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Homogeneous phase modifying method for cellulose in ion liquid

An ionic liquid and cellulose technology, applied in the field of cellulose, can solve the problems of difficult cellulose homogeneous modification, and achieve the effect of short modification time and easy operation.

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, at present, the homogeneous modification of cellulose in ionic liquids mainly focuses on derivatization with liquid modification reagents, such as acetylation, and when solid reagents are used, it takes a certain amount of time for the solid reagents to dissolve in the modification system. , it is difficult to achieve homogeneous modification of cellulose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (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;

[0024] (2) With ionic liquid 1-butyl-3-methyl imidazole chloride ([C 4 mim]Cl) as solvent, at 80℃, dry bagasse cellulose and [C 4 When the mass ratio of mim]Cl was 0.2:100, bagasse cellulose was added to [C 4 mim]Cl, the ionic liquid solution of bagasse cellulose was obtained by dissolving for 1 h under the condition of blocking moisture and stirring.

[0025] (3) Add dimethyl sulfoxide to the ionic liquid solution of bagasse cellulose according to the ratio of 1mL dimethyl sulfoxide / 10g ionic liquid to reduce the viscosity of the solution, mix it into a cellulose solution, and then add a portion of the same volume of dimethyl sulfoxide Pre-dissolve succinic anhydride in methyl sulfoxide (the molar ratio of succinic anhydride to cellulose anhydroglucose unit is 4:1), add it to the cellulose solution, and modify the cellulose under...

Embodiment 2

[0029] (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 cellulose;

[0030] (2) With the ionic liquid 1-butyl-3-methyl imidazole chloride ([C4mim]Cl) as solvent, dry eucalyptus wood cellulose and [C 4 Under the condition that the mass ratio of mim]Cl was 1.5:100, the eucalyptus wood cellulose was added to [C 4 mim]Cl, the ionic liquid solution of eucalyptus cellulose was obtained by dissolving for 8 h under the condition of blocking moisture and stirring.

[0031] (3) Add dimethyl sulfoxide in the ionic liquid solution of eucalyptus wood cellulose according to the ratio of 3mL dimethyl sulfoxide / 10g ionic liquid to reduce the viscosity of the solution, mix it into a cellulose solution, and then mix it in a portion of the same volume Dissolve succinic anhydride in dimethyl sulfoxide in advance (the molar ratio of succinic anhydride to cellulose anhydroglucose unit is 2:1), add it to the cellulose ...

Embodiment 3

[0035] (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;

[0036] (2) With ionic liquid 1-butyl-3-methyl imidazole chloride ([C4 mim]Cl) as solvent, at 90°C, dry wheat straw cellulose and [C 4 The mass ratio of mim]Cl was 2.5:100 when wheat straw cellulose was added to [C 4 mim]Cl, the ionic liquid solution of wheat straw cellulose was obtained by dissolving for 10 h under the condition of blocking moisture and stirring.

[0037] (3) In the ionic liquid solution of wheat straw cellulose, according to the ratio of 2mL dimethyl sulfoxide / 10g ionic liquid, add dimethyl sulfoxide to reduce the viscosity of the solution, mix it into a cellulose solution, and then mix it in a portion of the same volume Pre-dissolve phthalic anhydride in dimethyl sulfoxide (the molar ratio of phthalic anhydride to cellulose anhydroglucose unit is 8:1), add it to the cellulose solution, and treat under the ...

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Abstract

The invention discloses a method of cellulose homogeneous-phase modification in ionic liquid. The method comprises the following steps: firstly, the cellulose is dried to obtain dry cellulose; then the dry cellulose is added in the ionic liquid and is dissolved to obtain the ionic liquid solution of the cellulose under the conditions of moisture isolation and stirring; the dimethyl sulfoxide is added in the cellulose solution to reduce the solution viscosity, and the solid modification reagent dissolved in the dimethyl sulfoxide in advance is added in the cellulose solution for cellulose modification; and finally the modified cellulose ionic liquid solution is added with organic solvent or water for cellulose regeneration, the sediment is leached, and 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 and good in effect. The invention is suitable for cellulose homogeneous-phase modification of the solid modification reagent in the ionic liquid.

Description

technical field [0001] The invention belongs to the field of cellulose, in particular to a method for homogeneously modifying cellulose in an ionic liquid. Background technique [0002] As the most abundant renewable resource in nature, the total amount of cellulose in the plant kingdom is about 2.6×10 12 t, in addition, about 1.0×10 cellulose is newly produced through photosynthesis in the world every year 11 t. At present, cellulose materials have been widely used in many industrial fields such as fibers, papermaking, films, polymers, coatings, etc., but their 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/12C08B3/14
Inventor 刘传富张爱萍孙润仓
Owner SOUTH CHINA UNIV OF TECH
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