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Method for selectively separating lignin and cellulose from lignocellulose biomasses

A lignocellulosic and biomass technology, which is applied in the direction of raw material separation, non-woody plant/crop pulp, pulping with organic solvents, etc., can solve the problems of undiscovered industrial application fields, increase the effective specific surface area, reduce Production cost, effect of promoting degradation

Inactive Publication Date: 2013-05-08
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The research on the utilization of lignin has been carried out for a century. Although there has been a small-scale utilization at present, compared with its existing quantity, no large-scale economically satisfactory industrial application field has been found. Considering resources and the environment, The technology of extracting lignin components and separating dissolved cellulose from biomass and other plants is still a field of special attention, because in order to achieve the goal of degrading lignin into large-scale commercial low-molecular chemicals, it is necessary to explore economic and environmental protection. , Feasible lignin separation pathway

Method used

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  • Method for selectively separating lignin and cellulose from lignocellulose biomasses
  • Method for selectively separating lignin and cellulose from lignocellulose biomasses
  • Method for selectively separating lignin and cellulose from lignocellulose biomasses

Examples

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Embodiment 1

[0025] A method for selectively separating lignin and cellulose from lignocellulosic biomass, comprising the following steps:

[0026] a. Pretreatment of lignocellulosic biomass: pulverize sesame straw, pass through a 180-mesh sieve, dry in an oven at 105°C for 60 minutes, and then expand to obtain sesame straw particles for subsequent use;

[0027] b. Dissolution of lignocellulose and degradation of biomass: Weigh 15g of ionic liquid 1-butyl-3-methylimidazolium chloride salt into a 50mL flask, heat and melt in an oil bath at 104°C, and stir the ions Liquid and add 2.5g of sesame straw granules to it, seal the flask, control the temperature at 90°C, keep stirring and heating for 2h to obtain a viscous substance;

[0028] Add 10% dilute hydrochloric acid dropwise to the viscous substance obtained above while stirring, adjust the pH value to 4.5, and continue heating and stirring for 5 hours to obtain a reaction slurry;

[0029] c. Extraction and separation: After cooling the r...

Embodiment 2

[0039] A method for selectively separating lignin and cellulose from lignocellulosic biomass, comprising the following steps:

[0040] a. Pretreatment of lignocellulosic biomass: crush corn stalks, pass through a 180-mesh sieve, dry in an oven at 80°C for 60 minutes, and then puff them to obtain corn stalk particles for later use;

[0041]b. Dissolution of lignocellulose and degradation of biomass: Weigh 15g of ionic liquid 1-butyl-3-methylimidazolium chloride salt in a 100mL flask, heat and melt in an oil bath at 95°C, and stir the ions Liquid and add 2.5g of corn stalk particles to it, seal the flask, control the temperature at 110°C, stir and heat continuously for 3h to obtain a viscous substance;

[0042] Add 5% dilute hydrochloric acid dropwise to the viscous substance obtained above while stirring, adjust the pH value to 4.8, continue heating and stirring for 7 hours, and obtain a reaction slurry;

[0043] c. Extraction and separation: After cooling the reaction slurry ...

Embodiment 3

[0046] A method for selectively separating lignin and cellulose from lignocellulosic biomass, comprising the following steps:

[0047] a. Pretreatment of lignocellulosic biomass: crush peanut shells, pass through a 180-mesh sieve, dry in an oven at 110°C for 90 minutes, and then expand to obtain peanut shell particles for subsequent use;

[0048] b. Dissolution of lignocellulose and degradation of biomass: Weigh 50g of ionic liquid 1-butyl-3-methylimidazolium chloride salt in a 500mL flask, heat and melt in an oil bath at 110°C, and stir the ions Add 20g of peanut shell particles to the liquid, seal the flask, control the temperature at 90°C, keep stirring and heating for 2.5h to obtain a viscous substance;

[0049] Add 8% dilute hydrochloric acid dropwise to the viscous substance obtained above while stirring, adjust the pH value to 4.5, and continue heating and stirring for 5 hours to obtain a reaction slurry;

[0050] d. Extraction and separation: after cooling the reactio...

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Abstract

The invention relates to a method for selectively separating lignin and cellulose from lignocellulose biomasses, belonging to the field of chemical engineering extraction. The method comprises the steps of: a. pretreatment of the lignocellulose biomasses; b. dissolution of lignocelluloses and degradation of biomasses; and c. extraction and separation. According to the method, the extraction rate of the lignin reaches above 90%, the recovery rate of ionic liquid, namely 1-butyl-3-methylimidazole chroline salt ([Bmim]C1) also reach above 80%, and the cyclic utilization of the ionic liquid can be realized so that production cost is reduced, the lignin and cellulose are simultaneously extracted from the lignocellulose biomasses through control of reaction conditions so that energy consumption is obviously reduced; and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the extraction and separation technology in the field of chemical industry, in particular to a method for selectively separating lignin and cellulose from lignocellulosic biomass. Background technique [0002] Lignin, cellulose and hemicellulose are the main components of plant skeleton lignocellulose. It is estimated that lignin produced by plants in the world reaches 150 billion tons every year. Lignin is a huge, renewable and biodegradable natural polymer compound. Due to its complex structure, uneven physical and chemical properties, difficulty in separation and extraction and easy Condensation, etc., have not yet been fully and effectively utilized. Lignin is the second most abundant renewable resource after cellulose in nature, with fast regeneration speed, and is the most abundant aromatic polymer in nature. [0003] The research on the utilization of lignin has been carried out for a century. Although there has been a...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21B1/36D21C3/20C08H7/00
Inventor 王键吉尹卫平任运来李欣王晓平黄闪闪田广富刘柱萍
Owner HENAN UNIV OF SCI & TECH
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