Ionic liquid and forward osmosis process using same

An ionic liquid, forward osmosis technology, applied in the field of forward osmosis process, can solve the problems of high energy consumption and toxicity, and achieve the effects of low energy consumption, high hydrophilicity, and low film blocking rate

Active Publication Date: 2021-07-16
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although many extracts can generate a sufficiently high osmotic pressure, they are not suitable for practical promotion due to high energy consumption and toxicity

Method used

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  • Ionic liquid and forward osmosis process using same
  • Ionic liquid and forward osmosis process using same
  • Ionic liquid and forward osmosis process using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First, synthesize (2-hydroxyethyl) octyl diethylammonium bromide ((2-hydroxyethyl) octyldiethylammonium bromide according to the following steps, the structure is ) (hereinafter referred to as [Ch228][Br]):

[0047] Add 52 grams of (2-hydroxyethyl) diethylamine (0.44 mole), 85 grams of (1-octylbromide) (0.44 mole), and 150 milliliters of acetonitrile into a reaction flask, And the resulting mixture was stirred at 80°C for 24 hours. After cooling down to room temperature, the obtained product was slowly dropped into 1.5 L of diethylether, and a white solid was observed to precipitate. After filtering, the obtained filter cake is dried to obtain (2-hydroxyethyl)octyldiethylammonium bromide ([Ch228][Br]).

[0048] Next, [Ch228][Br] is converted into (2-hydroxyethyl)octyldiethyl ammonium hydroxide (2-hydroxyethyl)octyldiethyl ammonium hydroxide by ion exchange resin, the structure is ) (hereinafter referred to as [Ch228][OH]). Then, 82.8 grams of [Ch228][OH] (0.335mol...

Embodiment 2

[0057] First, 1,8-octanediyl-bis((2-hydroxyethyl)diethylammonium bromide (1,8-octanediyl-bis((2-hydroxyethyl)diethylammonium)dibromide) was synthesized according to the following steps, the structure for ) (hereinafter referred to as [DCh8-22] [Br 2 ]):

[0058] 52 grams of (2-hydroxyethyl) diethylamine ((2-hydroxyethyl) diethylamine) (0.44mole), 60 grams of 1,8-dibromooctane (1,8-dibromooctane) (0.22mole), and 100 mL of acetonitrile was added to a reaction flask, and the resulting mixture was stirred at 80° C. for 24 hours. After cooling down to room temperature, the obtained product was slowly dropped into 1.5 L of diethyl ether, and a white solid was observed to precipitate. After filtering, the resulting filter cake is dried to obtain 1,8-octanediyl-bis((2-hydroxyethyl) diethylammonium bromide ([DCh8-22][Br 2 ]).

[0059] Next, [DCh8-22][Br 2 ] into (2-hydroxyethyl)octyldiethyl ammonium hydroxide ((2-hydroxyethyl)octyldiethyl ammonium hydroxide, the structure is )...

Embodiment 3

[0064] Add 100 grams of choline hydroxide aqueous solution (46 wt%, dissolved in water) (0.38 mole of choline) into a reaction flask. Next, 74.42 grams of azelaic acid (nonanedioic acid) was slowly added into the reaction flask. After reacting at room temperature for 24 hours, the resulting solution was extracted with 200 ml of dichloromethane, and the organic layer was collected. After removing water and concentrating, obtain product ionic liquid (III) (structure is Hereinafter referred to as [Ch][Aze]. [Ch][Aze] was analyzed by NMR spectroscopy, the results are as follows: 1 H-NMR (500MHz in D 2 O):1.17(m,6H,-CH 2 -), 1.41(m,4H,-CH 2 -), 2.10(t,4H, - OOCCH 2 -), 3.03(s,9H,N + CH 3 ), 3.35(t,2H,N + CH 2 CH 2 -), 3.90(m,2H,-CH 2 OH).

[0065] After mixing the ionic liquid [Ch][Aze] with water in different weight ratios, let it stand at room temperature for a period of time, observe whether phase separation occurs, and record its critical solution temperature, th...

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Abstract

The present disclosure provides an ionic liquid. The ionic liquid has a structure as shown in a formula (I): ABn, wherein n is 1 or 2; m is 0 or an integer among 1 to 7; R1 and R2 are independently methyl or ethyl; k is an integer from 3 to 8; i is independently 1, 2 or 3; and j is 5, 6, or 7. The ionic liquid has the advantages of high molecular weight, high hydrophilicity, biocompatibility, low biotoxicity, low preparation cost, high environmental friendliness and the like. The invention also provides a forward osmosis process using the ionic liquid. The forward osmosis procedure is to desalinate a brine in a forward osmosis (FO) mode with an extract containing an ionic liquid. The forward osmosis procedure has the advantages of high flux, low energy consumption, low film blocking rate, low solute reverse diffusion and the like.

Description

technical field [0001] The present disclosure relates to an ionic liquid and a forward osmosis process using the same. Background technique [0002] The technical principle of the forward osmosis (FO) desalination process is to use the osmotic pressure difference between the solution or solute at both ends of the semipermeable membrane as the driving force, that is, to make the water at the feed water end with low osmotic pressure permeate through the Through the semi-permeable membrane to the high osmotic pressure draw solution (draw solution) end. The mixed solution of water and extract that passes through the semipermeable membrane can be separated from the extract by various methods of separation and concentration, so as to recover the extract and produce pure water. The advantages of forward osmosis technology applied to water treatment are low energy consumption and low membrane blocking rate, which can greatly improve functional stability and cost-effectiveness. [...

Claims

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Application Information

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IPC IPC(8): C07C215/40C07F9/09C07C55/16B01D61/00
CPCC07C215/40C07F9/09C07C55/16B01D61/002Y02A20/131
Inventor 刘柏逸邵信张敏超陈意君黄琼慧何佳桦王钧逸洪仁阳
Owner IND TECH RES INST
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