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Method for producing ethanol by wood fiber raw material

A technology for lignocellulosic raw materials and ethanol, which is applied in the field of ethanol production from lignocellulosic raw materials, can solve the problems of low total sugar yield and the like, and achieve the effects of continuous operation, improving total sugar utilization rate, and improving total sugar yield.

Active Publication Date: 2015-01-07
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 from lignocellulosic raw materials is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In the first stage of the three-stage screw extruder, 500 grams of corn stalks are crushed, and then continuously immersed in 1.3% dilute sulfuric acid at 60° C., with a residence time of 7 minutes, extrusion, dehydration and preliminary expansion. In the second stage of the three-stage screw extruder, the dehydrated corn stover is maintained at 160°C and 0.7MPa for 20 minutes. In the third section of the three-section screw extruder, the steamed material is extruded by the screw and exploded, and it is instantly decompressed and expanded to obtain a porous, fluffy wet material. After adding water to the above porous and fluffy wet material (the dry matter concentration ratio is 19%), the concentration of penicillin is 3×10 -4 G / L, temperature control at 55°C, pH=5.0, adding cellulase at an amount of 0.12 g / g cellulose, enzymatic hydrolysis to obtain an enzymatic hydrolysate containing pentose and hexose. The obtained enzymatic hydrolysate containing pentose and hexose i...

Embodiment 2

[0026] In the first stage of the three-stage screw extruder, 500 grams of wheat straw is crushed, and then continuously immersed in 1.3% dilute sulfuric acid at 60°C. After a residence time of 9 minutes, it is extruded, dehydrated and initially expanded. In the second stage of the three-stage screw extruder, the dehydrated wheat straw is maintained at 170°C and 0.8MPa for 18 minutes. In the third section of the three-section screw extruder, the steamed material is extruded by the screw and exploded, and it is instantly decompressed and expanded to obtain a porous, fluffy wet material. After adding water to the above porous and fluffy wet material (the dry matter concentration ratio is 23%), add penicillin to a concentration of 3×10 -4 G / L, the temperature is controlled at 55°C, and the cellulase is added at a dosage of 0.12 g / g cellulose under the condition of pH=4.5, and the enzymatic hydrolysis solution contains pentose and hexose. The obtained enzymatic hydrolysate containin...

Embodiment 3

[0029] In the first stage of the three-stage screw extruder, 500 grams of rice straw are crushed, and then continuously immersed in 1.3% dilute sulfuric acid at 60°C. After a residence time of 8 minutes, the extrusion, dehydration and preliminary expansion are carried out. The rice straw dehydrated in the second stage of the three-stage screw extruder was maintained at 170°C and 0.8MPa for 25 minutes. In the third section of the three-section screw extruder, the steamed material is extruded by the screw and exploded, and it is instantly decompressed and expanded to obtain a porous, fluffy wet material. After adding water to the above porous and fluffy wet material (the dry matter concentration ratio is 23%), add penicillin to a concentration of 3×10 -4 G / L, the temperature is controlled at 55°C, and the cellulase is added at a dosage of 0.12 g / g cellulose under the condition of pH=4.5, and the enzymatic hydrolysis solution contains pentose and hexose. The obtained enzymatic hyd...

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Abstract

The invention relates to a method for producing ethanol by the wood fiber raw material, and solves the problem of low total sugar yield in the prior art. The method for producing ethanol by the wood fiber raw material comprises the following steps of: 1) smashing the wood fiber raw material, effectively and continuously dipping in dilute acid at the temperature of 20-80DEG C, staying for 1-15 minutes, and dewatering; 2) processing the dewatered material under the condition that the temperature is 80-200DEG C and the pressure is 0.4-10MPa for 1-35 minutes; 3) adding water into the material obtained in step 2), blending into required dry matter density, and hydrolyzing by the cellulose for 8-120 hours to obtain enzymatic hydrolysate under the condition that the temperature is 30-70DEG C and pH (potential of hydrogen) is 1-7; 4) carrying out zymophyte co-fermentation for 8-120h under the anaerobic condition that the temperature is 20-45DEG C and the pH is 3-8 to obtain fermentation mash containing ethanol; and 5) after the fermentation mash is subjected to concentration extraction, obtaining the ethanol of which the purity is 95%. According to the technical scheme, the problem is better solved, and the method for producing ethanol by the wood fiber raw material can be used for the industrial production for producing the ethanol by the wood fiber raw material.

Description

Technical field [0001] The invention relates to a method for producing ethanol from wood fiber raw materials. Background technique [0002] The energy, resource, and environmental crises faced by the 21st century have become the main obstacles to the development of human civilization. People are working hard to find new energy sources that replace fossil fuels to reduce dependence on non-renewable energy sources, control carbon dioxide emissions, and protect the ecological environment. Wood fiber raw materials are the most productive renewable resources on the planet, including forest trees, crop stalks, and leftovers from processing agricultural and sideline products. 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, the development of lignocellulosic raw materials to produce ethanol is the future direction of ethanol production. [0003] The process of preparing ethanol ...

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
CPCY02E50/16Y02E50/10
Inventor 缪晡丁伟军陈栋罗翔明杜军
Owner CHINA PETROLEUM & CHEM CORP