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Method for preparing ethanol by raw materials containing cellulose

A technology for cellulose and raw materials, applied in the field of ethanol preparation, can solve the problems of reducing the yield of ethanol, reducing the proportion of cellulose, etc., and achieve the effects of improving the yield and the production efficiency

Active Publication Date: 2012-10-03
COFCO GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presumed reason may be that due to the large amount of cellulose-containing raw materials put into the steam explosion device in each batch, and the difference in the accumulation mode of each batch of raw materials or the instability of steam explosion conditions, it is impossible to ensure that all the cellulose-containing raw materials The cellulose raw material fully absorbs the water vapor within a few minutes after being steamed, so there are still most of the cellulose-containing raw materials that cannot be completely exploded by the water vapor inside because they cannot fully absorb the water vapor. As a result, the lignin sheath embedding cellulose and hemicellulose in the cellulose-containing raw material cannot be fully destroyed, reducing the proportion of cellulose in the cellulose-containing raw material that can be contacted with enzymes, thereby reducing the yield of ethanol

Method used

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  • Method for preparing ethanol by raw materials containing cellulose
  • Method for preparing ethanol by raw materials containing cellulose
  • Method for preparing ethanol by raw materials containing cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example illustrates the method of the present invention for preparing ethanol from cellulose-containing raw materials.

[0057] (1) Continuous steam explosion

[0058] Test like figure 1 For the corn stalk raw material shown, the water content of the corn stalk measured according to the above method is 20% by weight. The raw material is cut into small segments of 1.5 cm × 0.2 cm × 0.5 cm, and the corn stalk section with a water content of 20% by weight It is continuously fed from the feeder, and water showering is performed before being conveyed to the heat preservation pressure device. The water showering makes the water content of the corn stalk section 40% by weight. Then, 2,000 grams of corn stalks with a moisture content of 40% by weight are continuously transported to the thermal insulation pressure device. The pressure of the thermal insulation pressure device is 1.6 MPa and the temperature is 195°C. The corn stalks are continuously in the thermal insulation pres...

Embodiment 2

[0069] This example illustrates the method of the present invention for preparing ethanol from cellulose-containing raw materials.

[0070] Ethanol was prepared according to the method of Example 1, except that the corn stalk section with a water content of 20% by weight was continuously fed from the feeder, and water showering was performed before being transferred to the heat preservation pressure device. The water content of the corn stover section is 75% by weight. Then according to the conditions and methods of Example 1, 2000 grams of the corn stalks with a moisture content of 75% by weight were continuously transported to the thermal insulation pressure device for continuous steam explosion. After the steam explosion waste was collected and washed with water, a total of 3000 grams of solid steam explosion waste was obtained ( The water content is 83.43% by weight).

[0071] According to the method of HPLC analysis of sulfuric acid hydrolyzed steam explosion product describe...

Embodiment 3

[0074] This example illustrates the method of the present invention for preparing ethanol from cellulose-containing raw materials.

[0075] Ethanol was prepared according to the method of Example 1, except that after the 2000 grams of corn stalk section with a water content of 20% by weight was continuously fed from the feeder, it was directly transported to the insulation pressure device for continuous steam without water showering. Explosion and steam explosion conditions were the same as in Example 1. After collecting and washing the steam explosion ruins, a total of 3556 grams of solid steam explosion ruins (water content 55% by weight) were obtained.

[0076] According to the method of HPLC analysis of sulfuric acid hydrolyzed steam explosion product described in Example 1, it was determined that 3553 grams of steam explosion product contained 672 grams of cellulose and 196.8 grams of hemicellulose.

[0077] According to the method of Example 1, the above steam explosion bankrup...

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Abstract

The invention discloses a method for preparing alcohol by adopting a raw material containing cellulose, which comprises the steps of exploding the raw material containing the cellulose by steam, enzymolyzing an obtained steam explosion product, and fermenting an obtained enzymolysis product, wherein a method for exploding the raw material containing the cellulose by steam comprises the following steps: the raw material containing the cellulose is continuously conveyed into a thermal insulation pressure device, and partial raw material containing the cellulose is released to normal pressure inthe thermal insulation pressure device every 5 to 12 seconds after the raw material containing the cellulose is maintained for 3 to 10 minutes in the thermal insulation pressure device. The method for preparing the alcohol by continuously exploding the raw material containing the cellulose by steam can ensure that the raw material containing the cellulose continuously and fully absorbs moisture under steady conditions, ensure that water vapor dashes out during the pressure release, and fully destroys a lignin sheath used to embed the cellulose and hemicellulose in the raw material containing the cellulose to increase the proportion of the cellulose, which can contact enzyme, in the raw material containing the cellulose, thereby improving the yield of the alcohol.

Description

Technical field [0001] The present invention relates to a method for preparing ethanol, and more specifically, to a method for preparing ethanol using cellulose-containing raw materials. Background technique [0002] In the prior art, ethanol can be prepared from cellulose-containing raw materials. The cellulose-containing raw materials are generally plant roots, stems and leaves, including straw. The stalks are the roots, stems and leaves remaining after the seeds or fruits of crops (generally herbaceous plants) are harvested, mainly stems and leaves, such as corn stalks, sorghum stalks, rice stalks, wheat stalks, and corn stalks, including beans Straws of oil plants and cotton stalks. The cellulose, hemicellulose and lignin in the straw are tightly combined by covalent bonds and / or non-covalent bonds, and the three account for about 70-90% by weight of the total weight of the straw dry matter. The content of cellulose, hemicellulose and lignin in straw will vary with differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12P39/00C12R1/865C12R1/84
CPCY02E50/16Y02E50/10
Inventor 刘文信刘甲申王国忠谢成华岳国君林海龙邓立康
Owner COFCO GROUP