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Method for producing ethanol by wood fiber raw material

A technology of lignocellulosic raw materials and ethanol, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of low yield of total sugar, increase the concentration of ethanol, improve the utilization rate of total sugar, and increase the 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 from lignocellulosic raw materials is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the first stage of the three-stage screw extruder, 500 grams of corn stalks were pulverized, then continuously impregnated with 1.5% dilute sulfuric acid at 60°C, with a residence time of 7 minutes, extruded, dehydrated and preliminarily expanded. In the second stage of the three-stage screw extruder, the dehydrated corn stalks were maintained at 160° C. and 0.7 MPa for 20 minutes. In the third section of the three-section screw extruder, the cooked material is steamed and exploded by screw extrusion, and instantly decompressed and puffed to obtain a porous and fluffy wet material. The obtained porous and fluffy wet material is washed with water at a liquid-solid ratio of 5:1 at 60°C to obtain a pentose solution and a material containing cellulose and lignin, and the pentose solution is concentrated to obtain a pentose concentration of 40.69 g / L ; The concentrated pentose solution is transferred to the fermenter, and the concentration of urea added is 0.3 grams per l...

Embodiment 2

[0028] In the first section of the three-section screw extruder, 500 g of wheat straw was crushed, then impregnated continuously with 1.5% dilute sulfuric acid at 60°C, and after a residence time of 9 minutes, it was extruded, dehydrated and preliminarily puffed. 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 section of the three-section screw extruder, the cooked material is steamed and exploded by screw extrusion, and instantly decompressed and puffed to obtain a porous and fluffy wet material. The obtained porous and fluffy wet material is washed with water at a liquid-solid ratio of 5:1 at 60°C to obtain a pentose solution and a material containing cellulose and lignin; the pentose solution is concentrated to obtain a pentose concentration of 37.57 grams per liter ; The concentrated pentose solution is transferred to the fermenter, and the concentration of urea added is 0....

Embodiment 3

[0031] In the first stage of the three-stage screw extruder, 500 grams of rice straw was crushed, 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 section of the three-section screw extruder, the cooked material is steamed and exploded by screw extrusion, and instantly decompressed and puffed to obtain a porous and fluffy wet material. The obtained porous and fluffy wet material is washed with water at a liquid-solid ratio of 5:1 at 60°C to obtain a pentose solution and a material containing cellulose and lignin; the pentose solution is concentrated to obtain a pentose concentration of 34.91 g / L ; The concentrated pentose solution is transferred to the fermenter, and the concentration of urea added is 0.3 grams per liter, a...

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Abstract

The invention relates to a method for producing ethanol by a wood fiber raw material, which mainly solves the problem of low total sugar yield rate in the prior art. Aiming at well solving the problem, the method adopts the technical scheme that the method comprises the following steps of (1) crushing the wood fiber raw material, and effectively and continuously impregnating the wood fiber raw material with dilute acid at the temperature of 20 to 80 DEG C, maintaining for 1 to 15 minutes, and dehydrating; (2) treating the dehydrated material for 1 to 35 minutes at the temperature of 80 to 200 DEG C and the pressure of 0.4 to 10 MPa; (3) carrying out instantaneous depressurizing and blasting on the material treated in step (2), so as to obtain a porous fluffy wet material containing pentose; (4) washing the porous fluffy wet material containing the pentose to obtain a pentose solution, and a material containing cellulose and lignin; (5) adding water into the material containing the cellulose and the lignin, so as to prepare into the required concentration of a dry matter, and hydrolyzing by a cellulase to obtain an enzymatic hydrolyzate containing hexose; (6) fermenting the enzymatic hydrolyzate containing the hexose to obtain a fermented liquor A containing ethanol; (7) fermenting the pentose solution to obtain a fermented liquor B containing ethanol; and (8) mixing the fermented liquor A and the fermented liquor B, and concentrating to obtain the ethanol with the purity of 95%. The method can be used for the industrial production of the ethanol produced by the wood fiber raw material.

Description

technical field [0001] The present invention relates to a method for producing ethanol from lignocellulosic raw materials. Background technique [0002] In the 21st century, the crises of energy, resources and environment have become the main obstacles to the development of human civilization. People are trying to find new energy sources to replace fossil fuels in order 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 the earth, including forest trees, crop straws, and leftovers from agricultural and sideline product processing. At present, most of these resources are wasted except for a few used in industries such as pulp and paper, construction, textiles, and fodder. Therefore, the development of ethanol production process from lignocellulosic raw materials is the development direction of ethanol production in the fut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10C12R1/885C12R1/685C12R1/865C12R1/01C12R1/84C12R1/72
CPCY02E50/10
Inventor 陈栋缪晡丁伟军罗翔明杜军
Owner CHINA PETROLEUM & CHEM CORP
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