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Method for pretreating lignocellulose by using betaine eutectic solvent

A low eutectic solvent, lignocellulose technology, applied in the use of microorganism/enzyme cellulose treatment, cellulose raw material pulping, fiber raw material processing and other directions, can solve the problems of high toxicity, biodegradability, sensitivity, etc. Environmentally friendly, strong operability, and the effect of reducing dosage

Active Publication Date: 2019-09-20
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common ionic liquids used for lignocellulose pretreatment are mostly traditional imidazole and pyrimidine ionic liquids, which are sensitive to moisture, have strong toxicity and poor biodegradability

Method used

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  • Method for pretreating lignocellulose by using betaine eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a) Preparation of 50 wt% [betaine][glycine] deep eutectic solvent: add betaine solution with a mass fraction of 46% to glycine aqueous solution drop by drop under stirring, the molar ratio of betaine and glycine is 1:5, React at 20°C for 12 h.

[0020] b) Pretreatment: Put the dried corncob powder and [betaine][glycine] deep eutectic solvent (moisture content: 50 wt%) in a 250 mL single-necked flask according to the solid-to-liquid ratio of 1:5 Mix and stir at 50°C for 6 h; after the solid-liquid mixture is cooled to room temperature, add 1 times the volume of deionized water equal to the volume of the pretreatment solvent, mix, centrifuge to separate the solid and liquid, and then wash the solid with 3 times the volume of deionized water Repeat until the supernatant is colorless, then dry the solid to absolute dryness to obtain the pretreated corn cob.

[0021] c) Enzymatic hydrolysis: carry out enzymatic hydrolysis in 50 mL of acetate buffer (50 mM, pH 5.5), with a s...

Embodiment 2

[0023] a) Preparation of 60 wt% [betaine][lysine] deep eutectic solvent: add 46% betaine solution dropwise to aqueous lysine solution under stirring, moles of betaine and lysine The ratio was 1:10, and the reaction was carried out at 30°C for 24 h.

[0024] b) Pretreatment: According to the solid-to-liquid ratio of 1:10, dry corncob powder and [betaine][lysine] deep eutectic solvent (moisture content 40 wt%) in a 250 mL single-port Mix in a flask and stir at 70°C for 10 h; after the solid-liquid mixture is cooled to room temperature, add 1 times the volume of deionized water as the pretreatment solvent, mix, centrifuge to separate the solid and liquid, and then wash with 3 times the volume of deionized water The solid was washed several times until the supernatant was colorless, and then the solid was dried to absolute dryness to obtain pretreated corncobs.

[0025] c) Enzymatic hydrolysis: carry out enzymatic hydrolysis in 50 mL of acetate buffer (50 mM, pH 5.5), with a subs...

Embodiment 3

[0027] a) Preparation of 70 wt% [betaine][arginine] deep eutectic solvent: 46% betaine solution was added dropwise to arginine aqueous solution under stirring, the moles of betaine and arginine The ratio was 1:15, and the reaction was carried out at 40°C for 48 h.

[0028] b) Pretreatment: The dried corn stalk powder and [betaine][arginine] deep eutectic solvent (moisture content: 30 wt%) were mixed in a 250 mL single port according to the solid-to-liquid ratio of 1:20. Mix in a flask and stir at 90°C for 12 h; after the solid-liquid mixture is cooled to room temperature, add 1 times the volume of deionized water as the pretreatment solvent, mix, centrifuge to separate the solid and liquid, and then wash with 3 times the volume of deionized water The solid was washed for several times until the supernatant was colorless, and then the solid was dried to absolute dryness to obtain pretreated corn stalks.

[0029] c) Enzymatic hydrolysis: carry out enzymatic hydrolysis in 50 mL ...

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Abstract

The invention belongs to the technical field of efficient conversion and utilization of biomass resources, and discloses a method for pretreating lignocellulose by using a betaine eutectic solvent. The method comprises the following specific steps: 1) synthesizing a eutectic solvent with betaine as a hydrogen bond receptor and natural amino acid as a hydrogen bond donor; 2) employing a mixed solution of a eutectic solvent and water as a pretreatment solvent, and uniformly mixing a lignocellulose raw material with the pretreatment solvent according to a mass ratio of lignocellulose to the pretreatment solvent of 1:5-1:30, stirring the mixture at 50-140 DEG C for 2-48 h, cooling the pretreated mixture to room temperature, and finally carrying out solid-liquid separation to obtain pretreated solid-phase cellulose residues. The method not only can effectively improve the enzymolysis efficiency of lignocellulose, but also has the advantages of being environmentally friendly, renewable, easy to operate, low in viscosity, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency transformation and utilization of biomass resources, and in particular relates to a method for pretreating lignocellulose with a betaine deep eutectic solvent. Background technique [0002] With the increasing depletion of traditional fossil energy, human beings are facing the crisis of energy shortage and resource scarcity. At the same time, waste gas and waste water generated during the use of fossil fuels have caused serious pollution to the ecological environment. Therefore, it is a general trend to seek green, natural and renewable clean energy to replace traditional fossil fuels. The production of biofuels and various platform compounds from lignocellulose can effectively replace the increasingly scarce petroleum resources and reduce greenhouse gas emissions and environmental pollution. Cellulose, hemicellulose and lignin are the main components of lignocellulose, and they form a de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/22D21C5/00D21H11/12
CPCD21C5/005D21C3/22D21H11/12
Inventor 周海峰梁缘田原宇乔英云
Owner SHANDONG UNIV OF SCI & TECH
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