Method for preparing ethanol by raw materials containing cellulose

A cellulose and raw material technology, applied in the field of ethanol preparation, can solve the problems of low ethanol yield and low enzymatic hydrolysis efficiency, and achieve the effects of improved enzymatic hydrolysis efficiency, uniform reaction and stable reaction system

Active Publication Date: 2009-08-19
COFCO GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the defects of low ethanol yield and low enzymolysis efficiency of ethanol produced by the existing method for preparing ethanol from cellulose-containing raw materials, and provide an ethanol product with high ethanol yield and high enzymolysis efficiency Method for preparing ethanol from raw materials containing cellulose

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

[0061] This example is used to illustrate the method of the present invention for preparing ethanol by using cellulose-containing raw materials.

[0062] (1) Steam explosion

[0063] 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 sections of 1.5 cm × 0.2 cm × 0.5 cm, and a vertical macerator is used (Shandong Wenrui Machinery Co., Ltd. ) After mixing with water whose weight is one third of the weight of the corn stalk raw material, corn stalks with a water content of 40% by weight can be obtained. Take 1000 grams of corn stalks with a moisture content of 40% by weight, maintain them at a pressure of 1.8 MPa at 195° C. for 5 minutes, and then release the pressure to complete steam explosion. The resulting steam explosion bankruptcy was stirred and mixed with water at 70°C in a weight ratio of 1:3 for 30 minutes, and then solid-liquid separation...

Embodiment 2

[0082] This example is used to illustrate the method of the present invention for preparing ethanol by using cellulose-containing raw materials.

[0083] Ethanol was prepared according to the method of Example 1, except that 1000 grams of corn stalks with a moisture content of 50% by weight were cut into 1.3 cm × 0.4 cm × 0.8 cm sections, and maintained at a pressure of 1.8 MPa at 190°C. After 4 minutes, the pressure was released to complete the steam explosion. The obtained steam explosion bankruptcy was mixed with water at 65°C according to a mass ratio of 1:2 for 40 minutes, and then a centrifugal pump LW400 decanter centrifuge (Zhangjiagang Huada Centrifuge Manufacturing Co., Ltd. The company) carried out solid-liquid separation at 900 rpm to obtain a total of 2000 grams of steam explosion bankruptcy (water content of 75% by weight).

[0084] According to the method of HPLC analysis of sulfuric acid hydrolyzed steam explosion product described in Example 1, it is determined th...

Embodiment 3

[0087] This example is used to illustrate the method of the present invention for preparing ethanol by using cellulose-containing raw materials.

[0088] Ethanol was prepared according to the method of Example 1, except that 1000 grams of corn stalks with a water content of 35% by weight were cut into small sections of 1.2 cm × 0.4 cm × 0.7 cm, and maintained at a pressure of 1.7 MPa at 200°C. After 6 minutes, the pressure was released to complete the steam explosion. The resulting steam explosion bankruptcy was stirred and mixed with water at 75°C in a weight ratio of 1:2.5 for 50 minutes, and then solidified with a centrifugal pump LW400 decanter centrifuge (Zhangjiagang Huada Centrifuge Manufacturing Co., Ltd.) at 900 rpm. After liquid separation, a total of 2000 grams of solid steam explosion product (with a water content of 67.5% by weight) was obtained.

[0089] According to the method of HPLC analysis of sulfuric acid hydrolyzed steam explosion product described in Example ...

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Abstract

The invention relates to a method for preparing ethanol by adopting materials containing cellulose, which comprises the following steps: the materials containing cellulose is exploded by steam; the obtained steam explosion products are mixed with enzyme for enzymolysis; the enzymolysis products are obtained by fermentation; wherein, the method for mixing the steam explosion products and the enzyme comprises the following steps: a first batch of steam explosion products is firstly mixed with the enzyme to obtain mixture, and then the rest steam explosion products are continuously added into the mixture to be mixed with the obtained mixture; wherein, the adding speed of the rest steam explosion products ensures the concentration of the steam explosion products in the reaction system not to be higher than 150g/L; the weight of the first batch of steam explosion products mixed with the enzyme is 10-30wt% of the whole steam explosion products; and the liquid water content of the materials containing cellulose is 30-60 wt%. The method can effectively improve the saccharous conversion rate of the materials and the productivity of the ethanol, can greatly shorten the enzymolysis time and improve the enzymolysis efficiency as well.

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] 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 sugars to produce ethanol. [0003] Cellulose-containing raw materials are generally plant roots, stems and leaves, including straw. The stalks are roots, stems and leaves left after harvesting fruits of crops (generally herbaceous plants), mainly stems and leaves, such as corn stalks, sorghum stalks, stalks of cereal plants, and wheat stalks. 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 tightly combined...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12R1/84C12R1/865
CPCY02E50/16Y02E50/10
Inventor 刘甲申袁敬伟李春玲李杰孙长征于天杨
Owner COFCO GROUP
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