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Method for preparing hot reversible gel gas separation membrane

A gas separation membrane and gel technology, applied in the field of membrane separation, can solve problems such as secondary pollution of the environment, and achieve the effects of less influencing factors, simple preparation process and simple preparation process

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the gel film is prepared by the solvent evaporation method, a large amount of organic solvent (up to 80-90% of the total film-making liquid) needs to be evaporated during the preparation process, which easily causes secondary pollution to the environment

Method used

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  • Method for preparing hot reversible gel gas separation membrane
  • Method for preparing hot reversible gel gas separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: A method for preparing a thermally reversible gel gas separation membrane, comprising the following process steps, the component ratios of which are in parts by weight:

[0021] (1) Preparation of film-making material: Mix 15 parts of polyvinylidene fluoride and 85 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, and melt blend at 130°C to obtain a uniform film-making material ; The molecular weight of the polymer is 5×10 4 ~5×10 6 ;

[0022] (2) Gel gas separation membrane forming: the membrane material is pressed into a flat liquid film with a thickness of 150 μm on a flat vulcanizing machine at a pressing temperature of 140° C., and the flat liquid film is solidified in a water bath at 20° C. for 1 hour to obtain As for the thermoreversible gel gas separation membrane, the thickness of the thermoreversible gel gas separation membrane is 150 μm.

[0023] Put the thermally reversible gel gas separation membrane obtained in Example 1 into the p...

Embodiment 2

[0029] Embodiment 2: A method for preparing a thermally reversible gel gas separation membrane, comprising the following process steps, and its component ratio is calculated in parts by weight:

[0030] (1) Preparation of film-making material: Mix 60 parts of poly(vinylidene fluoride-hexafluoropropylene) and 40 parts of 1-hexyl-3-methylimidazolium hexafluorophosphate, and melt blend at 180°C to obtain Uniform film-making material; the molecular weight of the polymer is 5×10 4 ~5×10 6 ;

[0031] (2) Gel gas separation membrane forming: The membrane material is pressed into a flat liquid film with a thickness of 450 μm on a flat vulcanizing machine at a pressing temperature of 190° C., and the flat liquid film is solidified in a water bath at 70° C. for 3 hours to obtain As for the thermoreversible gel gas separation membrane, the thickness of the thermoreversible gel gas separation membrane is 400 μm.

[0032] The thermally reversible gel gas separation membrane obtained in ...

Embodiment 3

[0033] Embodiment 3: A method for preparing a thermally reversible gel gas separation membrane, comprising the following process steps, and the component ratios are in parts by weight:

[0034] (1) Preparation of film-making material: Mix 25 parts of poly(vinylidene fluoride-hexafluoropropylene) and 75 parts of 1-octyl-3-methylimidazolium hexafluorophosphate, and melt blend at 160°C Obtain uniform film-making material; The molecular weight of described polymer is 5 * 10 4 ~5×10 6 ;

[0035] (2) Gel gas separation membrane forming: The membrane material is pressed on a flat vulcanizing machine to form a flat liquid film with a thickness of 450 μm, the pressing temperature is 180 ° C, and the flat liquid film is cured in a water bath at 40 ° C for 1 hour to obtain As for the thermoreversible gel gas separation membrane, the thickness of the thermoreversible gel gas separation membrane is 400 μm.

[0036] The thermally reversible gel gas separation membrane obtained in Example...

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Abstract

The invention relates to a method for preparing a hot reversible gel gas separation membrane, which is characterized by comprising the following processing steps of (1), preparing membrane preparation materials: mixing 15 to 60 parts by weight of polymer and 40-85 parts by weight of ionic liquid, fusing and blending the materials at 130 to 180 DEG C to obtain an uniform membrane preparation material; and (2), forming a gel gas separation membrane: pressing the membrane preparation material into a flat liquid membrane with a thickness of 150 to 450 microns by a flat vulcanizing machine, and solidifying the flat liquid membrane for 1 to 3 hours in a water bath at 20 to 70 DEG C to obtain the hot reversible gel gas separation membrane, wherein the temperature for pressing is 140 to 190 DEG C. A thermally induced phase separation method is adopted to prepare the hot reversible gel gas separation membrane; the preparation process is simple; the disclosed compound gel gas separation membrane has high gas permeability and separation selectivity, meanwhile the membrane also has high mechanical intensity and broad industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a thermally reversible gel gas separation membrane, belonging to the technical field of membrane separation. Background technique [0002] The increasing concentration of carbon dioxide in the atmosphere has led to global warming and caused a series of ecological and environmental problems. Therefore, the issue of carbon dioxide emissions has attracted more and more attention. In the past 20 years, countries around the world have conducted extensive research on the removal of carbon dioxide from mixed gases. The more effective methods include physical absorption, physical adsorption, chemical absorption, low temperature condensation and membrane separation. Membrane separation is mainly the process of separating the mixed gas by using the selective permeability of the polymer membrane material to the components of the gas mixture. The use of membrane separation technology to achieve carbon dioxide separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/34B01D53/22
Inventor 张春芳白云翔顾瑾孙余凭石幼婷
Owner JIANGNAN UNIV
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