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Method for producing aromatic aldehyde by degrading lignin separated and coupled from cellulose component

A lignin and cellulose technology, applied in chemical instruments and methods, preparation of organic compounds, carbon-based compounds, etc., can solve problems such as uneven molecular weight, large steric hindrance, and low lignin reactivity

Inactive Publication Date: 2012-07-25
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest technical bottleneck for using lignin as a natural polymer graft is that lignin is a natural polymer substance with a spatial network structure, which has large steric hindrance and uneven molecular weight. Low content, low reactivity of lignin, except for the grafting of small molecule sulfonic acid groups, few other grafted products are industrialized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Corn cobs were added with dilute sulfuric acid solution at a solid-to-liquid ratio of 1:7 (weight to volume ratio, g:ml, the same below), with a sulfuric acid concentration of 1.0%, and cooked at 115°C for 150 minutes. After the reaction, centrifuge to separate the solid from the liquid. The liquid is used to produce sugar alcohol products. After the solid is washed with hot water, the acid hydrolysis residue is obtained, in which the cellulose content is 62.45%, the hemicellulose content: 4.17%, and the lignin content: 22.83%, ash content: 2.29% (the contents are all calculated on a dry basis, the same below), and other components are 8.26%.

[0022] The acid hydrolysis residue is further subjected to the separation of cellulose components. The reaction was carried out in a stainless steel reactor. The reaction conditions of lignin wet oxidation are: 140°C, total pressure 2.0MPa, oxygen partial pressure about 0.5MPa, in the reaction solution, the concentration of NaOH...

Embodiment 2

[0025] Add dilute sulfuric acid solution to corn stalks at a solid-to-liquid ratio of 1:9, with a sulfuric acid concentration of 0.8%, and cook for 100 min at 125°C. After the reaction, centrifuge to separate the solid from the liquid. The liquid is used to produce sugar alcohol products. After the solid is washed with hot water, the acid hydrolysis residue is obtained, in which the cellulose content is 65.42%, the hemicellulose content: 8.14%, and the lignin content: 20.64%, ash content: 4.62%, other components 1.18%.

[0026] The acid hydrolysis residue is further subjected to the separation of cellulose components. The reaction was carried out in a stainless steel reactor. The reaction conditions of lignin wet oxidation are: 160°C, total pressure 2.0MPa, oxygen partial pressure about 0.8MPa, in the reaction solution, the concentration of NaOH is 1.0mol / L, and the initial concentration of lignin is 100g / L (according to dry basis lignin meter), catalyst LaFeO 3 The dosage ...

Embodiment 3

[0029] Add dilute sulfuric acid solution to the bagasse at a solid-to-liquid ratio of 1:10, with a sulfuric acid concentration of 2.0%, and cook for 180 min at 105°C. After the reaction, centrifuge to separate the solid from the liquid. The liquid is used to produce sugar alcohol products. After the solid is washed with hot water, an acid hydrolysis residue is obtained, in which the cellulose content is 58.96%, the hemicellulose content: 6.47%, and the lignin content: 23.12%, ash content: 2.28%, other components 9.17%.

[0030] The acid hydrolysis residue is further subjected to the separation of cellulose components. The reaction was carried out in a stainless steel reactor. The reaction conditions of lignin wet oxidation are: 180°C, total pressure 2.0MPa, oxygen partial pressure about 1.0MPa, in the reaction solution, the concentration of NaOH is 1.5mol / L, and the initial concentration of lignin is 200g / L (according to dry basis lignin meter), catalyst LaFeO 3 The dosage ...

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Abstract

The invention provides a method for producing aromatic aldehyde by degrading lignin separated and coupled from a cellulose component. The method comprises the following steps: 1) performing pretreatment on a lignocellulose raw material through a diluted acid method to remove more than 80% of hemicellulose and obtain acid hydrolysis residue; 2) based on a perovskite type composite oxide as a catalyst and the acid hydrolysis residue obtained in the step 1) as the raw material, performing lignin wet-process oxidation reaction under alkaline conditions to degrade the lignin and further produce an aromatic aldehyde type compound, and performing solid-liquid separation after reaction to finally obtain the cellulose with the purity of not less than 80%. In the method provided by the invention, after the pretreatment is performed on the lignocellulose raw material through the diluted acid method, the obtained liquid glucose can be used for preparing xylose, xylitol, arabinose and other sugar alcohol products; and the lignin wet-process oxidation reaction is further performed on the acid hydrolysis residue under the alkaline conditions to obtain the high-purity cellulose and the aromatic aldehyde type compound so as to realize the all-component utilization of the lignocellulose raw material and have economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of biomass chemical industry, and in particular relates to a method for producing aromatic aldehydes by separating cellulose components and coupling lignin degradation. Background technique [0002] The pretreatment methods of lignocellulosic raw materials mainly include physical methods, chemical methods, physicochemical methods, biological methods, etc. The choice of pretreatment method is mainly considered from the aspects of improving efficiency, reducing cost, shortening processing time and simplifying the process. The ideal pretreatment process should be able to meet the requirements of high separation degree of cellulose, hemicellulose and lignin, and the preparation of corresponding other chemicals from each component to realize the full utilization of biomass. The utilization technology of hemicellulose and cellulose components in lignocellulosic raw material components has been relatively mature, ...

Claims

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Application Information

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IPC IPC(8): C07C47/58C07C47/575C07C45/00D21C3/02
Inventor 李荣杰
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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