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Process for preparing ethanol by using cellulose-containing raw material

A technology of cellulose and raw materials, applied in the field of ethanol preparation, can solve the problems of low ethanol yield and achieve the effect of improving sugar conversion rate and yield

Active Publication Date: 2008-10-22
COFCO GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the defects of the low yield of ethanol produced by the existing method for preparing ethanol from cellulose-containing raw materials, and provide a method for preparing ethanol using cellulose-containing raw materials with high ethanol yield

Method used

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  • Process for preparing ethanol by using cellulose-containing raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example is used to illustrate the method of the present invention for producing ethanol using cellulose-containing raw materials.

[0057] (1) Pretreatment of cellulose-containing raw materials

[0058] Cut 1000 grams of impurity-free corn stalks (water content 10%) into small pieces not exceeding 1.2 cm x 0.5 cm x 1.0 cm, maintain a pressure of 1.6 MPa at 195 ° C for 5 minutes, and then release the pressure to complete steam explosion. The resulting steam explosion product and 70°C water were stirred and mixed for 30 minutes according to a mass ratio of 1:3, and then solid-liquid separation was carried out at a speed of 900 rpm with a LW400 decanter centrifuge (Zhangjiagang Huada Centrifuge Manufacturing Co., Ltd.) , Obtain 3000 grams of water-washed steam explosion product (moisture content is 70% by weight) altogether.

[0059] Determination of the total weight of cellulose and the total weight of hemicellulose in the resulting solid steam explosion product:

...

Embodiment 2

[0072] This example is used to illustrate the method of the present invention for producing ethanol using cellulose-containing raw materials.

[0073] Ethanol was prepared according to the method of Example 1, the difference was that in the pretreatment step of cellulose-containing raw materials, the steam explosion product was not washed with water; in the enzymatic hydrolysis step, the steam explosion product was mixed with enzymes in three batches, The amount of the first batch of steam explosion waste added is 60% of the weight of the remaining whole steam explosion waste after the sampling test, and it is kept and mixed at 50°C for 100 minutes; then the second batch of steam explosion waste is added, and the second batch of added steam explosion waste The amount of the product is 20% of the weight of all remaining steam explosion products after the sampling test, and it is kept and mixed for 50 minutes at 50°C; then the third batch of steam explosion products is added, and...

Embodiment 3

[0075] This example is used to illustrate the method of the present invention for producing ethanol using cellulose-containing raw materials.

[0076] Prepare ethanol according to the method of Example 1, the difference is that in the enzymatic hydrolysis step, the water-washed steam explosion product is mixed with enzymes in three batches, and the amount of the water-washed steam-explosion product added in the first batch is all the remaining water-washed product after the sampling test 20% of the weight of the steam explosion product, heat and mix at 52°C for 20 minutes; then add the second batch of water-washed steam explosion product, the amount of the second batch of water-washed steam explosion product is the weight of all the remaining water-washed steam explosion product after sampling test 40% of the water-washed steam-explosion product, heat and mix for 40 minutes at 52°C; then add the third batch of water-washed steam-explosion product. , and the enzymatic hydrolysi...

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Abstract

The invention provides a method of adopting material containing cellulose to prepare ethanol. The method comprises the steps of mixing the material containing the cellulose with enzyme for enzyme digestion to obtain a zymohydrolysis product and fermenting the zymohydrolysis product, wherein, the method of mixing the material containing the cellulose with the enzyme comprises the steps of mixing the material containing the cellulose with the enzyme in batches for at least two times, and the quantity of the material containing the cellulose to be added in each batch is at most sixty percent of the total weight of the material containing the cellulose. The ethanol with higher productivity can be obtained by adopting the method.

Description

technical field [0001] The present invention relates to a process for the production of ethanol, and more particularly to a process for producing ethanol from cellulose-containing feedstock. Background technique [0002] The prior art method for preparing ethanol from cellulose-containing raw materials, such as straw, mainly includes three steps: 1. pretreatment of cellulose-containing raw materials, 2. enzymatic hydrolysis of cellulose; 3. fermentation of sugar to produce ethanol. [0003] Cellulose-containing raw materials are generally roots, stems and leaves of plants, including straw. The stalks are the roots, stems and leaves left after harvesting fruits of crops (generally herbaceous plants), mainly stems and leaves, such as corn stalks, sorghum stalks, cereal plant stalks, and wheat straw. The main component of straw is lignocellulose. The lignocellulose is a mixture of cellulose, hemicellulose and lignin. The cellulose, hemicellulose and lignin in the straw are c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10
CPCY02E50/16Y02E50/10
Inventor 袁敬伟刘甲申李春玲李杰岳国君邓立康
Owner COFCO GROUP
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