Method for separating three components of cellulose, hemicellulose and lignin in plant fiber raw materials

A technology of hemicellulose and plant fiber, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of serious pollution of water resources and atmospheric environment, and achieve excellent performance, efficient separation and resource utilization, and low production energy consumption Effect

Active Publication Date: 2018-10-16
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: Aiming at defects such as serious pollution of water resources and atmospheric environment produced by the traditional pulping and papermaking process, the purpose of the invention is to provide an environmentally friendly and efficient three-component separation method for plant fiber raw materials, which is an environmentally friendly , low energy consumption pulp and paper production process

Method used

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  • Method for separating three components of cellulose, hemicellulose and lignin in plant fiber raw materials

Examples

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Embodiment 1

[0023] A method for separating three components of cellulose, hemicellulose and lignin in a plant fiber raw material, the specific steps are as follows:

[0024] 1) Lactic acid / choline chloride deep eutectic solvent configuration

[0025] Mix lactic acid and choline chloride evenly, stir at 60°C for 1 hour, and configure a lactic acid / choline chloride deep eutectic solvent with a molar ratio of 9:1.

[0026] 2) Plant fiber raw materials are heated and cooked in a deep eutectic solvent

[0027] Long 2 ~ 4cm, wide 1 ~ 2cm poplar chips are placed in the air for 2 days, measure the moisture, take by weight 50g dry poplar chips and join in the pressurized reaction kettle, and add the 250g prepared by step 1) with a molar ratio of 9: 1 lactic acid / choline chloride deep eutectic solvent, so that the solid-liquid ratio of the plant fiber raw material and the deep eutectic solvent is 1:5, and then heat and cook. The conditions of the heating and cooking treatment are as follows: the ...

Embodiment 2

[0035] The separation of cellulose, hemicellulose and lignin three components in the plant fiber raw material is the same as in Example 1, wherein, in step 2), the plant fiber raw material sample is 2-4 cm long and 1-2 cm wide. Masson pine wood chips of ~4cm and 1~2cm in width, moso bamboo chips of 2~4cm in length and 1~2cm in width, poplar wood powder of 20 mesh to 80 mesh, masson pine wood powder of 20 mesh to 80 mesh, moso bamboo powder of 20 mesh to 80 mesh, Either straw with a length of 2 to 4 cm or wheat straw with a length of 2 to 4 cm can be used instead.

Embodiment 3

[0037] The separation of cellulose, hemicellulose and lignin three components in the plant fiber raw material, method is the same as embodiment 1, wherein, in step 2), the lactic acid / choline chloride deep eutectic solvent that molar ratio is 9:1 adopts The molar ratio is either 5:1, 7:1, 11:1 lactic acid / choline chloride.

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Abstract

The invention discloses a method for separating three components of cellulose, hemicellulose and lignin in plant fiber raw materials. The method comprises the following steps of heating, steaming andboiling the plant fiber raw materials by a lactic acid/choline chloride low-eutectic solvent in a pressurizing or normal-pressure way, selectively dissolving out the lignin and hemicellulose, and washing the remaining insoluble matters, so as to obtain the cellulose; adding water into a dissolution solution of the low-eutectic solvent containing lignin and hemicellulose, the lignin is separated out, washing and separating, so as to obtain the lignin; separating the remaining water solution of low-eutectic solvent containing the hemicellulose in a nanofiltration way, so as to obtain the hemicellulose; concentrating and dewatering the water solution of the low-eutectic solvent, so as to recycle. The method has the advantages that the components of the plant fiber raw materials can be fully separated, so as to obtain the cellulose with content of alpha-cellulose greater than 79.5% and polymerizing degree of 1,113, the lignin with purity greater than 89%, and the hemicellulose with yield rate greater than 45%; the production energy consumption is low, the property of the obtained slurry is excellent, and the industrialized application prospect is realized.

Description

technical field [0001] The invention belongs to the category of comprehensive utilization of biomass resources, relates to the technical field of separation of three components of cellulose, hemicellulose and lignin, and specifically relates to the separation of three components of cellulose, hemicellulose and lignin in plant fiber raw materials The method uses a new type of green deep eutectic solvent to realize the efficient separation of the components of the plant fiber raw material, which is a new green and environmentally friendly separation process of the three elements of the plant fiber raw material. Background technique [0002] In the pulp and paper industry, traditional cellulose separation methods, such as the sulfate method or caustic soda method, not only consume high energy for production, but also produce black liquor with extremely high pollution load during the cooking process, which has caused great pressure on the environment . And the commonly used kra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00C08B37/14C08H7/00
CPCC08B37/0003C08H6/00D21C5/00
Inventor 王志国陈宇杰俞娟范一民
Owner NANJING FORESTRY UNIV
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