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Process for producing fuel alcohol by adopting straw lignocellulose as raw material

A technology of lignocellulose and fuel ethanol, applied in biofuels, methods based on microorganisms, microorganisms, etc., can solve the problems of increased process complexity and cost, many by-products of hydrolysis and saccharification technology, and lack of conditions for industrialization. Ensure efficient operation, good pretreatment effect, and reduce the effect of sugar and ethanol concentration

Inactive Publication Date: 2012-06-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the complex structure of straw-based lignocellulose, it is limited by the current technical level, such as the high cost of pretreatment technology, and the by-products are harmful to the environment.
Although the steam explosion method can achieve a better pretreatment effect, there are still many problems, and it does not yet have the conditions for industrialization; although the wet oxidation method pretreatment consumes less energy, the cost is very high; H 2 SO 4 Concentrated acid pretreatment methods such as HCl and HCl are highly corrosive and will pollute the environment; dilute acid treatment has high efficiency, but it needs to be carried out under high temperature and high pressure, and the utilization rate of raw materials is low, and the cost is high
Hydrolysis and saccharification technology has more by-products and greater pollution
Dilute acid hydrolysis needs to be carried out under high temperature and high pressure. The hydrolyzate becomes acidic and needs to be neutralized. The cost is high, and there are many by-products, which can inhibit the subsequent fermentation process; It is highly corrosive and requires high equipment, and later separation and recovery increase the complexity and cost of the process

Method used

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  • Process for producing fuel alcohol by adopting straw lignocellulose as raw material
  • Process for producing fuel alcohol by adopting straw lignocellulose as raw material
  • Process for producing fuel alcohol by adopting straw lignocellulose as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Crushing of wheat straw

[0032] Use a crusher to crush the wheat straw to 80 meshes, and dry and store at 55°C;

[0033] (2) 1.0% NaOH solution pretreatment

[0034] Weigh 200 g of crushed and dried wheat straw powder, add 4 L of NaOH solution with a mass fraction of 1.0% to it, control the solid-liquid ratio to 1:20, stir evenly; and keep the temperature at 121 ° C and a pressure of 0.2 MPa for 50 min, After cooling to room temperature, add an appropriate amount of distilled water for centrifugation, set the speed of the centrifuge to 4000r / min, and centrifuge for 15min each time. The supernatant after this centrifugation can be reused after adding an appropriate amount of NaOH. The precipitate was washed with distilled water until the centrifuged supernatant was neutral; the centrifuged wheat straw precipitate was dried at 105°C. After drying, use a crusher to crush to 80 mesh, and store at 55°C until use.

[0035] The changes of lignin, hemicellulose and cel...

Embodiment 2

[0042] (1) Crushing of straw straw

[0043] Use a crusher to crush the straw-like lignocellulose to 80 meshes, and dry and store at 55°C;

[0044] (2) 1.0% NaOH solution pretreatment

[0045] Weigh 2.4Kg of crushed and dried rice straw powder, add 48L of NaOH solution with a mass fraction of 1.0% to it, control the solid-liquid ratio to 1:20, stir evenly; and keep at 121°C and a pressure of 0.2MPa for 50min , after cooling to room temperature, add an appropriate amount of distilled water to centrifuge, set the speed of the centrifuge to 4000r / min, and centrifuge for 15min each time. The supernatant after this centrifugation can be reused after adding an appropriate amount of NaOH. The precipitate was washed with distilled water until the centrifuged supernatant was neutral; the centrifuged rice straw precipitate was dried at 105°C. After drying, use a crusher to crush to 80 mesh, and store at 55°C until use.

[0046] The changes of lignin, hemicellulose and cellulose compo...

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Abstract

The invention relates to a process for producing fuel alcohol by adopting straw lignocellulose as a raw material, which comprises the following steps of: (1) crushing of the straw lignocellulose: crushing the straw lignocellulose by using a crushing machine to 80 meshes and drying at the temperature of 55 DEG C to obtain a straw lignocellulose powder; (2) fetching the crushed and dried straw lignocellulose powder, and adding a sodium hydroxide (NaOH) solution of which the mass fraction is 1.0 percent to the straw lignocellulose powder for pretreatment; (3) cellulose hydrolysis saccharification: adding the cellulose to the straw lignocellulose powder prepared in the step (2); and stirring for hydrolysis for 48 hours under the condition that the temperature is 40 DEG C and pH is 4.5 to obtain cellulose hydrolysis saccharification hydrolysate; and (4) alcoholic fermentation: lowering the temperature of the cellulose hydrolysis saccharification hydrolysate to 35 DEG C in a fermentation tank, and adding 2g / L of yeast to perform a constant-temperature fermentation reaction to obtain the fuel alcohol. Compared with the prior art, the process for producing the fuel alcohol by adopting the straw lignocellulose as the raw material has the advantages of rich raw material, low cost, high hydrolysis efficiency, fewer byproducts, high alcohol yield and the like.

Description

technical field [0001] The invention relates to a production process of ethanol, in particular to a process for producing fuel ethanol by using straw lignocellulose as a raw material. Background technique [0002] Petroleum is the most important raw material for energy and chemical products in the world. However, with the continuous economic development of countries around the world, especially the rapid economic development of developing countries in recent years, the demand for fossil fuels such as petroleum is also increasing. However, with the depletion of the world's oil and other resources, the rising price of crude oil, and the continuous improvement of people's requirements for environmental quality, and the increasing environmental pressure, the development and utilization of green, environmentally friendly and sustainable energy has become an The objective needs of sustainable development. The development and utilization of green, environmentally friendly and sust...

Claims

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Application Information

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IPC IPC(8): C12P7/10C12R1/865
CPCY02E50/16Y02E50/10
Inventor 林燕张伟
Owner SHANGHAI JIAO TONG UNIV
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