Ionic liquid recycling method

An ionic liquid and recycling method technology, applied in rayon recycling, textile and papermaking, sustainable manufacturing/processing, etc., can solve the problems of low purity of recycled liquid, difficult industrial production, high recycling cost, and shorten the heating time and stay The effect of short time and improved utilization

Active Publication Date: 2011-06-01
潍坊欣龙生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method adopted in the above patents can concentrate or recover the ionic liquid, because the concentration of the ionic liquid is low (generally below 30wt%) before the ionic liquid is recovered by distillation, the energy consumption required for distillation is high and there is a recovery cost. High problem, or there are problems such as low recovery rate and low purity of recovered liquid, which is not easy for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Reclaim the mixed solution of spinning coagulation bath and refining washing liquid, the ionic liquid [BMIM]Cl concentration of the mixed solution is 5.2wt%, and the solution is passed through a PP filter element filter with a filter aperture of 5 microns to remove suspended impurities and particles and impurities such as sludge. The impurity-removed ionic liquid aqueous solution was concentrated with a reverse osmosis membrane at a pressure of 10.8Mpa and a temperature of 40°C to obtain a concentrated ionic liquid [BMIM]Cl with a concentration of 19.3%, and the concentrated water was reused in the production system. To the volume of 1m 3 Add concentrated liquid 0.62m to the salting-out separator 3 , and add 240Kg potassium phosphate (K 3 PO 4 ), stirred for 0.5 hour, left to stand for stratification and separation, obtained 108Kg of rich ionic liquid phase liquid, and the content of [BMIM]Cl in the rich ionic liquid phase was 82.6wt%, and the rich salt phase entered...

Embodiment 2

[0030] Reclaim the mixed solution of spinning coagulation bath and refining washing liquid, the ionic liquid [BMIM]Cl concentration of the mixed solution is 1.1wt%, and the solution is passed through a PP filter element filter with a filter aperture of 2 microns to remove suspended impurities and particles and impurities such as sludge. The impurity-removed ionic liquid aqueous solution was concentrated with a reverse osmosis membrane at a pressure of 6.7Mpa and a temperature of 35°C to obtain a 10.2% concentrated ionic liquid [BMIM]Cl, and the concentrated water was reused in the production system. To the volume of 1m 3 Add concentrated liquid 0.67m to the salting-out separator 3 , and add 280Kg potassium phosphate (K 3 PO 4 ), stirred for 0.5 hour, left to stand for stratification and separation, obtained 96Kg of rich ionic liquid phase liquid, and the content of [BMIM]Cl in the rich ionic liquid phase was 91.2wt%, and the rich salt phase entered the reverse osmosis syste...

Embodiment 3

[0032] Reclaim the mixed solution of spinning coagulation bath and refining washing liquid, the ionic liquid [BMIM]Cl concentration of the mixed solution is 3.6wt%, and the solution is passed through a PP filter element filter with a filter aperture of 10 microns to remove suspended impurities and particles and impurities such as sludge. The impurity-removed ionic liquid aqueous solution was concentrated with a reverse osmosis membrane at a pressure of 9.7Mpa and a temperature of 30°C to obtain a 15.4% concentrated ionic liquid [BMIM]Cl, and the concentrated water was reused in the production system. To the volume of 1m 3 Add concentrated liquid 0.58m to the salting-out separator 3 , and add 320Kg potassium phosphate (K 3 PO 4 ), stirred for 0.5 hour, left to stand for stratification and separation, obtained 89Kg of rich ionic liquid phase liquid, and the content of [BMIM]Cl in the rich ionic liquid phase was 82.8wt%, and the rich salt phase entered the reverse osmosis syst...

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Abstract

The invention discloses an ionic liquid recycling method. The ionic liquid recycling method includes the following steps of: (1) filtering and impurities removing are carried out on ionic liquid water solution recycled after spinning; (2) concentration treatment is carried out on the impurities-removed ionic liquid water solution by a reverse osmosis membrane under the pressure of 0.8 to 12MPa and the temperature of 15 to 45 DEG C; (3) the concentrated ionic liquid water solution is stirred after inorganic salt is added and is then stilly placed to layer into an anionic liquid phase and a negative salt phase, and the concentration of ionic liquid in the anionic liquid phase is equal to or higher than 80wt%; (4) reduced pressure distillation is carried out on the anionic liquid phase underthe pressure of lower than or equal to -0.08MPa and the temperature of 95 to 130 DEG C so as to obtain the ionic liquid with the concentration of equal to or higher than 98.5wt% and the water contentof lower than or equal to 1wt%. The ionic liquid recycling method is used for recycling the water-contained ionic liquid generated in the preparation process of cellulose or acrylonitrile fibers withthe ionic liquid as a solvent.

Description

technical field [0001] The invention relates to the recovery of ionic liquids, in particular to a method for recycling the aqueous ionic liquid solution generated during the preparation of cellulose or acrylonitrile fibers by using the ionic liquid as a solvent. Background technique [0002] Compared with traditional solvents, room temperature ionic liquids have a high boiling point, are non-volatile, can exist in a liquid state in a wide temperature range, and have the advantages of good thermal stability; Change its physical and chemical properties, it is a good solvent for many organic, inorganic and polymer materials. As a green solvent, ionic liquid is widely used in the fields of electrochemistry, organic synthesis, catalysis and separation, and is also a good solvent for many polymer polymerization reactions and processing, such as polyparaphenylene, polybutylene, polymethyl methacrylate Or polymerization reaction of polystyrene etc. For example, U.S. Patent 2002001...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F13/00
CPCY02P70/62
Inventor 逄奉建刘建华马君志姜明亮王东吴亚红
Owner 潍坊欣龙生物材料有限公司
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