Solvent recovery method for cellulose fiber preparation with ion liquid as solvent

A technology of cellulose fibers and ionic liquids, which is applied in the fields of rayon recycling, fiber chemical characteristics, and final product manufacturing, can solve the problems of complex synthesis and purification processes and high production costs, and achieve environmental protection and reduce production costs. Effect of saving resources and energy

Inactive Publication Date: 2006-07-19
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But the ionic liquids [BMIM]Cl and [BMIM]BF 4 The synthesis and purification process is complicated and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] With [BMIM]Cl and [BMIM]BF 4 The molar ratio is 8: 2 ionic liquid mixed solution as solvent, the spinning solution solution of preparation wood pulp 8% carries out wet spinning, uses 20% mixed solution-water solution as coagulant, after spinning for a period of time, take out 1000g Coagulation bath, learn after chemical titration that this 1000g mixed solution contains about 277.6g of ionic liquid mixed solution.

[0022] Add 2000g of water to 1000g of the mixture, stir well.

[0023] Use a 0.22 μm microporous membrane to filter under reduced pressure.

[0024] Under the condition of 150 Pa, distilled under reduced pressure at 95° C. for 2 hours, then distilled under normal pressure at 120° C. for 2 hours, finally obtained about 270.4 g of the ionic liquid mixture, with a recovery rate of 97.41%.

example 2

[0026] With [BMIM]Cl and [BMIM]BF 4 The ionic liquid mixed solution with a molar ratio of 7:3 is used as a solvent to prepare a 7% spinning solution of bamboo pulp for wet spinning, and 18% mixed solution-water solution is used as a coagulant. After spinning for a period of time, 1000g of bamboo pulp is taken out Coagulation bath, learn after chemical titration that this 1000g mixed solution contains about 203.5g of ionic liquid mixed solution.

[0027] Add 2000g of water to 1000g of the mixture, stir well.

[0028] Use a 0.22 μm microporous membrane to filter under reduced pressure.

[0029] Under the condition of 150 Pa, distilled under reduced pressure at 95° C. for 2 hours, then distilled under normal pressure at 120° C. for 2 hours, finally obtained about 200.1 g of the ionic liquid mixture, with a recovery rate of 98.33%.

[0030] Tests have proved that the recovered ionic liquid mixture has high purity and can be recycled, so this recovery method has high use value.

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PUM

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Abstract

The invention provides a solvent recovery method in the cellulose fiber preparation process by using ionic liquid as the solvent, which comprises subjecting coagulating bath components to precipitation, filtration, vacuum distillation and normal atmosphere distillation.

Description

technical field [0001] The present invention relates to a kind of recovery method of the solvent in the cellulose fiber preparation of a kind of ionic liquid as solvent, specifically relate to a kind of ionic liquid [BMIM]Cl and [BMIM]BF 4 Method for solvent recovery of mixed liquor as solvent in cellulose fiber preparation process. technical background [0002] Cellulose is a renewable resource that is ubiquitous in nature. Trees, cotton, rice stalks, corn and other plants and some bacterial secretions contain a lot of cellulose. Cellulose fibers may become a renewable resource to replace petroleum-based fibrous products. At present, the production of cellulose fiber mainly uses sodium hydroxide, acetone, carbon disulfide, etc. as solvents and additives, and the cellulose used needs to be yellowed, aged and matured, and it also involves formaldehyde, sulfite, sodium sulfide, sulfuric acid And chemical reagents such as zinc sulfate, all of the above-mentioned organic reag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F13/02
CPCY02P70/62
Inventor 王华平刘崴崴李达屠晓萍赵天瑜杨斌张玉梅郁铭芳
Owner DONGHUA UNIV
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