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Cross-linked polybenzimidazole membrane for gas separation

a cross-linked polybenzimidazole and gas separation technology, applied in the direction of membranes, separation processes, membranes, etc., can solve the problems of low permeability or inadequate selectivity, large effort directed at identification, and little information available about gas separation using cross-linked polybenzimidazol

Inactive Publication Date: 2006-02-02
LOS ALAMOS NATIONAL SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to a new type of polymeric material that can be used for gas separation. This material is made by reacting polybenzimidazole with a crosslinking agent. The resulting material has a unique structure that allows it to effectively separate gas molecules based on their size and charge. The invention also includes methods for using this material for gas separation, as well as a specific method for separating carbon dioxide from a gas mixture. The technical effects of this invention include improved gas separation efficiency and the ability to produce a highly selective membrane for carbon dioxide separation."

Problems solved by technology

A drawback to the use of polymer membranes for gas separation can be their low permeability or inadequate selectivity.
Consequently, much effort is directed at identifying and developing polymers that are chemically and mechanically stable at elevated temperatures and high pressures.
While cross-linked polybenzimidazole has been shown to be useful for liquid separations (separations in acid waste streams, reverse osmosis separations, ion exchange separations, and ultrafiltration separations), there is little information available related to gas separation using cross-linked polybenzimidazole.

Method used

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  • Cross-linked polybenzimidazole membrane for gas separation
  • Cross-linked polybenzimidazole membrane for gas separation
  • Cross-linked polybenzimidazole membrane for gas separation

Examples

Experimental program
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Effect test

example

[0042] Ten grams of a membrane casting solution containing 20 weight percent (wt 15%) of a cross-linking agent was prepared by dissolving 0.8 gram of poly-2,2′-(m-phenylene)-5,5′bibenzimidazole (CELANESE CORPORATION, {overscore (M)}n=20×103, 0.78 μm-diameter polymer particles) and 0.2 gram of 3,4-dichloro-tetrahydro-thiophene-1,1-dioxide in 9 grams of N,N-dimethylacetamide. For this EXAMPLE, assuming complete reaction, the composition containing 20 weight percent of the cross-linking agent and 80 percent of the polymer would produce a 40 percent crosslinked neutral polymer product (slightly less than one equivalent of cross-linking agent per two imidazoles). The reaction between the polymer and crosslinking agent is shown below.

[0043] A 40 microliter (μl) aliquot of the solution was evenly spread on a stainless steel substrate (PALL CORPORATION). After drying at room temperature for 15 min. the resulting supported polymer film was heated to a temperature of 50 degrees Celsius for ...

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Abstract

A cross-linked, supported polybenzimidazole membrane for gas separation is prepared by reacting polybenzimidazole (PBI) with the sulfone-containing crosslinking agent 3,4-dichloro-tetrahydro-thiophene-1,1-dioxide. The cross-linked reaction product exhibits enhanced gas permeability to hydrogen, carbon dioxide, nitrogen, and methane as compared to the unmodified analog, without significant loss of selectivity, at temperatures from about 20 degrees Celsius to about 400 degrees Celsius.

Description

STATEMENT REGARDING FEDERAL RIGHTS [0001] This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. The government has certain rights in the invention.FIELD OF THE INVENTION [0002] The present invention relates generally to gas separation and more particularly to a cross-linked polybenzimidazole membrane used for gas separation. BACKGROUND OF THE INVENTION [0003] The last decade has seen a dramatic increase in the use of polymer membranes as effective, economical and flexible tools for many gas separations. The processability, gas solubility, and selectivity of several classes of polymers (such as polyimides, polysulfones, polyesters, and the like) have led to their use in a number of successful gas separation applications. A drawback to the use of polymer membranes for gas separation can be their low permeability or inadequate selectivity. In most instances, the success of a given membrane rests on achieving an approp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D53/22
CPCB01D53/228B01D67/0006B01D69/10B01D2325/20Y02C10/10B01D2323/30B01D71/62Y02C20/40B01D69/108
Inventor YOUNG, JENNIFER S.LONG, GREGORY S.ESPINOZA, BRENT F.
Owner LOS ALAMOS NATIONAL SECURITY
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