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Method for extracting cellulose from straw stalk by using imidazole ion liquid

A technology of rice straw and ionic liquid, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve the problem of serious cellulose degradation such as dissolution temperature, achieve far-reaching social significance and economic value, simple equipment and mild conditions

Inactive Publication Date: 2013-07-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in addition to imidazole-based ionic liquids, a few pyridine-based ionic liquids also have certain solubility properties for cellulose, but pyridine-based ionic liquids are severely degraded to cellulose and have harsh conditions such as high dissolution temperatures, which make current research less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for extracting cellulose from rice straw with imidazole ionic liquid, the steps are as follows:

[0024] 1) Crushing rice straw into rice straw powder over 100 mesh;

[0025] 2) Mix rice straw powder with ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl) at a mass ratio of 1:20 to obtain a mixture;

[0026] 3) Put the above mixture in an ultrasonic oscillator, use the ultrasonic power of 110W, and react at 60°C for 2h to obtain the reactant;

[0027] 4) Centrifuge the above reactant at 12000r / min for 10min, then separate the solid from the liquid, and take the supernatant;

[0028] 5) Add absolute ethanol to the supernatant obtained from the above separation, and the volume ratio of supernatant to absolute ethanol is 1:5 to obtain a mixed solution containing precipitates, and dry the obtained precipitates after suction filtration Preservation is the target product cellulose, and the filtrate after suction filtration is recovered;

[0029] 6) The rec...

Embodiment 2

[0035] A method for extracting cellulose from rice straw with imidazole ionic liquid, the steps are as follows:

[0036] 1) Crushing rice straw into rice straw powder over 100 mesh;

[0037] 2) Mix rice straw powder with ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl) at a mass ratio of 1:30 to obtain a mixture;

[0038] 3) Put the above mixture in an ultrasonic oscillator, use ultrasonic power of 100W, and react at 60°C for 2h to obtain the reactant;

[0039] 4) Centrifuge the above reactant at 12000r / min for 10min, then separate the solid from the liquid, and take the supernatant;

[0040] 5) Add absolute ethanol to the supernatant obtained from the above separation, and the volume ratio of supernatant to absolute ethanol is 1:5 to obtain a mixed solution containing precipitates, and dry the obtained precipitates after suction filtration Preservation is the target product cellulose, and the filtrate after suction filtration is recovered;

[0041] 6) The recover...

Embodiment 3

[0047] A method for extracting cellulose from rice straw with imidazole ionic liquid, the steps are as follows:

[0048] 1) Crushing rice straw into rice straw powder over 100 mesh;

[0049] 2) Mix rice straw powder with ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl) at a mass ratio of 1:40 to obtain a mixture;

[0050] 3) Put the above mixture in an ultrasonic oscillator, use an ultrasonic power of 80W, and react at 80°C for 1 hour to obtain a reactant;

[0051] 4) Centrifuge the above reactant at a speed of 12000r / min for 10min, then separate the solid from the liquid, and take the supernatant;

[0052]5) Add absolute ethanol to the supernatant obtained from the above separation, and the volume ratio of supernatant to absolute ethanol is 1:5 to obtain a mixed solution containing precipitates, and dry the obtained precipitates after suction filtration Preservation is the target product cellulose, and the filtrate after suction filtration is recovered;

[0053] ...

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PUM

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Abstract

The invention discloses a method for extracting cellulose from straw stalk by using imidazole ion liquid. Firstly, the straw stalk is crushed into 100-mesh powder, and then an ion liquid 1-allyl-3-methylimidazole chloride (AMIMCI) is used for extracting the cellulose in an ultrasonic environment, wherein the ion liquid 1-allyl-3-methylimidazole chloride (AMIMCI) is formed by synthesizing N-methylimidazole and allyl chloride. The method disclosed by the invention has the following advantages: by adopting ultrasonic oscillation to assist the ion liquid to dissolve the straw stalk powder, the method contributes to removal of lignin, can be used for effectively releasing connection of ester bonds between the lignin and a carbohydrate, effectively eliminating the coating effect of the lignin to the cellulose and hemicellulose, enhancing solution of the cellulose in the ion liquid, realizing efficient treatment of the straw stalk, improving the utilization efficiency of biomass resources and solving the problem that the straw stalk is hard to degrade and recycle, and has far-reaching social meaning and economical value.

Description

technical field [0001] The invention relates to biomass treatment technology, in particular to a method for extracting cellulose from rice straw by using imidazole ionic liquid. Background technique [0002] With the gradual depletion of disposable fossil fuel resources and the increasing tension of energy and resources, how to efficiently and comprehensively utilize and digest renewable energy—biomass energy has become a topic of widespread concern around the world. Cellulose is the most widely distributed and abundant biomass polymer in nature. Its structure is glucan formed by the connection of glucose molecules through β-1,4-glucosidic bonds. It usually contains thousands of glucose units and is the main component of plant cell walls. Every year, plants can produce 100 billion tons of cellulose through photosynthesis. At the same time, due to many advantages such as non-polluting, biocompatibility, easy degradability, and wide sources, it is regarded as an inexhaustible...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 刘乐鞠美庭李维尊江洋候其东刘益良
Owner NANKAI UNIV
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