of the ideal raw materials for fermented production of fuel ethanol. The corn raw material is crushed, liquefied and saccharified to obtain mash rich in fermentable sugar, and then fermented by yeast to generate ethanol. Ethanol is distilled and purified. The rectification process and the dehydration process obtain anhydrous ethanol (water volume fraction content≤0.8%)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10
CPCC12P7/10
Inventor 何皓金明杰郭琪张佳王盛炜许召贤王旻烜
Owner PETROCHINA CO LTD
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