Method for fractionation of lignocelluloses biomass components through two-phase fused salt system

A lignocellulosic and fractional separation technology, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve problems such as difficult solvent circulation, high reaction temperature, and high environmental pressure, so as to reduce energy consumption, simplify the process flow, and reduce cost effect

Active Publication Date: 2019-01-11
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

Although the organic solvent component separation method can effectively break the lignocellulose structure and realize partial or complete separation of the components, the existing technology often requires a higher reaction temperature (>150 ° C), solvent circulation is difficult, alcohol precipitation and Insufficient complex processes such as repeated acid-base adjustments are prone to high energy consumption and high environmental pressure problems in the actual application process

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  • Method for fractionation of lignocelluloses biomass components through two-phase fused salt system

Examples

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Effect test

Embodiment 1

[0030] Using 5g of Pennisetum with a particle size of 0.5mm (containing 32% cellulose, 22% hemicellulose, and 28% lignin) as raw material, according to the mass volume ratio of raw material and hydrated molten salt 1g: 5cm 3 The amount of ZnCl added 2 ·3H 2 O hydrate molten salt 25cm 3 , and add 25cm 3 Furfural forms a two-phase molten salt-organic solution fractionation system for lignocellulosic biomass components. After stirring and reacting at 80° C. for 2 h, the residue was filtered, and the hydrated molten salt phase in which hemicellulose and cellulose were dissolved and the organic solution phase in which lignin was dissolved were separated.

[0031] With acetone as the organic solvent for sugar analysis, add acetone of 0.05 times the volume of the hydrated molten salt phase in the hydrated molten salt phase that is dissolved with hemicellulose and cellulose, and filter the obtained filter residue after drying to obtain 0.33g of the cellulose component. The mass co...

Embodiment 2

[0034] Using 5g of Pennisetum with a particle size of 0.5mm (containing 32% cellulose, 22% hemicellulose, and 28% lignin) as raw material, according to the mass volume ratio of raw material and hydrated molten salt 1g: 10cm 3 The amount of LiBr·3H added 2 O hydrate molten salt 50cm 3 , and add 100cm 3 Ethylene glycol phenyl ether forms a two-phase molten salt-organic solution fractionation system for lignocellulosic biomass components. After stirring and reacting at 100° C. for 1 h, the residue was filtered, and the hydrated molten salt phase in which hemicellulose and cellulose were dissolved and the organic solution phase in which lignin was dissolved were separated.

[0035] Using ethanol as the organic solvent for sugar analysis, add ethanol with 0.5 times the volume of the hydrated molten salt phase in the hydrated molten salt phase dissolved with hemicellulose and cellulose, and obtain 2.28g of the cellulose component after the filter residue obtained by filtering is dri...

Embodiment 3

[0038] Using 5g of bagasse (containing 38% cellulose, 27% hemicellulose, and 18% lignin) with a particle size of 0.5mm as raw material, according to the mass volume ratio of raw material and hydrated molten salt 1g: 10cm 3 The amount of ZnCl added 2 2H 2 O hydrate molten salt 50cm 3 , and add 10cm 3 Ethylene glycol phenyl ether-toluene solution with a volume ratio of 1:1 forms a two-phase molten salt-organic solution fractionation system for lignocellulosic biomass components. After stirring and reacting at 120° C. for 0.1 h, the residue was filtered, and the hydrated molten salt phase in which hemicellulose and cellulose were dissolved and the organic solution phase in which lignin was dissolved were separated.

[0039] Using methanol as an organic solvent for sugar analysis, add methanol with a volume of 0.2 times the volume of the hydrated molten salt phase in the hydrated molten salt phase in which hemicellulose and cellulose are dissolved, filter, and dry the obtained ...

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Abstract

The invention discloses a method for fractionation of lignocelluloses biomass components through a two-phase fused salt system. A molten salt hydrate-organic solution two-phase system is utilized to finish degradation and peeling of raw material hemicelluloses, swelling dissolution of cellulose and dissolution of lignin under a mild environment so as to break a compact structure of lignocelluloses, so that separation and extraction of all the components in the lignocelluloses biomass can be realized. The method is simple and practicable, is capable of separating the components of the lignocelluloses biomass under a lower temperature and is capable of effectively reducing energy consumption. The cellulose acquired according to the invention is locally decomposed poly-cellulose, has an amorphous structure and is easy for subsequent transformation and utilization.

Description

Technical field: [0001] The invention relates to the technical field of biomass energy conversion and utilization, in particular to a method for fractionating lignocellulosic biomass components in a two-phase molten salt system. Background technique: [0002] Lignocellulosic biomass is the most abundant renewable resource on earth, mainly composed of cellulose, hemicellulose and lignin. Biorefinery technology based on lignocellulosic biomass to produce fuels, materials or chemicals has received increasing attention. However, the components in lignocellulose are connected to each other to form a dense and complex three-dimensional structure. The efficiency of direct conversion and utilization of each component is very low, and it is often necessary to separate the components by component fractionation (fractionation) to facilitate Subsequent conversion and utilization of lignocellulosic components. [0003] At present, there are inorganic solvent systems and organic solvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14C08H7/00D21C5/00
CPCC08B37/0003C08H6/00D21C5/00
Inventor 谭雪松王闻庄新姝王琼余强亓伟王忠铭
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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