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Method for separating wood fiber components

A technology of lignocellulosic and lignocellulosic raw materials, which is applied in the fields of fiber raw material treatment, washing/replacing pulp treatment liquid, textiles and papermaking, etc. It can solve the problems of difficult large-scale industrial application, reduce the potential of high-value utilization of lignin, and the formation of lignin Difficult and stable problems, to achieve the effect of efficient utilization and solve the balance problem of degradation yield and reactivity

Active Publication Date: 2021-08-24
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Some separation methods of current lignocellulosic biomass components, 1. The typical delignification process mostly occurs under harsh treatment conditions (150°C), using sodium sulfate, sulfite or sodium hydroxide to make lignin occur Irreversible degradation of highly condensed structures, therefore, these lignin components are difficult to stabilize; 2. Ionic liquids separate wood fibers, ionic liquids are usually expensive, and some ionic liquids such as imidazole, pyridine, etc. are toxic, making it difficult for large-scale industrial applications 3. Zhu Junyong (Chen L, Dou J, Ma Q, et al. Rapid and near-complete dissolution of wood lignnat 70%), in addition, there is obvious self-condensation phenomenon in the reaction process of lignin, which reduces the potential of high-value utilization of lignin; 4. Zhai Qiaolong (ZhaiQ, Long F, Hse C, et al.Facile Fractionation of Bamboo Wood Toward BiomassValorization by p-TsOH-Based Methanolysis Pretreatment[J].ACS SUSTAINABLECHEMISTRY&ENGINEERING,2019,7(23):19213-19224.) Using methanol instead of water as solvent and p-toluenesulfonic acid as acid catalyst to study lignocellulosic biomass Fractional distillation, the separation of lignocellulosic fibers is completed under relatively mild conditions (<120°C). The lignin obtained by this method has a high content of β-O-4 structure and a high reaction temperature

Method used

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  • Method for separating wood fiber components
  • Method for separating wood fiber components
  • Method for separating wood fiber components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for the separation of lignocellulosic components, the flow chart is as figure 1 shown, including the following steps:

[0027] (1) Weigh 3.0g of poplar sawdust, dissolve 18.0g of 4-hydroxybenzenesulfonic acid hydrate (37.5wt.%) in 30.0g of methanol, add it into the reaction kettle, start stirring, and heat up to 60°C, temperature controlled reaction for 2h;

[0028] (2) After the reaction was completed, it was rapidly cooled to room temperature, filtered, and the residue was washed with water and dried at 105° C. to obtain 1.7 g of solid residue with a conversion rate of 42.8%. The contents of cellulose, hemicellulose and lignin in the residue were 82.7%, 4.8% and 9.3%, respectively.

[0029] image 3 The 2D-HSQC delineated the two main cross-signaling regions of lignin, namely the side chain (δC / δH 40-90 / 2.5-5.5ppm) and aromatic (δC / δH 100-140 / 5.5-8.5ppm) regions; Signals in the compound region (δC / δH90-105 / 4.0-5.5ppm) were not detected in all lignin sampl...

Embodiment 2

[0031] A method for separating lignocellulosic components, comprising the steps of:

[0032] (1) Weigh 3.0g of poplar sawdust, dissolve 18.0g of 4-hydroxybenzenesulfonic acid hydrate (37.5wt.%) in 30.0g of methanol, add it into the reaction kettle, start stirring, and heat up to 70°C, temperature controlled reaction for 2h;

[0033] (2) After the reaction was completed, it was rapidly cooled to room temperature, filtered, and the residue was washed with water and dried at 105° C. to obtain 1.6 g of solid residue with a conversion rate of 47.8%. The contents of cellulose, hemicellulose and lignin in the residue were 88.9%, 2.9% and 5.7%, respectively.

Embodiment 3

[0035] A method for separating lignocellulosic components, comprising the steps of:

[0036] (1) Weigh 3.0g of poplar sawdust, dissolve 18.0g of 4-hydroxybenzenesulfonic acid hydrate (37.5wt.%) in 30.0g of methanol, add it to the reaction kettle, start stirring, and heat up to 80°C, temperature controlled reaction for 2h;

[0037] (2) After the reaction was completed, it was rapidly cooled to room temperature, filtered, and the residue was washed with water and dried at 105° C. to obtain 1.4 g of solid residue with a conversion rate of 53.5%. The contents of cellulose, hemicellulose and lignin in the residue were 92.5%, 2.5% and 3.4%, respectively.

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Abstract

The invention discloses a method for separating wood fiber components, and belongs to the technical field of wood fiber biomass. A 4-hydroxybenzenesulfonic acid hydrate is used as a solubilizing solvent for alcoholysis of a wood fiber raw material, and high-activity lignin and high-purity cellulose are obtained at the same time. The method is based on 4-hydroxybenzenesulfonic acid alcoholysis poplar sawdust biomass, lignin and cellulose are separated at a low temperature (less than 80 DEG C), high-activity lignin and high-purity cellulose are obtained at the same time, and the balance problem of lignin degradation yield and reaction activity is solved.

Description

technical field [0001] The invention belongs to the technical field of lignocellulosic biomass, and in particular relates to a method for separating lignocellulosic components. Background technique [0002] The structural complexity of biomass and the marked differences in the physical and chemical properties of cellulose, hemicellulose, and lignin pose obstacles to the degradation process of biomass conversion. At present, many studies have realized the conversion of all components of lignocellulosic fibers through thermochemical conversion technology, and obtained complex mixtures containing various aldehydes, acids, esters, phenolic derivatives and cyclic oxygenates, which are very important for product separation and further refining. The process posed enormous difficulties. Studies have shown that the most potential utilization method of lignocellulosic biomass is to completely separate the components of cellulose, hemicellulose and lignin, and then carry out further c...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C9/02C08B37/14C08H7/00
CPCD21C5/00D21C9/02C08B37/0003C08H6/00Y02E50/30
Inventor 徐俊明韩双美翟巧龙龙锋
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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