Method for pretreating wood fiber raw material by adopting molten salt hydrate system

A technology for lignocellulosic raw materials and lignocellulose, which is applied in the field of biomass refining, can solve the problems of increased cost and high airtightness requirements, and achieves the effects of improving accessibility, reducing operating costs, and efficient saccharification.

Active Publication Date: 2020-11-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this method is: liquid ammonia is highly volatile, so it requires high airtightness of the equipment; at the same time, because the reaction temperature is as high as 140 degrees, further higher requirements are put forward for the high temperature and high pressure resistance of the reactor. , thus increasing the cost of equipment and production process

Method used

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  • Method for pretreating wood fiber raw material by adopting molten salt hydrate system
  • Method for pretreating wood fiber raw material by adopting molten salt hydrate system
  • Method for pretreating wood fiber raw material by adopting molten salt hydrate system

Examples

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Embodiment 1

[0030] Accurately prepare 5g with pure water containing 54% (w / w) ZnCl 2 molten salt hydrate system. Accurately weigh 1g microcrystalline cellulose powder (particle size 0.1cm), add to ZnCl 2 In the molten salt hydrate system, the solid-to-liquid ratio was 1:5, at 20°C, the stirring was continued at 300 rpm for 15 min, and then 5 g of pure water was added to terminate the reaction. Filtration for solid-liquid separation, the separated solid was washed with 25g of pure water and then subjected to enzymatic hydrolysis experiments to investigate the enzymatic hydrolysis and saccharification effect of microcrystalline cellulose after molten salt pretreatment; the filtered liquid was separated by chromatography to remove impurities, and then evaporated Concentrate to get recovered ZnCl 2 molten salt hydrate.

[0031] In this example, the crystalline structure of microcrystalline cellulose after molten salt pretreatment is obviously different from the raw material of microcrystal...

Embodiment 2

[0034] 8 g of a molten salt hydrate system containing 56% (w / w) LiCl was accurately prepared with pure water. Accurately weigh 1g of microcrystalline cellulose powder (particle size 0.1cm), add it to the LiCl molten salt hydrate system, the solid-to-liquid ratio is 1:8, keep stirring at 30°C for 30min at 400rpm, then add 16g pure Water terminates the reaction. Filtration for solid-liquid separation, the separated solid was washed with 48g of pure water and then subjected to enzymatic hydrolysis experiments to investigate the enzymatic hydrolysis and saccharification effect of microcrystalline cellulose after molten salt pretreatment; the filtered liquid was separated by chromatography to remove impurities, and then evaporated Concentration afforded recovered LiCl molten salt hydrate.

[0035] In this example, the crystalline structure of the microcrystalline cellulose after the molten salt pretreatment is obviously different from that of the raw material of the microcrystalli...

Embodiment 3

[0038] Precisely prepare 100 g of molten salt hydrate system containing 25% (w / w) LiBr with pure water. Accurately weigh 1g of microcrystalline cellulose powder (particle size 0.1cm), add it to the LiBr molten salt hydrate system, the solid-to-liquid ratio is 1:100, keep stirring at 500rpm at 25°C for 70 hours, then add 600g Pure water terminated the reaction. Filtration for solid-liquid separation, the separated solid was washed with 700g of pure water and then subjected to enzymatic hydrolysis experiments to investigate the enzymatic hydrolysis and saccharification effect of microcrystalline cellulose after molten salt pretreatment; the filtered liquid was separated by chromatography to remove impurities, and then evaporated Concentration afforded recovered LiBr molten salt hydrate.

[0039] In this example, the crystalline structure of the microcrystalline cellulose after the molten salt pretreatment is obviously different from that of the raw material of the microcrystall...

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Abstract

The invention provides a method for pretreating a wood fiber raw material by adopting a molten salt hydrate system. The method comprises the following steps of crushing the wood fiber raw material toa proper particle size, and adding the crushed wood fiber raw material into the molten salt hydrate system; stirring and reacting at the temperature of 20-100 DEG C for 0.1-72 hours, and then adding aproper amount of water to terminate the reaction; and after the reaction is finished, performing solid-liquid separation, and cleaning and desalting the separated wood fiber solid with water to obtain the wood fiber solid capable of being used for enzyme hydrolysis saccharification treatment. The method disclosed by the invention is low in cost, simple to operate and high in matching property with a saccharification stage, the molten salt can be recycled, and the whole process is green and sustainable, so that the method has important significance for application of the wood fiber raw materials. Besides, efficient pretreatment of the wood fiber raw material is achieved under the condition that cellulose does not dissolve, operation convenience is provided for subsequent solid-liquid separation, the method has very important significance in practical application, and the complexity and the operation cost of separation operation are greatly reduced.

Description

technical field [0001] The invention relates to the field of biomass refining, in particular to a new method for improving enzymatic hydrolysis and saccharification by pretreating lignocellulosic raw materials with a molten salt hydrate system. Background technique [0002] Lignocellulosic biomass is the most abundant renewable biomass resource on earth, and its conversion into energy, materials or chemicals has great application prospects. The main components of the cell wall of lignocellulosic raw materials (mainly referring to most green plants) are cellulose, hemicellulose and lignin, wherein cellulose and hemicellulose are the sources of six-carbon sugar and five-carbon sugar respectively, and lignin It is a macromolecule with a three-dimensional network structure formed by phenylpropane structural units through carbon-carbon bonds and ether bonds. It acts as a major physical hindrance to the degradation of cellulose and hemicellulose. On the other hand, there are amor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02
CPCC12P19/14C12P19/02C12P2201/00
Inventor 李滨黄仲雷于光刘超吴美燕崔球
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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