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Forward osmosis concentration method of ionic liquid water solution

An ionic liquid and aqueous solution technology, applied in reverse osmosis, chemical instruments and methods, semi-permeable membrane separation, etc., can solve the problem of limited concentration and achieve the effect of wide selection, universality and good recovery effect

Active Publication Date: 2018-11-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] This method adopts electrodialysis to concentrate the ionic liquid, although the operation is simple, it can only concentrate the ionic liquid aqueous solution to 5-30wt%, and the degree of concentration is limited.

Method used

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  • Forward osmosis concentration method of ionic liquid water solution
  • Forward osmosis concentration method of ionic liquid water solution
  • Forward osmosis concentration method of ionic liquid water solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]Prepare 1L of sodium chloride aqueous solution with a concentration of 6mol / L as the drawing solution, prepare 0.5L of 0.5mol / L aqueous solution of 1-butyl-3-methylimidazole chloride (M4) as the raw material solution, and transfer the two solutions to the corresponding raw material liquid storage tank. The separation membrane adopts commercial reverse osmosis membrane FilmTec BW30-4040 (DOW), the pump adopts peristaltic pump Masterflex L / S (Cole-Parmer), the cross-flow flow rate is set at 30L / h, the concentration time is 96h, and the circulation of the draw liquid and the raw material liquid are controlled. The cycle temperature was 30°C. Forward osmosis concentration performance is shown in Table 1.

Embodiment 2～5

[0052] The 1-butyl-3-methylimidazole chloride in embodiment 1 is replaced by 1-hexyl-3-methylimidazole chloride (M6), 1-octyl-3-methylimidazole chloride (M8 ), 1-decyl-3-methylimidazole chloride (M10), 1-dodecyl-3-methylimidazole chloride (M12), pyridinium chloride, and all the other conditions are the same as in Example 1. Forward osmosis concentration performance is shown in Table 1.

[0053] The forward osmosis concentration performance of table 1 embodiment 1~5

[0054]

Embodiment 6～9

[0056] In embodiment 1, 1-butyl-3-methylimidazole chloride is replaced by N-butylpyridine chloride (P4), M-hexylpyridine chloride (P6), N-octylpyridine chloride (P8) , N-decylpyridine chloride (P10), N-dodecylpyridine chloride (P12), and all the other conditions are the same as in Example 1. Forward osmosis concentration performance is shown in Table 2.

[0057] The forward osmosis concentration performance of table 2 embodiment 6~9

[0058]

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Abstract

The invention discloses a forward osmosis concentration method of an ionic liquid water solution. The forward osmosis concentration method comprises the step of enabling a to-be-concentrated ionic liquid water solution and absorbing liquid to respectively circularly flow through two sides of a forward osmosis film, wherein the osmotic pressure of the to-be-concentrated ionic liquid water solutionis lower than that of the absorbing liquid, the forward osmosis film is a thin-layer composite film with a polyamide active layer, a separating membrane with a codeposition active layer, a separatingfilm with a two-dimensional nanomaterial active layer or a forward osmosis separation film prepared from cellulose triacetate or sulfonated polyether sulfone. The effluent flux of a concentrated ionicliquid water solution can reach 5L.m<-2>.h<-1>-3L.m<-2>.h<-1>, the ionic liquid water solution can be concentrated to 70wt%-90wt%, so that the forward osmosis concentration method has huge application prospects in the recycling field of ironic liquid.

Description

technical field [0001] The invention relates to the technical field of ionic liquid aqueous solution concentration, in particular to a forward osmosis concentration method of ionic liquid aqueous solution. Background technique [0002] Ionic liquid (IL) is a kind of organic molten salt composed entirely of anions and cations, and most of them are liquid at room temperature. Compared with traditional organic solvents, ionic liquids have the advantages of non-volatile, non-flammable, high chemical and thermal stability, strong solubility, adjustable structure, wide electrochemical window, etc., and are known as a new type of "green solvent". It has a wide range of applications in chemical and chemical fields such as organic synthesis, catalysis, and electrochemistry. [0003] However, the high cost of ionic liquids limits their large-scale industrial application. In order to reduce the cost of using ionic liquids, it is urgent to recycle ionic liquids. [0004] At present, t...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D61/02
CPCB01D61/002B01D61/025B01D61/027B01D2313/28
Inventor 杨静刘畅徐志康
Owner ZHEJIANG UNIV
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