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Pretreatment method for biorefinery of lignocellulose

A technology of lignocellulose and biorefining, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of not meeting the requirements of ecological environment, affecting the effect of cellulose hydrolysis, serious environmental pollution, etc., achieving low cost and improving efficiency , The effect of simple process

Inactive Publication Date: 2010-06-16
ANGELYEAST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Acidic pretreatment requires a large amount of dilute acid, which causes serious environmental pollution and does not meet the requirements of the ecological environment. At the same time, because lignocellulose is processed under acidic conditions, it is easy to produce furfural and other by-products that are not conducive to the yeast fermentation process, making it completely detoxified. The process is complicated and the cost is high; the main feature of the steam explosion method is that the cost of steam explosion pretreatment is low and the effect is obvious, but because the lignin is not removed in this treatment process, it affects the enzymatic hydrolysis effect of cellulose in the later stage

Method used

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  • Pretreatment method for biorefinery of lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Dry 1 kg of wheat straw, clean the soil, crush it to a particle size of 80-100 mesh, add 7 kg of water to make a slurry, put it into a pressure vessel for a catalytic hydrolysis reaction, and control the reaction temperature at 140 ° C. for 50 minutes. The reacted material is filtered and dried, and the filtrate is collected. After the filtrate is concentrated, it is used for fermenting ethanol or preparing five-carbon sugar, and the recovery rate of the five-carbon sugar is 91.3%. After the solid part after a catalytic hydrolysis reaction is dried, add 45g of calcium carbonate, feed oxygen or air, control the pressure at 15 atmospheres, and treat it for 30 minutes under the action of steam at 150°C, release the pressure quickly, and collect the slurry. The reacted material is filtered, and the liquid after alcohol washing is distilled under reduced pressure to recover ethanol. The filtered liquid part adjusts the pH to below 7, collects the solid after precipitation, ...

Embodiment 2

[0053] Dry 1 kg of rice stalks in the air, wash the soil, crush until the particle size is 50 mesh, add 8 kg of water to make a slurry, and put it into a pressure vessel for a catalytic hydrolysis reaction. The reaction temperature is controlled at 160°C and the reaction time is 60 minutes. . The reacted material is filtered and dried, and the filtrate is collected. After the filtrate is concentrated, it is used for fermenting ethanol or preparing five-carbon sugar, and the recovery rate of the five-carbon sugar is 92.1%. After the solid part after a catalytic hydrolysis reaction was dried, 72g of lithium carbonate was added, oxygen was introduced, the pressure was controlled at 8 atmospheres, and under the action of steam at 140°C, it was treated for 70 minutes, and the pressure was released quickly to collect the slurry. The reacted material is filtered, and the liquid after alcohol washing is distilled under reduced pressure to recover ethanol. The filtered liquid part adj...

Embodiment 3

[0055] Dry 1 kg of pine wood chips, clean the soil, crush until the particle size is 90 mesh, add 7 kg of water to make a slurry, and put it into a pressure vessel for a catalytic hydrolysis reaction. The reaction temperature is controlled at 170 ° C and the reaction time is 70 minutes. . The reacted material is filtered and dried, and the liquid is collected and concentrated for use in fermenting ethanol or preparing five-carbon sugar, and the recovery rate of the five-carbon sugar is 93.5%. After the solid part after a catalytic hydrolysis reaction was dried, 55g of sodium carbonate was added, oxygen was introduced, the pressure was controlled at 10 atmospheres, and under the action of steam at 160°C, it was treated for 40 minutes, and the pressure was released quickly to collect the slurry. The reacted material is filtered, and the liquid after alcohol washing is distilled under reduced pressure to recover ethanol. The filtered liquid part adjusts the pH to below 3, collec...

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Abstract

The invention relates to a pretreatment method for biorefinery of lignocellulose, comprising the following steps: preparing five carbon sugar and a small amount of six carbon sugar which are used for fermenting in the steps of enabling the raw material of lignocellulose to be subjected to the autocatalytic hydrolysis reaction at medium temperature for one time, filtering, washing and concentrating, and preparing lignose and cellulose in the steps of enabling the five carbon sugar and the six carbon sugar to be subjected to the basic carbonate catalytic degradation reaction, filtering, washing, reducing pressure and steaming. Because the carbonate is used as the catalyst, the lignose can be effectively removed from the biomass of the lignocellulose, the cellulose enzymolysis efficiency can be improved and the cellulosic ethanol production cost can be reduced. The method for preprocessing and biologically refining the lignocellulose can ensure that 90 percent of the five carbon sugar, more than 91 percent of lignose and more than 93 percent of cellulose can be recovered, and in addition, the method for preprocessing and biologically refining the lignocellulose has low cost, needs no strong base or strong acid and is simple and environmental friendly.

Description

technical field [0001] The invention relates to the technical field of bioenergy development, relates to the biological preparation technology of cellulosic ethanol, in particular to a pretreatment method of lignocellulose biorefining, which is used to provide raw materials and high value-added products for producing cellulosic ethanol. Background technique [0002] With the depletion of petroleum resources, the rise of petroleum prices and the deterioration of the environment, it has become a research hotspot in the field of industrial biotechnology to find new renewable resources to replace fossil resources and to develop clean energy. The development of biomass energy can alleviate the dependence on petroleum resources, control carbon dioxide emissions, and promote the development of new agricultural industrial chains, which is of great significance to promote the construction of new socialist countryside in our country. [0003] As a renewable and clean energy, fuel etha...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 俞学锋李知洪余明华姚鹃龚大春李志军曾晶雷锦成
Owner ANGELYEAST CO LTD
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