Solvent of cellulose

A cellulose and solvent technology, applied in the field of solvents, can solve problems such as toxicity, harsh operating conditions, and cellulose degradation

Inactive Publication Date: 2009-10-21
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these solvent systems have their own advantages, they have the following disadvantages: solvent instability, high cost, toxicity, difficult recovery and harsh operating conditions, etc.
Although amimCl and amimHCOO are liquid at room temperature, cellulose begins to dissolve in amimCl only when the temperature rises to 60°C (Biomacromolecules, 2004, 5, 266-268); meanwhile, amimHCOO has poor thermal stability, and Easily lead to cellulose degradation (Macromolecules 1991, 24, 6670-6679; Cellulose 1999, 6, 213-219)

Method used

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  • Solvent of cellulose

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Embodiment Construction

[0004] The present invention first screens out the ionic liquid 1-butyl-3-methylimidazolium acetate (bmimAc) which has a strong dissolving ability to cellulose, and then screens out the co-solvent dimethyl sulfoxide which can be miscible with (bmimAc) (DMSO), and then bmimAc and DMSO are dissolved in a certain proportion to form a composite solvent. After a large number of tests, the composite solvent made by bmimAc and DMSO with a mass ratio of 2:1-1:5 has excellent fiber-dissolving properties. The performance of cellulose has achieved the effect of dissolving cellulose in large doses at room temperature.

[0005] The present invention has following embodiment:

[0006] 1). A large dose of cellulose is dissolved at room temperature, which is obviously better than other solvents under the same conditions. For example: at 25°C, the solubility of microcrystalline cellulose in bmimAc / DMSO (1:1) can reach 15.0%; at 17°C, the solubility of microcrystalline cellulose in bmimAc / DMSO...

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Abstract

The invention discloses a solvent of cellulose, and in particular relates to a solvent. The invention aims to provide the solvent of the cellulose, which can dissolve the cellulose at room temperature. The technical proposal comprises that the solvent is a compound solvent of 1-butyl-3-methylimidazolium acetate ion liquid and a dimethyl sulphoxide cosolvent. The mass ratio of the 1-butyl-3-methylimidazolium acetate ion liquid to the dimethyl sulphoxide cosolvent is 2:1-1:5. The solvent is applicable to dissolving the cellulose.

Description

Technical field: [0001] The invention relates to a solvent, especially a solvent for dissolving cellulose at room temperature. Background technique: [0002] During application, most cellulose needs to be pre-dissolved. However, due to the huge hydrogen bond network between and within the cellulose molecules, cellulose is extremely difficult to dissolve in water and most organic solvents, which has become the biggest obstacle to the development and application of cellulose. Therefore, developing an effective cellulose solvent system is the key to solving this difficult problem. Over the years, people have been trying to find and develop a suitable solvent system that can dissolve cellulose. So far, the solvent systems that have been used in industry mainly include the viscose method (NaOH / CS 2 system) and N-methylmorpholine-N-oxide (NMMO) system. The viscose method is a traditional process for the production of viscose yarn and cellophane, which is still dominant at pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B1/00C08J3/09C08L1/02
Inventor 王键吉许爱荣樊静轩小朋
Owner HENAN NORMAL UNIV
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