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
CN101748515BActive Publication Date: 2011-06-01潍坊欣龙生物材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
潍坊欣龙生物材料有限公司
Publication Date
2011-06-01

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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