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Method for preparing cellulose succinate in ion liquid

An ionic liquid and succinate technology, applied in the field of cellulose, can solve the problems of low substitution degree of cellulose succinate and limit the industrial application of cellulose, and achieve high substitution degree, short modification time and easy operation. Effect

Inactive Publication Date: 2009-08-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the homogeneous succinylation of cellulose in ionic liquids results in a low degree of substitution of cellulose succinate, which limits the industrial application of cellulose.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Place the bagasse cellulose in an oven at 50°C to keep the air circulation and dry for 16 hours to obtain the absolute dry cellulose;

[0026] (2) With the ionic liquid 1-butyl-3-methylimidazole chloride as a solvent, the dry bagasse cellulose is added to the ionic liquid at 85 ° C and the mass percentage of the dry bagasse cellulose and the ionic liquid is 0.2%. In the liquid, the ionic liquid solution of bagasse cellulose is obtained by dissolving for 1 hour under the condition of cutting off moisture, and the dissolution process is kept uniformly stirred;

[0027] (3) add dimethyl sulfoxide to the ionic liquid solution of cellulose according to the ratio of 1mL dimethyl sulfoxide / 10g ionic liquid in the ionic liquid solution of bagasse cellulose, to reduce the solution viscosity, mix into cellulose solution, and then Pre-dissolve solid succinic anhydride (2:1 molar ratio to cellulose anhydroglucose units) and NBS (1:100 mass ratio to succinic anhydride) in an equ...

Embodiment 2

[0031] (1) Place the eucalyptus cellulose in an oven at 60° C. to keep the air circulation and dry for 12 hours to obtain the absolute dry eucalyptus cellulose;

[0032] (2) With the ionic liquid 1-butyl-3-methyl imidazole chloride as a solvent, the dry eucalyptus cellulose was prepared under the condition that the mass percent of the dry eucalyptus cellulose and the ionic liquid was 2% at 100° C. Add it to the ionic liquid, and dissolve it for 8 hours under the condition of cutting off moisture to obtain the ionic liquid solution of eucalyptus wood cellulose, and keep uniform stirring during the dissolution process;

[0033] (3) add dimethyl sulfoxide to the ionic liquid solution of cellulose according to the ratio of 4mL dimethyl sulfoxide / 10g ionic liquid in the ionic liquid solution of eucalyptus wood cellulose, to reduce the solution viscosity, mix into cellulose solution, Then pre-dissolve solid succinic anhydride (the molar ratio to cellulose anhydroglucose unit is 4:1)...

Embodiment 3

[0037] (1) Place the wheat straw cellulose in an oven at 55°C to keep the air circulation and dry for 14 hours to obtain the dry wheat straw cellulose;

[0038] (2) With the ionic liquid 1-butyl-3-methylimidazole chloride as a solvent, the dry wheatgrass cellulose was added to the ionic liquid at 130°C and the mass percentage of the dry wheatgrass cellulose and the ionic liquid was 2.5%. In the liquid, dissolve under the condition of cutting off the moisture for 15 hours to obtain the ionic liquid solution of wheat straw cellulose, and keep uniform stirring during the dissolution process;

[0039](3) Add dimethyl sulfoxide to the ionic liquid solution of cellulose according to the ratio of 5mL dimethyl sulfoxide / 10g ionic liquid in the ionic liquid solution of wheat straw cellulose, to reduce the solution viscosity, mix into cellulose solution, and then Pre-dissolve solid succinic anhydride (8:1 molar ratio to cellulose anhydroglucose units) and catalyst NBS (20:100 mass ratio...

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Abstract

The invention discloses a method for preparing the cellulose succinate in ionic liquid. The method takes NBS as the catalyst and comprises the following steps: firstly, the dry cellulose is added in the ionic liquid, and then the cellulose is dissolved to obtain cellulose ionic liquid solution under the conditions of moisture isolation and stirring; the dimethyl sulfoxide is added in the cellulose solution to reduce the solution viscosity, and the modifying agent (butanedioic anhydride) dissolved in the dimethyl sulfoxide in advance and the catalyst (NBS) are added in the cellulose solution for cellulose modification; and finally, the isopropyl alcohol is added in the modified cellulose ionic liquid solution for cellulose regeneration, the sediment is leached, and then the sediment is cleaned and dried to obtain cellulose derivative. The adopted cellulose homogeneous-phase modification method is simple and convenient in operation, short in time, good in effect and high in degree of substitution of the cellulose. The invention has an important significance in the preparation of the novel industrial material and the novel derivative of the cellulose.

Description

technical field [0001] The invention belongs to the field of cellulose, in particular to a method for preparing cellulose succinate in ionic liquid. Background technique [0002] As the most abundant renewable resource in nature, cellulose has been widely used in many industrial fields such as fiber, papermaking, film, polymer, coating, etc., but its application potential has not been fully developed. In recent years, as the total amount of non-renewable fossil resources such as petroleum and coal has been decreasing, the importance of cellulose renewable resources has become increasingly significant. Especially since the 1980s, as people have paid more and more attention to environmental pollution, many countries, especially developed countries, have listed the transformation and utilization of renewable resources such as cellulose as a major strategy for economic and social development. [0003] From the chemical structure point of view, cellulose is a linear high polymer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/12
Inventor 刘传富张爱萍孙润仓
Owner SOUTH CHINA UNIV OF TECH
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