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Method for producing ethanol by using wood fiber raw material

A technology for lignocellulosic raw materials and ethanol, which is applied in the directions of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of low yield of total sugar, etc., and achieves the improvement of ethanol concentration, utilization rate of total sugar, and residence time. short effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low total sugar yield in the prior art, and a new method for producing ethanol by using lignocellulosic raw materials is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In the first stage of the three-stage screw extruder, 500 grams of corn stover was pulverized, and then continuously impregnated with 1.5% dilute sulfuric acid at 60°C for a residence time of 7 minutes, extruded, dehydrated and preliminarily expanded. In the second stage of the three-stage screw extruder, the dehydrated corn stover was maintained at 160° C. and 0.7 MPa for 20 minutes. In the third stage of the three-stage screw extruder, the cooked material is extruded, steamed and exploded by the screw, and instantly decompressed and puffed to obtain a porous, fluffy and wet material. After adding water to the above-mentioned porous fluffy wet material (the dry matter concentration ratio is 17%), the concentration of penicillin added is 3×10 -4 g / L, the temperature is controlled at 55°C, and under the condition of pH=5.0, cellulase is added in an amount of 0.14 g / g cellulose, and enzymatic hydrolysis obtains an enzymatic hydrolysis solution containing pentose, hexose a...

Embodiment 2

[0027] In the first stage of the three-stage screw extruder, 500 grams of wheat straw was pulverized, and then continuously impregnated with 1.5% dilute sulfuric acid at 60°C. After a residence time of 9 minutes, it was extruded, dehydrated and preliminarily expanded. In the second stage of the three-stage screw extruder, the dehydrated wheat straw was maintained at 170° C. and 0.8 MPa for 18 minutes. In the third stage of the three-stage screw extruder, the cooked material is extruded, steamed and exploded by the screw, and instantly decompressed and puffed to obtain a porous, fluffy and wet material. After the above-mentioned porous fluffy wet material is added with water (the dry matter concentration ratio is 26%), the concentration of penicillin added is 3×10 -4 g / L, the temperature is controlled at 55°C, and under the condition of pH=4.5, cellulase is added in an amount of 0.15 g / g cellulose, and enzymatic hydrolysis obtains an enzymatic hydrolysis solution containing pen...

Embodiment 3

[0030] In the first stage of the three-stage screw extruder, 500 grams of rice straw was pulverized, then continuously impregnated with 1.5% dilute sulfuric acid at 60°C, and after a residence time of 8 minutes, extruded, dehydrated and preliminarily expanded. The dehydrated rice straw in the second stage of the three-stage screw extruder was maintained at 170° C. and 0.8 MPa for 25 minutes. In the third stage of the three-stage screw extruder, the cooked material is extruded, steamed and exploded by the screw, and instantly decompressed and puffed to obtain a porous, fluffy and wet material. After the above-mentioned porous fluffy wet material is added with water (the dry matter concentration ratio is 25%), the concentration of penicillin added is 3×10 -4 g / L, the temperature is controlled at 55°C, and under the condition of pH=4.5, cellulase is added in an amount of 0.14 g / g cellulose, and enzymatic hydrolysis obtains an enzymatic hydrolysis solution containing pentose, hexo...

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Abstract

The invention relates to a method for producing ethanol by using wood fiber raw materials, mainly aiming at solving the problem of low total sugar yield existing in the prior art. The method comprises the following steps of: 1) crushing the wood fiber raw materials, effectively and continuously dipping the crushed wood fiber raw materials by using dilute acid at 20-80DEG C, keeping retention time to be 1-15 minutes and then conducting dehydration; 2) processing the dehydrated materials for 1-35 minutes under conditions that the temperature is 80-200DEG C and the pressure is 0.4-10MPa; 3) adding water into the materials obtained in the step 2 to prepare mixture with the required dry matter concentration, and hydrolyzing the mixture for 8-120 hours through cellulase under the conditions that the temperature is 30-70DEG C and the pH (potential of hydrogen) is 1-7 to obtain enzymatic hydrolysate which contains pentose, hexose and lignin; 4) removing the lignin in the enzymatic hydrolysate obtained in the step 3 to obtain solution which contains the pentose and hexose; 5) concentrating the solution containing the pentose and hexose obtained in the step 4, and co-fermenting the concentrated solution for 8-120 hours through zymophyte under anaerobic conditions that the temperature is 20-45DEG C and the pH is 3-8 to obtain fermented mash which contains ethanol; and 6) concentrating the fermented mash obtained in the step 5 to obtain the ethanol with purity being 95 percent. By adopting the technical scheme, the problem is better solved and the method can be used for the industrial production of the ethanol by using the wood fiber raw materials.

Description

technical field [0001] The invention relates to a method for producing ethanol by utilizing lignocellulosic raw materials. Background technique [0002] The crises of energy, resources and environment in the 21st century have become the main obstacle to the development of human civilization. People are working hard to find new energy sources to replace fossil fuels to reduce dependence on non-renewable energy sources, control carbon dioxide emissions, and protect the ecological environment. Lignocellulosic raw materials are the most productive renewable resources on earth, including forest trees, crop straws, and scraps from agricultural and sideline products processing. At present, most of these resources are wasted in vain, except for a few used in pulp and paper, construction, textile, feed and other industries. Therefore, developing a process for preparing ethanol from lignocellulosic raw materials is the development direction of ethanol production in the future. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12P19/14C12R1/84C12R1/865C12R1/72
CPCY02E50/10
Inventor 缪晡杜军陈栋丁伟军罗翔明
Owner CHINA PETROLEUM & CHEM CORP