Cross-linked polyimide membranes for separations

A technology of polyimide membrane and polyimide, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve problems such as low permeability

Inactive Publication Date: 2015-07-22
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to control the degree of crosslinking of the thin selective layers of asymmetric gas separation membranes using UV radiation techniques, which result in very low permeabilities, although the selectivity is usually very high

Method used

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  • Cross-linked polyimide membranes for separations
  • Cross-linked polyimide membranes for separations
  • Cross-linked polyimide membranes for separations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of PAMAM 0.0 cross-linked DSDA-TMMDA polyimide membrane (PI-PAMAM-0.01)

[0025] A 1 wt% PAMAM 0.0 crosslinking solution was prepared by mixing 0.56 g of poly(amidoamine) generation 0.0 (PAMAM 0.0) dendrimer solution (62.35 wt% PAMAM 0.0 in methanol) and 34.44 g of DI. Preparation of low-selectivity, high-permeability porous asymmetric planar poly(3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride-3,3',5,5'-tetramethyl- 4,4'-Methylenedianiline) (DSDA-TMMDA) polyimide membrane was used for cross-linking studies, and the membrane had a temperature of 50 °C with 10% CO 2 and 90% CH 4 Mixed gas feed and 640GPU CO at 791kPa (100psig) 2 Permeability and CO of 1.72 2 / CH 4 selective. The skin surface of the DSDA-TMMDA membrane was contacted with 1 wt% PAMAM 0.0 crosslinking solution for 1 minute. The resulting film was then dried at 70°C for 1 hour.

[0026] The surface of the PAMAM 0.0-crosslinked DDSDA-TMMDA film was dip-coated with a 5 wt% RTV615A / 615B ...

Embodiment 2

[0028] Preparation of PAMAM 0.0 cross-linked DSDA-TMMDA polyimide membrane (PI-PAMAM-0.02)

[0029] A 2 wt% PAMAM 0.0 crosslinking solution was prepared by mixing 2.25 g of a poly(amidoamine) generation 0.0 (PAMAM 0.0) dendrimer solution (62.35 wt% PAMAM 0.0 in methanol) and 67.75 g of DI water. Preparation of low-selectivity, high-permeability porous asymmetric planar poly(3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride-3,3',5,5'-tetramethyl- 4,4'-Methylenedianiline) (DSDA-TMMDA) polyimide membrane was used for cross-linking studies, and the membrane had a temperature of 50 °C with 10% CO 2 and 90% CH 4Mixed gas feed and 640GPU CO at 791kPa (100psig) 2 Permeability and CO of 1.72 2 / CH 4 selective. The skinned surface of the DSDA-TMMDA membrane was contacted with 2 wt% PAMAM 0.0 crosslinking solution for 5 minutes. The resulting film was then dried at 70°C for 1 hour.

[0030] The surface of the PAMAM 0.0-crosslinked DDSDA-TMMDA film was dip-coated with a 5 wt% RT...

Embodiment 3

[0032] Preparation of "control" uncrosslinked DSDA-TMMDA polyimide membrane (PI-0.05)

[0033] will have at 50°C with 10% CO 2 and 90% CH 4 Mixed gas feed and 640GPU CO at 791kPa (100psig) 2 Permeability and CO of 1.72 2 / CH 4 Selective Low Selectivity High Permeability Porous Asymmetric Flat Sheet Poly(3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride-3,3',5,5'-tetramethyl The surface of the base-4,4'-methylene dianiline) (DSDA-TMMDA) polyimide film was dip-coated with a 5% by weight RTV615A / 615B silicone rubber solution. The coated membrane was dried in a fume hood at room temperature for 30 minutes, then at 70° C. for 1 hour. A 5 wt % RTV615A / 615B silicone rubber solution was prepared from 0.9 g of RTV615A, 0.1 g of RTV615B, and 19 g of hexane. Dried RTV615A / RTV615B coated DSDA-TMMDA polyimide membranes (abbreviated as PI-0.05) were cut into 7.6 cm diameter circles for permeation testing.

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Abstract

The present invention discloses new types of poly(amidoamine) (PAMAM) dendrimer-cross-linked polyimide membranes and methods for making and using these membranes. The membranes are prepared by cross-linking of asymmetric aromatic polyimide membranes using a PAMAM dendrimer as the cross-linking agent. The PAMAM-cross-linked polyimide membranes showed significantly improved selectivities for CO2 / CH4 compared to a comparable uncrosslinked polyimide membrane. For example, PAMAM 0.0 dendrimer-cross-linked asymmetric flat sheet poly(3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride-3,3′,5,5′-tetramethyl-4,4′-methylene dianiline) (DSDA-TMMDA) polyimide membrane showed CO2 permeance of 135.2 A.U. and CO2 / CH4 selectivity of 20.3. However, the un-cross-linked DSDA-TMMDA asymmetric flat sheet membrane showed much lower CO2 / CH4 selectivity (16.5) and higher CO2 permeance (230.8 GPU).

Description

[0001] Priority claims from earlier national applications [0002] This application claims priority to US Application No. 13 / 681,869, filed November 20, 2012. Background of the invention [0003] The present invention relates to a new class of poly(amidoamine) (PAMAM) dendrimer-crosslinked polyimide membranes and methods of making and using these membranes. The PAMAM-crosslinked polyimide membrane of the present invention is prepared by crosslinking an asymmetric aromatic polyimide membrane using a PAMAM dendrimer as a crosslinking agent. [0004] The present invention relates to a new class of poly(amidoamine) dendrimer-crosslinked polyimide membranes with high permeability and high selectivity for separations, especially natural gas upgrading. [0005] Membrane-based technologies have the advantages of low capital cost and high energy efficiency compared to conventional separation methods. Polymeric membranes have demonstrated successful operation in industrial gas separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64C07C7/144
CPCB01D2257/102B01D2257/304B01D2257/108Y02C10/10B01D2257/504B01D2256/24B01D53/228B01D53/22B01D71/64B01D2257/80B01D2257/11B01D2257/104Y02C20/40
Inventor C·刘H·Q·德兰
Owner UOP LLC
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