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PIL (Polyionic Liquid) cross-linking gel gas separation membrane and preparation method thereof

A technology of polyionic liquid and gas separation membrane, applied in the field of polyionic liquid cross-linked gel gas separation membrane and its preparation, can solve the problem of poor gas permeability of polyionic liquid membrane, poor stability of ionic liquid membrane, and limited application range etc. to achieve good CO2 solubility, good gas diffusivity, and improved mechanical properties

Active Publication Date: 2018-11-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stability of the ionic liquid membrane is poor, and it is subjected to high operating pressure during use, and the inevitable leakage phenomenon limits its application range.
Compared with ionic liquids, polyionic liquids have similar chemical structures, and their effect on CO 2 It has high solubility and good stability, but the gas permeability of polyionic liquid membrane is poor

Method used

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  • PIL (Polyionic Liquid) cross-linking gel gas separation membrane and preparation method thereof
  • PIL (Polyionic Liquid) cross-linking gel gas separation membrane and preparation method thereof
  • PIL (Polyionic Liquid) cross-linking gel gas separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a polyionic liquid cross-linked gel gas separation membrane, comprising the steps of:

[0034] (1) Weigh 2.58g of formaldehyde, 6.31g of glyoxal, 5.05g of glacial acetic acid, 7.52g of deionized water and 3.71g of 1,4-butanediamine in a dry reaction vessel, and stir in an ice bath at 0°C Evenly, react at 100°C for 0.5h under stirring to obtain a homogeneous liquid, extract it with tetrahydrofuran, and distill the extract layer under reduced pressure to obtain a viscous dark brown polyionic liquid;

[0035] (2) Dissolve the polyionic liquid obtained in step (1) in deionized water, add 24.17 g of lithium bistrifluoromethanesulfonimide under stirring, the solution appears turbid and precipitates form, stir for 10 hours, filter , washed with pure water, filtered, and vacuum-dried, the obtained solid is called PIL for short, see figure 2 a in

[0036] (3) Get 4mL 20wt% PIL-methanol solution, add 0.026g trimethylolpropane triglycidyl ether, obtain m...

Embodiment 2

[0039] A preparation method of a polyionic liquid cross-linked gel gas separation membrane, comprising the steps of:

[0040] (1) Weigh 1g of formaldehyde, 3.2g of glyoxal, 3g of glacial acetic acid, 5g of deionized water and 1g of 1,4-butanediamine in a dry reaction vessel, stir evenly in an ice bath at 0°C, , stirred and reacted for 2.5 hours to obtain a homogeneous liquid, which was extracted with tetrahydrofuran, and the extract layer was distilled under reduced pressure to obtain a viscous dark brown polyionic liquid;

[0041] (2) Dissolve the polyionic liquid obtained in step (1) in deionized water, add 16.81 g of lithium bistrifluoromethanesulfonimide under stirring, the solution appears turbid and precipitates form, stir for 8 hours, filter , washed with pure water, filtered, and vacuum-dried, the obtained solid is called PIL for short, see figure 2 c in A;

[0042] (3) Take 1mL of 30wt% PIL-methanol solution, add 0.4g of 5-norbornene-2,3-dicarboxylic acid diglycidyl ...

Embodiment 3

[0045] A preparation method of a polyionic liquid cross-linked gel gas separation membrane, comprising the steps of:

[0046] (1) Weigh 5g of formaldehyde, 5.6g of glyoxal, 8g of glacial acetic acid, 6.9g of deionized water and 3.6g of 1,4-butanediamine in a dry reaction vessel, and stir evenly in an ice bath at 0°C. React at 20°C for 2 hours under stirring to obtain a homogeneous liquid, extract it with tetrahydrofuran, and distill the extract layer under reduced pressure to obtain a viscous dark brown polyionic liquid;

[0047] (2) Dissolve the polyionic liquid obtained in step (1) in deionized water, add 24.17 g of lithium bistrifluoromethanesulfonimide under stirring, the solution appears turbid and precipitates form, stir for 12 hours, filter , washed with pure water, filtered, and vacuum-dried, the obtained solid is called PIL for short;

[0048] (3) Take 10mL of 10wt% PIL-methanol solution, add 0.56g trimethylolpropane triglycidyl ether to obtain a mixed solution, add ...

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Abstract

The invention discloses a PIL (Polyionic Liquid) cross-linking gel gas separation membrane and a preparation method thereof. The preparation method comprises the following steps: (1) taking formaldehyde, oxalaldehyde, lacial acetic acid, deionized water and 1,4-butanediamine, and stirring in an ice bath, thus obtaining homogeneous liquid; extracting by using an extracting agent, and carrying out vacuum distillation, thus obtaining viscous dark brown PIL; (2) dissolving the PIL in the deionized water, adding trifluoromethane lithium sulfimide while stirring, precipitating, stirring, filtering,and washing, thus obtaining solid PIL; (3) taking a PIL-methanol solution, adding a cross-linking agent with epoxy functional groups, then adding 1-ethyl-3-methylimidazole bis(trifluoromethyl sulfonyl)imine salt, stirring, uniformly mixing, pouring on a glass plate, and heating under a vacuum condition, thus obtaining the PIL cross-linking gel gas separation membrane. The PIL cross-linking gel gasseparation membrane disclosed by the invention has the advantages that better CO2 disolubility and good gas diffusivity are obtained, CO2 / N2 gases can be quickly and effectively separated, and the like.

Description

technical field [0001] The invention relates to a polyionic liquid (PIL, Polyionic liquid) cross-linked gel gas separation membrane and a preparation method thereof. Background technique [0002] Combustion of fossil fuels produces large amounts of CO 2 and other greenhouse gases are directly discharged into the environment, causing serious climate problems, but CO 2 At the same time, it is an important carbon resource, which has a wide demand in the fields of industry, agriculture and chemical industry. CO in the atmosphere 2 Separation and capture to realize CO 2 Recycling and utilization of resources is a way to achieve a win-win situation between ecological environment protection and economic development. [0003] in CO 2 In the research of separation and capture, absorption separation, cryogenic distillation, adsorption separation, membrane separation and other methods have been relatively mature. Among them, the membrane separation method has attracted more and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D67/00B01D71/76
CPCB01D53/22B01D67/0006B01D71/76B01D2257/504Y02C20/40
Inventor 孟建强于云飞郝婷玉尹健
Owner TIANJIN POLYTECHNIC UNIV
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