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Method for carrying out pressurization microwave pretreatment on lignocellulose

A technology of lignocellulose and microwave treatment, applied in biofuels, fermentation, etc., can solve the problems of low conversion rate of reducing sugar, large water consumption, high energy consumption, etc., and achieve short reaction time, cost saving, and low energy consumption Effect

Inactive Publication Date: 2011-10-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of large water consumption, high cost, high energy consumption and low conversion rate of reducing sugar in the existing lignocellulose used as alcohol raw material in its pretreatment method, and to provide a pressurized microwave pretreatment wood cellulosic method

Method used

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  • Method for carrying out pressurization microwave pretreatment on lignocellulose
  • Method for carrying out pressurization microwave pretreatment on lignocellulose

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specific Embodiment approach 1

[0014] Specific Embodiment 1: The method for pressurized microwave pretreatment of lignocellulose in this embodiment is carried out according to the following process: take 4 to 6 g of lignocellulose that has been dried to constant weight, grind it into powder of 10 to 40 mesh, and then Add distilled water at 1:5-20, and pressurize microwave treatment for 2-15 minutes at a temperature of 110-150°C to complete pressurized microwave pretreatment of lignocellulose; the pressure used for pressurized microwave treatment is 0.1-0.5MPa, The microwave frequency used was 450 MHz.

[0015] The type of microwave processor used in the microwave pretreatment in this embodiment is the Mars5 high-throughput closed microwave digestion system (microwave digestion instrument) produced by the American CEM company, and the microwave frequency is 450 MHz.

[0016] In this embodiment, after the pressurized microwave treatment, washing and filtering are not required.

specific Embodiment approach 2

[0017] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the lignocellulose is one or a combination of sugarcane, rice husk, and straw. Other steps and parameters are the same as those in Embodiment 1.

[0018] In this embodiment, when the lignocellulose is a mixture, each component is mixed in any proportion.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that 4 g of lignocellulose dried to constant weight is taken, crushed into 10-mesh powder, and then distilled water is added at a solid-to-liquid ratio of 1:5. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for carrying out pressurization microwave pretreatment on lignocellulos, relates to a method for treating lignocellulose, and solves the problems of large water consumption, high cost and energy consumption as well as low conversion rate of reducing sugar of the existing methods for pretreating the lignocellulose. The method comprises the following steps of: obtaining and pulverizing lignocellulose which is dried to constant weight, adding distilled water and finally carrying out pressurization microwave treatment. The method achieves the purposes of shortening treatment time, reducing water consumption, cost and energy consumption during production, avoiding secondary pollution and being easily applicable to industry. The method achieves milder condition of pressurization microwave pretreatment in comparison with other pretreatment methods, low requirement on reaction temperature and pressure (reaction temperature: 110-150 DEG C, the pressure: 0.1-0.5 MPa), high safety, low energy consumption, no need of chemical reagent, short reaction time (only 2 to 15 min) and cost saving.

Description

technical field [0001] The invention relates to a method for treating lignocellulose. Background technique [0002] Lignocellulose is one of the most abundant and cheapest renewable resources on earth, and is considered to be the most important follow-up resource substance for fuel ethanol production. However, the structure of cellulosic substances is complex, and it is difficult for cellulase to enter the crystallization region of cellulose, making it difficult to rapidly biodegrade cellulose. Therefore, people have to use chemical and physical methods for pretreatment to separate cellulose from lignin and hemicellulose, undo the internal hydrogen bonds of cellulose, and convert crystalline cellulose into amorphous cellulose, so that after pretreatment The resulting material is more susceptible to hydrolysis by biological or chemical means. [0003] Existing various pretreatment methods and processes are too costly and consume too much energy. Although the technical princ...

Claims

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Application Information

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IPC IPC(8): C12P7/10
CPCY02E50/10
Inventor 冯玉杰李冬梅刘玉蕾
Owner HARBIN INST OF TECH
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