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Process method for pretreating cellulose by using ionic liquid to completely convert cellulose into water-soluble sugar

A technology of ionic liquids and water-soluble sugars, applied in chemical instruments and methods, organic chemistry, sugar derivatives, etc., to achieve high efficiency, thorough treatment, and environmental reusability

Active Publication Date: 2012-11-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there have been no reports on the conversion of cellulose into water-soluble substances by phosphate-based ionic liquids and the mechanism of their interaction with cellulose.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example illustrates the 150 o Under C, the selected ionic liquid is [BMIM]Cl, and the mass of cellulose is 10.0% of the mass of the ionic liquid, the process of pre-treating cellulose with ionic liquid to obtain water-soluble sugar

[0026] The cellulose was dried at 110°C for 24 hours in a forced air drying oven. Take 5.000g of ionic liquid and add it into a 100ml round bottom flask, place it in an oil bath at 150°C, and blow it with nitrogen for 60min during stirring. Add 0.500 g of cellulose and continue stirring to dissolve the cellulose into the ionic liquid to form a transparent homogeneous solution. After the conversion, stop heating, and quickly add 30ml of ethanol to the flask to precipitate unconverted cellulose and water-soluble sugar in solid form, filter and wash 3 times to obtain the ethanol solution of the ionic liquid. Finally, the precipitated solid was dissolved with deionized water and filtered to obtain water-soluble sugar; the ethanol solutio...

Embodiment 2

[0029] This example illustrates the 150 o Under C, the ionic liquid is selected as [Mmim][DMP], and the mass of the cellulose is 10.0% of the mass of the ionic liquid. The process of pre-treating the cellulose with the ionic liquid to obtain water-soluble sugar

[0030] The cellulose was dried at 110°C for 24 hours in a forced air drying oven. Take 5.000g of ionic liquid and add it into a 100ml round bottom flask, place it in an oil bath at 150°C, and blow it with nitrogen for 60min during stirring. Add 0.500 g of cellulose and continue stirring to dissolve the cellulose into the ionic liquid to form a transparent homogeneous solution. After the conversion, stop heating, and quickly add 30ml of ethanol to the flask to precipitate unconverted cellulose and water-soluble sugar in solid form, filter and wash 3 times to obtain the ethanol solution of the ionic liquid. Finally, the precipitated solid was dissolved with deionized water and filtered to obtain water-soluble sugar; t...

Embodiment 3

[0033] This example illustrates at 140 o Under C, the ionic liquid is selected as [Mmim][DMP], and the mass of cellulose is 5.0% of the mass of the ionic liquid, the process of pre-treating cellulose with ionic liquid to obtain water-soluble sugar

[0034]The cellulose was dried for 24 h in a forced air oven at 90 °C. Take 5.000g of ionic liquid and add it into a 100ml round bottom flask, place it in an oil bath at 140°C, and blow nitrogen for 90min during stirring. Add 0.250 g of cellulose and continue stirring to dissolve the cellulose into the ionic liquid to form a transparent homogeneous solution. After the conversion, 30ml of ethanol was quickly added to the flask to precipitate unconverted cellulose and water-soluble sugar in solid form, and filtered to obtain an ethanol solution of the ionic liquid. Finally, the precipitated solid was dissolved with deionized water and filtered to obtain water-soluble sugar; the ethanol solution of the ionic liquid was rotary-evapora...

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Abstract

The invention discloses a process method for pretreating cellulose by using ionic liquid to completely convert the cellulose into water-soluble sugar. The method comprises the following steps of: synthesizing phosphate ionic liquid by using N-methylimidazole and phosphate through a one-step method, dissolving at the temperature of 140 to 160 DEG C, and converting the cellulose into the water-soluble sugar; and separating the water-soluble sugar obtained by the experiment from the ionic liquid by an ethanol anti-solvent method so as to fulfill the aim of recycling the ionic liquid. Compared with the pretreatment process of the traditional physical method and acid-alkali method, the method has the advantages that the process of pretreating the cellulose by using the ionic liquid is environment-friendly, low in energy consumption and high in efficiency, and the cellulose is thoroughly treated; and compared with the previously reported process of pretreating the cellulose by using halogen ionic liquid, the method has the advantages that the phosphate ionic liquid is low in raw material price, toxicity and viscosity and high in heat stability, and a synthesis method is simple.

Description

technical field [0001] The invention relates to a process for destroying the dense structure of cellulose by utilizing the ability of ionic liquid to form hydrogen bonds with cellulose, so as to completely convert it into water-soluble sugar. Background technique [0002] In recent years, the research on the conversion of cellulosic biomass into sugar and fuel chemicals has attracted extensive attention of researchers at home and abroad. However, due to the existence of a large number of hydrogen bonds between cellulose macromolecules and the formation of a dense network structure, cellulose is difficult to dissolve in water and other traditional organic solvents. This property of cellulose has seriously affected its wide application. [0003] Theoretically speaking, through an effective pretreatment process, the crystallinity of cellulose can be reduced, and the contact area of ​​cellulose with catalyst and solvent can be increased. The pretreatment methods currently used...

Claims

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Application Information

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IPC IPC(8): C07H3/00C07H1/00
CPCY02P20/54
Inventor 吴卫泽刘维娜
Owner BEIJING UNIV OF CHEM TECH
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