Pretreatment method of straw lignocelluloses raw material

A lignocellulose and pretreatment technology, which is applied in biofuel, fermentation and other directions, can solve the problems of high catalyst preparation cost and high solvent cost, and achieve the effect of promoting industrialization process, simple operation and low energy consumption

Inactive Publication Date: 2019-12-13
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to solve the technical problems of high catalyst preparation cost and high solvent cost in the existing method of using heteropoly acid to degrade lignin, and provides a method for pretreatment of straw lignocellulose raw materials

Method used

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  • Pretreatment method of straw lignocelluloses raw material
  • Pretreatment method of straw lignocelluloses raw material

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specific Embodiment approach 1

[0015] Specific embodiment one: the pretreatment method of the straw lignocellulose raw material of the present embodiment is carried out according to the following steps:

[0016] 1. Crush the air-dried straw into straw powder and dry to constant weight;

[0017] 2. Prepare H with distilled water 3 PW 12 o 40 aqueous solution, the straw powder and H 3 PW 12 o 40 Mix the solution evenly, place it in an open tray, then transfer the tray to a blast drying oven, heat up to 105-110°C for 1h-4h, and complete the first stage of heating treatment; then raise the temperature to 130°C-160°C Heating for 20min to 60min to complete the second stage of heating treatment;

[0018] 3. Cool down to room temperature after heating, take out the product, add distilled water to the product several times to stir, suction filter, collect solid residue and filtrate; wherein the solid residue is straw lignocellulose that has completed the pretreatment; add ether to the filtrate, Shake, collect...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the fineness of the straw powder in step 1 is 40-80 mesh; others are the same as Embodiment 1.

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the drying temperature in step 1 is 60-70° C.; the others are the same as Embodiment 1 or 2.

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Abstract

The invention relates to a pretreatment method of lignocelluloses, in particular to a pretreatment method of a straw lignocelluloses raw material, and aims to solve the technical problems of high catalyst preparation cost and high solvent cost of existing methods for degrading lignin by heteropoly acid. The method comprises the steps as follows: air-dried straw powder and a phosphotungstic acid aqueous solution are uniformly mixed and then subjected to two-stage heating, wherein the temperature at the first stage is 105 DEG C and the heating time is 1-4 h, and the temperature at the second stage is 130-160 DEG C and the heating time is 20-60 min; and then, suction filtration is performed, solid residues are pretreated straw lignocelluloses, and phosphotungstic acid is recovered after filtrate is collected. The method has the total sugar recovery rate of 70%-84% and catalyst recovery rate of 70%-80% and can be applied to the field of biomass pretreatment.

Description

technical field [0001] The invention relates to a method for pretreatment of lignocellulose. Background technique [0002] my country is a big agricultural country with abundant crop straw resources. With the transformation of agricultural production methods and the use of alternative products for energy consumption, the phenomenon of regional, seasonal and structural excess of straw resources has become increasingly prominent. Crop straw is rich in lignocellulose, and converting straw lignocellulose into fuel ethanol is an important way to efficiently utilize biomass resources. At present, the technology for producing first-generation fuel ethanol using grain as raw material is mature and stable, but when producing second-generation cellulosic ethanol using agricultural and forestry waste such as straw as raw material, due to the recalcitrant structural characteristics of straw lignocellulosic fibers, lignin and hemicellulose are tightly bound together. Wrapped in the out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10
CPCC12P7/10C12P2201/00Y02E50/10
Inventor 张盛明刘雨龙陈海涛于兴华金天浩梅铁瀚马凉非
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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