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Preprocessing method for lignocellulose raw material

A lignocellulose and pretreatment technology, applied in the field of agricultural and forestry biomass resource utilization, can solve the problems of high cost, waste of resources, and high price of cellulase, achieve high hydrolysis rate and recovery rate, speed up the industrialization process, and improve the The effect of development prospects

Active Publication Date: 2013-01-09
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the recalcitrant characteristics of lignocellulose, the low yield of cellulase hydrolysis and the high price of cellulase, it is an effective solution to the current constraints on lignocellulose biorefining to seek a pretreatment technology that improves the efficiency of enzymatic hydrolysis and saccharification and reduces the cost of enzyme use. The technical bottleneck of the critical pathway
[0004] There are following deficiencies in the existing pulping and papermaking methods: (1) in the traditional pulping process, mainly utilize the cellulose in the plant fiber raw material, and most of hemicellulose and lignin will be dissolved in the cooking waste when cooking. (2) Transforming an existing pulp and paper mill into a biomass refinery is not only a technological innovation, but also an innovation in the way of thinking. It may take some time for pulp and paper mills that focus on producing traditional paper and board products to accept this new production model
Not only the steps are cumbersome, the cost is high, but also a large amount of organic matter is used, which is not environmentally friendly

Method used

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  • Preprocessing method for lignocellulose raw material
  • Preprocessing method for lignocellulose raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Fully mix the lignocellulosic raw material (shrub red willow) crushed to 40-60 mesh with water at a mass ratio of 1:10, let it stand for 4 hours, then transfer the mixture to a high-pressure reactor, Under protection, the autoclave was heated from room temperature to 180°C, corresponding to an intensity factor of 2.40 and a pressure of 1.19MPa. After rising to the predetermined maximum temperature (180°C), immediately pass condensed water to quickly lower the reactor to room temperature.

[0034] (2) The product obtained in step (1) is subjected to solid-liquid separation to obtain a solid-phase product and a liquid-phase product: the solid product is washed with hot water, dried and stored, and the liquid-phase product is stored in a 4°C refrigerator for later use.

[0035] (3) The solid-phase product obtained in step (2) was hydrolyzed by cellulase for 96 hours, and the yield of cellulase hydrolysis measured by high-performance anion exchange chromatography (HPAEC...

Embodiment 2

[0038] (1) Fully mix the lignocellulosic raw material (shrub red willow) crushed to 40-60 mesh with water at a mass ratio of 1:10, let it stand for 4 hours, and then transfer the mixture to a high-pressure reactor. Under the protection of nitrogen, heat the autoclave from room temperature to 190°C, the corresponding intensity factor is 2.70, and the pressure is 1.34MPa. When it rises to the predetermined maximum temperature (190°C), immediately pass condensed water to quickly cool the autoclave to room temperature .

[0039] (2) The product obtained in step (1) is subjected to solid-liquid separation to obtain a solid-phase product and a liquid-phase product: the solid product is washed with hot water, dried and stored, and the liquid-phase product is stored in a 4°C refrigerator for later use.

[0040] (3) The solid-phase product obtained in step (2) was hydrolyzed by cellulase for 96 hours, and its cellulase hydrolysis rate was 47.3% based on glucose conversion determined by...

Embodiment 3

[0043] (1) Fully mix the lignocellulosic raw material (shrub red willow) crushed to 40-60 mesh with water at a mass ratio of 1:10, let it stand for 4 hours, then transfer the mixture to a high-pressure reactor, Under protection, the autoclave is heated from room temperature to 200°C, corresponding to an intensity factor of 2.98 and a pressure of 1.63MPa. After rising to the predetermined maximum temperature (200°C), immediately pass condensed water to quickly lower the reactor to room temperature.

[0044] (2) The product obtained in step (1) is subjected to solid-liquid separation to obtain a solid-phase product and a liquid-phase product: the solid product is washed with hot water, dried and stored, and the liquid-phase product is stored in a 4°C refrigerator for later use.

[0045] (3) The solid-phase product obtained in step (2) was hydrolyzed by cellulase for 96 hours, and the cellulase hydrolysis rate of glucose measured by HPAEC-PAD was 65.8%. And the specific surface ...

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Abstract

The invention discloses a preprocessing method for a lignocellulose raw material, which comprises the following steps: (1) fully mixing the crashed lignocellulose raw material with water, and then standing for 2-4 hours, and transferring a mixture into a high-pressure reactor; heating the high-pressure reactor from room temperature to 180-240 DEG C under the protection of inert gases, and then immediately and quickly cooling the reactor to the room temperature through condensate water, wherein the strength factor is 2.40-4.17 and the pressure is a saturated vapor pressure at 1.19-3.45MPa at corresponding temperature; and (2) performing solid-liquid separation on the product obtained in the step (1), thereby obtaining a solid-phase product and a liquid-phase product. The preprocessing method for the lignocellulose raw material has the advantages of low cost, no pollution to environment, low energy consumption, high hydrolysis rate of hemicellulose, high recovery rate, and the like.

Description

technical field [0001] The invention relates to the technical field of utilization of agricultural and forestry biomass resources, in particular to a lignocellulose raw material pretreatment method. Background technique [0002] Lignocellulose is the most abundant renewable resource on earth, starting from lignocellulose to prepare biomass energy and bio-based chemicals, and gradually establish a bio-refining economic model, combined with petroleum refining, to realize the integration of bio-refining and petroleum refining , is an effective countermeasure to promote the development of resources and energy in our country. Lignocellulosic raw materials are mainly composed of three major parts: cellulose (38–50%), hemicellulose (23–32%) and lignin (15–25%). Polymers have strong hydrogen bonds in and between molecules, and have a certain degree of crystallinity; hemicellulose is composed of xylose, mannose, glucose, galactose, etc. Branched and connected to the main chain, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/12C12P19/14
Inventor 肖领平史正军白媛媛孙润仓许凤
Owner BEIJING FORESTRY UNIVERSITY
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