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Method used for fractional separation of cellulose with different polymerization degrees using ionic liquid-carbon dioxide system

A technology of ionic liquid and carbon dioxide, which is applied in the production of bulk chemicals, can solve the problems of changing the solvation properties of solvents and affecting the effect of solvent resistance, and achieves the effect of simple method and simple process

Inactive Publication Date: 2015-05-27
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it can greatly swell conventional liquids, and at the same time change the solvation properties of the solvent itself, and many substances are insoluble in carbon dioxide, so to a certain extent, compressed carbon dioxide can exist as an anti-solvent at room temperature. The temperature and pressure can change the properties of the anti-solvent, thus affecting the effect of anti-solvent

Method used

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  • Method used for fractional separation of cellulose with different polymerization degrees using ionic liquid-carbon dioxide system
  • Method used for fractional separation of cellulose with different polymerization degrees using ionic liquid-carbon dioxide system

Examples

Experimental program
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Effect test

Embodiment 1

[0036]At 120°C, the microcrystalline cellulose was dissolved in the ionic liquid [Bmim]OAc, the mass ratio of the microcrystalline cellulose to the ionic liquid [Bmim]OAc was 10:100, and the ionic liquid solution of the microcrystalline cellulose was obtained, and an appropriate amount of This solution is put into a high-pressure reactor, and the device is placed in a constant temperature water tank. At 25°C, a pressure of 7 MPa is introduced to compress carbon dioxide to a system pressure of 6.60 MPa. After standing for 3 hours, the pressure is slowly reduced to 0.004 MPa, and the resulting At the same time, the ionic liquid [Bmim]OAc can also be recovered; the collected gas is passed into clarified lime water, so that the solution becomes turbid first and then becomes clear. It can be seen that its main component is carbon dioxide, and the anti-solvent carbon dioxide is completed. collect.

[0037] Combining Magic Angle Rotation Technique with Fourier Transform Infrared Spec...

Embodiment 2-8

[0040] According to the method of Example 1, only the pressure of 7MPa compressed carbon dioxide to the pressure of the system is passed through at 25°C. The strength is 6.60MPa" and replaced by:

[0041] "At 25°C, a pressure of 9 MPa is introduced to compress carbon dioxide to a system pressure of 8.00 MPa",

[0042] "At 25°C, a pressure of 11MPa is introduced to compress carbon dioxide to a system pressure of 10.00MPa",

[0043] "At 25°C, a pressure of 13MPa is introduced to compress carbon dioxide to a system pressure of 12.00MPa",

[0044] "At 25°C, a pressure of 15MPa is introduced to compress carbon dioxide to a system pressure of 14.00MPa",

[0045] "At 25°C, a pressure of 17MPa is introduced to compress carbon dioxide to a system pressure of 16.00MPa",

[0046] "At 25°C, a pressure of 19MPa is introduced to compress carbon dioxide to a system pressure of 18.00MPa",

[0047] "At 25°C, a pressure of 21MPa is introduced to compress carbon dioxide to a system pressure...

Embodiment 9-12

[0052] According to the method of Example 1, only "at 25°C, pressurize carbon dioxide at a pressure of 7 MPa to compress the carbon dioxide to a system pressure of 6.60 MPa, and let it stand for 3 hours" are replaced by

[0053] "At 25°C, inject pressure of 7MPa to compress carbon dioxide to a system pressure of 6.60MPa, and let it stand for 1h",

[0054] "At 25°C, inject pressure of 7MPa to compress carbon dioxide to a system pressure of 6.60MPa, and let it stand for 2h",

[0055] "At 25°C, inject pressure of 7MPa to compress carbon dioxide to a system pressure of 6.60MPa, and let it stand for 5h",

[0056] "At 25°C, a pressure of 7 MPa is introduced to compress carbon dioxide to a system pressure of 6.60 MPa, and it is left to stand for 10 hours",

[0057] The yields of the obtained regenerated cellulose were 17.1%, 34.5%, 59.0%, and 59.2%, respectively.

[0058] The viscosity-average molecular weight of regenerated cellulose was obtained by Ubbelohde viscometer method, an...

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Abstract

The invention discloses a method used for processing cellulose using an ionic liquid-carbon dioxide mixed system so as to realize fractional separation of cellulose with different polymerization degrees and recovery of the ionic liquid. The method comprises following steps: carbon dioxide is delivered into a clarified homogeneous ionic liquid solution of cellulose, so that precipitation of dissolved cellulose from the ionic liquid solution is realized because of dissolving resistance of compressed carbon dioxide; regenerated cellulose with different polymerization degrees and viscosity-average molecular weight is obtained via adjustment on reaction temperature, reaction time, and reaction pressure; the ionic liquid is recycled for continuous dissolving of cellulose after the above steps, and at the same time recycling of carbon dioxide can be realized via gathering and releasing in operation processes. The method is simple and green, is high in efficiency, and is capable of realizing grading processing of products with different polymerization degrees, increasing efficiency of bio-refinery process, and satisfying industrial processing requirements.

Description

technical field [0001] The invention relates to the technical fields of biomass material utilization and biomass chemical industry, in particular to a method for treating cellulose with a mixed system of ionic liquid and carbon dioxide and fractionating cellulose with different degrees of polymerization. Background technique [0002] Modern chemical industry is an important foundation for social civilization and economic development. Most of the current chemical industry relies on fossil resources such as coal, oil and natural gas. While the massive consumption of fossil resources in the past century has created unprecedented material civilization for human society, it has also brought about problems such as the depletion of oil resources and environmental pollution caused by industrial emissions. In order to maintain the sustainable development of the chemical industry, the pressure from both resources and the environment forces people to look for new resources to replace t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/08
CPCY02P20/54
Inventor 牟天成孙晓甫迟岩陵
Owner RENMIN UNIVERSITY OF CHINA
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