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Method for preparing ethanol from raw material containing cellulose

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: 2013-05-15
COFCO GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defect that the ethanol production rate obtained by the existing method for preparing ethanol from cellulose-containing raw materials is relatively low, and provide a method for preparing ethanol using cellulose-containing raw materials with high ethanol production rate

Method used

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  • Method for preparing ethanol from raw material containing cellulose
  • Method for preparing ethanol from raw material containing cellulose
  • Method for preparing ethanol from raw material 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 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 is 20% by weight measured according to the above method. The raw material is cut into small sections of 1.5 cm × 0.2 cm × 0.5 cm, and a vertical macerator (Shandong Wenrui Machinery Co., Ltd. ) Is mixed with water whose weight is one third of the weight of the corn stalk raw material and soaked to obtain corn stalks with a water content of 40% by weight. Take 1000 grams of corn stalks with a moisture content of 40% by weight and maintain them at a pressure of 1.8 MPa at 195°C for 5 minutes, and then release the pressure to complete the steam explosion. The resulting steam explosion bankruptcy was stirred and mixed with water at 70°C at a weight ratio of 1:3 for 30 minutes, and then solid-liquid with a LW400 deca...

Embodiment 2

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

[0083] (1) Steam explosion

[0084] Take 1000 grams of corn stalks with a moisture content of 50% by weight, cut them into 1.3 cm × 0.4 cm × 0.8 cm sections, maintain at 190°C at a pressure of 1.7 MPa for 4 minutes, then release the pressure and complete the steam explosion. 1250 grams of steam explosion product (60% by weight water content).

[0085] According to the method for HPLC analysis of sulfuric acid hydrolyzed steam explosion products described in Example 1, it was determined that 1,250 g of steam explosion products contained 213 grams of cellulose and 63 grams of hemicellulose.

[0086] (2) Enzymatic hydrolysis

[0087] Enzymatically hydrolyze the above-mentioned unwashed steam explosion product according to the method of Example 1. The difference is that after adding water to the enzymolysis tank and stirring, the steam explosion pr...

Embodiment 3

[0090] This example is used to illustrate the method of the present invention for preparing ethanol using cellulose-containing raw materials.

[0091] (1) Steam explosion

[0092] Take 1000 grams of corn stalks with a moisture content of 40% by weight, cut them into 1.2 cm × 0.4 cm × 0.7 cm sections, maintain the pressure at 1.7 MPa at 200° C. for 6 minutes, and then release the pressure to complete steam explosion. The resulting steam explosion bankruptcy was 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 (water content of 70% by weight) was obtained.

[0093] According to the method of HPLC analysis of sulfuric acid hydrolyzed steam explosion product described in Example 1, it was determined that 2000 g of steam explosion product contained 260 gra...

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Abstract

The invention relates to a method for preparing ethanol with a raw material containing cellulose; the method comprises the following steps: the ram material containing cellulose is blasted by steam; the obtained steam blasting product is mixed with enzyme to have zymohydrolysis; a zymohydrolysis product is obtained by fermentation, wherein, the method for mixing the steam blasting product and theenzyme comprises mixing the steam blasting product with the enzyme by at least two batches; the amount of each batch of steam blasting product added in is at most 60 percent of the weight of all the steam blasting product; the water content of the raw material containing cellulose is 30 weight percent to 60 weight percent. The yield of the ethanol prepared by the method is quite high.

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 the 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 com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/06
CPCY02E50/17Y02E50/10
Inventor 王国忠姜开荣谢成华孙长征岳国君林海龙邓立康
Owner COFCO GROUP