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Method for preparing ethanol from wood fiber raw material

A technology for lignocellulosic raw materials and ethanol, which is applied in the directions of biofuel and fermentation, can solve the problems of inoperable continuous processing, high equipment material requirements, serious environmental pollution, etc., and achieves increased effective specific surface area, low corrosion resistance requirements, and improved The effect of specific surface area

Active Publication Date: 2009-08-05
CHINA PETROCHEMICAL CORP +1
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  • Description
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the process of synthesizing ethanol from lignocellulosic raw materials, there are high energy consumption, high requirements on equipment materials, serious environmental pollution, and problems that cannot be processed continuously. A new method of synthesizing ethanol from lignocellulosic raw materials is provided method

Method used

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  • Method for preparing ethanol from wood fiber raw material
  • Method for preparing ethanol from wood fiber raw material

Examples

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Effect test

Embodiment 1

[0023] 400 grams of corn stalks are pressurized by a screw at 100°C and 2.5MPa, and instantly decompressed and puffed to obtain a porous fluffy material; The solution is washed to separate and remove lignin; the lignin-removed material is hydrolyzed with 10 FPIU / gram of cellulose niger at 43°C and pH=5 to obtain a sugar-containing solution with a concentration of 3.5% by weight; the above-mentioned sugar-containing The solution was fermented by 8 g / L Saccharomyces cerevisiae at 35°C under anaerobic conditions to obtain an ethanol solution with a concentration of 40 g / L; finally, the ethanol solution was rectified and concentrated to obtain ethanol with a purity of 95%.

[0024] The yields of each step are as follows: the yield of cellulose hydrolysis is 81.5%, the sugar utilization rate of sugar fermentation is 85.6%, the ethanol yield is 881.2%, the total sugar utilization rate is 45.2%, and the ethanol yield is 10.4%.

Embodiment 2

[0026]400 grams of rice straw are pressurized by a screw under the conditions of 120°C and 5MPa, and the porous fluffy material is obtained by instant decompression and puffing; The solution is washed to separate and remove the lignin; the lignin-removed material is hydrolyzed at 15 FPIU / gram of Trichoderma reesei cellulose at 53°C and pH=4.2 to obtain a sugar-containing solution with a concentration of 4.5% by weight; the above-mentioned The sugar solution is concentrated to 10% sugar at a temperature of 100°C; the above sugar solution is fermented by 8 g / L of Saccharomyces cerevisiae at 35°C under anaerobic conditions to obtain an ethanol solution with a concentration of 60 g / L ; Finally, the ethanol solution is rectified and concentrated to obtain ethanol with a purity of 95%.

[0027] The yields of each step are as follows: cellulose hydrolysis yield 83.7%, sugar fermentation sugar utilization rate 88.5%, ethanol yield 81.9%, total sugar utilization rate 47.6%, ethanol yie...

Embodiment 3

[0029] 400 grams of wheat straw are pressurized by a screw under the conditions of 125°C and 5MPa, and the porous fluffy material is obtained by instant decompression and puffing; Carry out washing to separate and remove lignin; the lignin-removed material is hydrolyzed with 15 FPIU / gram of cellulose Trichoderma reesei at 50°C and pH=4.2 to obtain a sugar-containing solution with a concentration of 4.5% by weight; the above-mentioned sugar-containing The solution is concentrated by nanofiltration membrane at room temperature and membrane entry pressure of 2.0 MPa, and concentrated to 10% sugar content; the above sugar solution is fermented by 8 g / L Saccharomyces cerevisiae at 35 °C under anaerobic conditions to obtain ethanol solution, its concentration is 68 g / L; finally the ethanol solution is rectified and concentrated to obtain ethanol with a purity of 95%.

[0030] The yields of each step are as follows: the yield of cellulose hydrolysis is 85.2%, the sugar utilization ra...

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Abstract

The invention relates to a method for preparing ethanol by wood fibre raw materials, which mainly solves the problem that the ethanol synthesized by the existing wood fibre raw materials has high energy consumption, high requirements for equipment material and severe environmental pollution, and is incapable of processing continuously. The wood fibre raw materials are pressed by a screw rod and expanded with instant decompression so as to obtain porous fluffy materials; aqueous slkali is added into the porous fluffy materials for washing and realizing the first separation of xylogen; the xylogen-separated materials are hydrolyzed by cellulase so as to obtain sugar-containing solution; ethanol solution is obtained by fermenting the sugar-containing solution; and the ethanol with the purity of 95 percent is obtained by regular distillation and purification. The method can be applied to the industrial production of preparing ethanol by wood fibre raw materials.

Description

technical field [0001] The invention relates to a method for preparing 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 future. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/06
CPCY02E50/17Y02E50/10
Inventor 高志刚缪晡石荣华罗翔明林长骏李陈江
Owner CHINA PETROCHEMICAL CORP
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