Efficient method for separating lignocellulosic raw material

A technology for lignocellulosic raw materials and separation methods, which is applied in the processing of fibrous raw materials, textiles and papermaking, etc., can solve the problems of difficult separation and recovery of lignin and carbohydrates, product quality of catalyst residues, and difficulty in commercialization, and achieve economical realization. The effect of improving the recovery rate is good

Inactive Publication Date: 2016-04-20
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Abstract
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Problems solved by technology

However, high-boiling alcohols also have the problems of high solution viscosity, difficult separation and recovery of dissolved lignin and carbohydrates, and it is difficult to realize commercialization in the short term.
For example, Chinese patent CN103635628A discloses a method for treating lignocellulosic biomass in an acidic environment in the presence of a catalyst and an oxidant, but since the catalyst is used, it requires a subsequent step of removing the catalyst, otherwise the catalyst will Remains in the final product and affect product quality

Method used

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  • Efficient method for separating lignocellulosic raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Use a pulverizer to crush the air-dried coniferous wood chips into fine particles with a particle size of about 2mm, and mix them with 88% formic acid aqueous solution and 2wt% green oxygen (relative to the absolute dry raw material) at a liquid-solid ratio of 10:1. The mixture was heated at 140° C. for 30 min in an autoclave (Parr 4848, 300 mL). After reaching the specified reaction time, cool to room temperature, and filter to obtain the crude cellulose solid part and the formic acid solution part in which hemicellulose sugar and lignin are dissolved.

[0038] Distill the liquid part under reduced pressure to recover formic acid, add deionized water about 8 times the volume of the precipitate to the remaining precipitate after distillation, mix well and then centrifuge, the supernatant liquid is hemicellulose sugar, and the precipitate part is formic acid lignin. The content of cellulose, hemicellulose and lignin was then analyzed according to the method described in ...

Embodiment 2

[0042] Use a pulverizer to crush the air-dried coniferous wood chips into fine particles with a particle size of about 2 mm, and mix them with 88% formic acid aqueous solution and 10 wt% hydrogen peroxide (relative to the dry raw material) at a liquid-solid ratio of 10:1. Into an autoclave (Parr 4848, 300 mL), the mixture was heated at 140 °C for 30 min. After reaching the specified reaction time, cool to room temperature, and filter to obtain the crude cellulose solid part and the formic acid solution part in which hemicellulose sugar and lignin are dissolved.

[0043] Distill the liquid part under reduced pressure to recover formic acid, add deionized water about 8 times the volume of the precipitate to the remaining precipitate after distillation, mix well and then centrifuge, the supernatant liquid is hemicellulose sugar, and the precipitate part is formic acid lignin.

[0044] The obtained crude cellulose solid part is beaten with water until the solid concentration is 10...

Embodiment 3

[0049] The air-dried coniferous wood chips were crushed into fine particles with a particle size of about 2mm with a pulverizer, mixed with an aqueous formic acid solution with a concentration of 88% at a liquid-to-solid ratio of 10:1, and added to an autoclave (Parr4848, 300mL), and then added to the high-pressure reactor. Oxygen gas at a pressure of 0.6 MP was introduced into the reactor, and then the mixture was heated at 130° C. for 30 min. After reaching the specified reaction time, cool to room temperature, and filter to obtain the crude cellulose solid part and the formic acid solution part in which hemicellulose sugar and lignin are dissolved.

[0050] Distill the liquid part under reduced pressure to recover formic acid, add deionized water about 8 times the volume of the precipitate to the remaining precipitate after distillation, mix well and then centrifuge, the supernatant liquid is hemicellulose sugar, and the precipitate part is formic acid lignin.

[0051] The ...

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Abstract

The present invention relates to a method for separating a lignocellulosic raw material by an improved formic-acid-pretreated lignocellulosic biomass, according to the method, an oxidizing agent is added into a formic-acid solution to significantly improve the selectivity of pretreatment separation of cellulose, hemicellulose and lignin, and the recovery rate of the three components of the cellulose, hemicellulose and lignin can be increased.

Description

technical field [0001] The invention belongs to the field of bioenergy, and specifically relates to a method for separating lignocellulosic raw materials through improved formic acid pretreatment of lignocellulosic biomass, thereby efficiently obtaining high-purity and easy-to-use cellulose, lignin and hemifibers Methods. Background technique [0002] Traditional fossil energy sources (coal, oil, natural gas, etc.) are increasingly depleted, environmental problems caused by greenhouse gases are becoming more and more serious, and the demand for transportation fuels that are most dependent on fossil energy is increasing year by year, so renewable agricultural and forestry biomass fiber raw materials (such as wood, corn stalks, rice straw, wheat straw, bagasse, etc.) into liquid fuels or materials and chemicals that replace fossil resource sources are of great significance and have become a research hotspot in various countries. [0003] Lignocellulosic raw materials are the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 王海松于光牟新东李双洋
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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