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Polyamide-polyimide coalbed methane denitrification concentration separation membrane with carboxylic acid group

A technology of polyimide and carboxylic acid groups, which is applied in the field of polyamide-polyimide coalbed methane denitrification concentration separation membrane and its preparation, can solve the problems of poor separation effect, reduce the procedure and significantly save energy effect, the effect of high economic and practical value

Active Publication Date: 2020-08-11
山西格瑞思科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is N 2 、CH 4 The separation effect is poor

Method used

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  • Polyamide-polyimide coalbed methane denitrification concentration separation membrane with carboxylic acid group
  • Polyamide-polyimide coalbed methane denitrification concentration separation membrane with carboxylic acid group
  • Polyamide-polyimide coalbed methane denitrification concentration separation membrane with carboxylic acid group

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preparation example Construction

[0052] The present invention also provides the preparation method of the above-mentioned polyamide-polyimide coal bed gas denitrification concentration separation membrane with carboxylic acid group, the preparation method comprises steps:

[0053] S100. The polyamide-polyimide compound is prepared by using diamine I, diamine II, dianhydride, and diacid chloride, and the diamine II is a diamine with a carboxyl group;

[0054] S200, using the polyamide-polyimide compound obtained in step S100 to prepare a casting solution;

[0055] S300, using the casting solution obtained in step S200 to prepare a hollow fiber membrane through a phase inversion method, the polyamide-polyimide coalbed gas denitrification concentration separation membrane with carboxylic acid groups.

[0056] In this way, after dissolving two diamines with different structures and polarities, dianhydride and diacid chloride are added for reaction at the same time. After the first step reaction is completed, tolu...

Embodiment 1

[0085] (1) Add 5.4g of p-phenylenediamine, 7.6g of 3,5-diaminobenzoic acid, 10.0g of triethylamine into the reactor which has been dehydrated beforehand, add 135.6g of N,N-dimethylformamide and stir Dissolve, cool to -10°C, add 4,4'-diacid chloride diphenyl ether and 14.7g and 4,4'-(hexafluoroisopropylene) diphthalic anhydride 22.2g alternately in four times, continue to react for 24h after the addition is complete After the first step of reaction is completed, add a water separator to the device, add 17.4g of toluene at the same time, heat to 150°C to continue the reaction for 4h, distill off the toluene, and precipitate the remaining solution in methanol to obtain a light yellow filamentous solid. Vacuum Dry and set aside.

[0086] (2) Weigh 20g of the polymer obtained in step (1), 2g of polyethylene glycol, 10g of isopropanol, 2g of tetrahydrofuran, 0.1g of sodium dodecylbenzenesulfonate, and add to 62.7g N,N- Dimethylformamide was heated to 50°C, stirred and dissolved to ...

Embodiment 2

[0090](1) Add 5.4g of m-phenylenediamine, 7.6g of 3,4-diaminobenzoic acid, 10.0g of triethylamine into the reactor which has been dehydrated beforehand, add 135.6g of N,N-dimethylformamide and stir Dissolve, cool to -10°C, add 4,4'-benzil chloride and 13.9g and 3,3',4,4'-benzophenone tetracarboxylic dianhydride 16.1g alternately in four times, continue to React for 24 hours. After the first step of reaction is completed, add a water separator to the device, add 17.4 g of toluene at the same time, heat to 150 ° C and continue the reaction for 4 hours, distill the toluene, and precipitate the remaining solution in methanol to obtain a light yellow filamentous solid , vacuum dried for later use.

[0091] (2) Weigh 20g of the polymer obtained in step (1), 2g of polyethylene glycol, 10g of isopropanol, 2g of tetrahydrofuran, 0.1g of sodium dodecylbenzenesulfonate, and add to 62.7g N,N- Dimethylformamide was heated to 50°C, stirred and dissolved to prepare a casting solution.

[0...

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Abstract

The invention provides a polyamide-polyimide coalbed methane denitrification and concentration separation membrane with a carboxylic acid group and a preparation method and application thereof. Materials of the denitrification concentration separation membrane comprise a polyamide-polyimide compound. The polyamide-polyimide compound is formed by alternate block polymerization of polyamide structural units and polyimide structural units, the carboxylic acid group is implanted into molecular chains by adding diamine containing the carboxylic acid groups, the molar fraction of the polyamide unitsis 5-60, and the molar fraction of the polyimide units is 95-40. The carboxylic acid group is implanted into the molecular chain by adding diamine with the carboxylic acid groups to adjust the polarity of the polymer chain, and the prepared denitrification concentration separation membrane enables nitrogen to permeate preferentially; in the process of nitrogen removal and methane concentration ofcoalbed methane, methane is still located on the high-pressure side while being concentrated, the nitrogen removal and concentration separation membrane has high gas permeability due to the rigid-flexible alternate structure, and thus the nitrogen removal and concentration separation membrane has the obvious energy-saving effect and high economic and practical value.

Description

technical field [0001] The invention relates to the technical field of denitrification concentration separation membrane, in particular to a polyamide-polyimide coalbed gas denitrification concentration separation membrane with carboxylic acid groups and its preparation method and application. Background technique [0002] Coalbed methane is commonly known as "coal mine gas", and its main component is methane (CH 4 ), is an unconventional natural gas resource that is associated with coal and exists in coal seams in an adsorbed or free state, and is an efficient and clean new energy source. [0003] According to different mining methods, CH in coalbed methane 4 The concentration is between 3% and 80%, and about two-thirds of the coalbed methane contains CH 4 The concentration is lower than 30%, which belongs to low concentration coalbed methane. The main factor that has always troubled the large-scale utilization of coalbed methane is that the concentration of combustible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/64B01D67/00C10L3/10
CPCB01D71/56B01D71/64B01D67/0006C10L3/105
Inventor 廖家友尹昌海李智杰谢军焦宏
Owner 山西格瑞思科技有限公司
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