초록 ▼

A cross-linked, supported polybenzimidazole membrane for gas separation is prepared by layering a solution of polybenzimidazole (PBI) and α,α′dibromo-p-xylene onto a porous support and evaporating solvent. A supported membrane of cross-linked poly-2,2′-(m-phenylene)-5,5′-bibenzimidazole unexpectedly

A cross-linked, supported polybenzimidazole membrane for gas separation is prepared by layering a solution of polybenzimidazole (PBI) and α,α′dibromo-p-xylene onto a porous support and evaporating solvent. A supported membrane of cross-linked poly-2,2′-(m-phenylene)-5,5′-bibenzimidazole unexpectedly exhibits an enhanced gas permeability compared to the non-cross linked analog at temperatures over 265° C.

대표청구항 ▼

1. A method for gas separation, comprising sending a gas mixture through a membrane comprising cross-linked polybenzimidazole.2. The method of claim 1, wherein the cross-linked polybenzimidazole is formed by reacting a polybenzimidazole with 1,4-C6H4XY, wherein X and Y are selected from the group co

1. A method for gas separation, comprising sending a gas mixture through a membrane comprising cross-linked polybenzimidazole.2. The method of claim 1, wherein the cross-linked polybenzimidazole is formed by reacting a polybenzimidazole with 1,4-C6H4XY, wherein X and Y are selected from the group consisting of CH2Cl, CH2Br, and CH2I.3. The method of claim 1, wherein the polybenzimidazole comprises poly-2,2′-(m-phenylene)-5,5′-bibenzimidazole.4. The method of claim 3, wherein the membrane is heated to a temperature of at least 265° C.5. The method of claim 1, wherein the membrane further comprises a porous support comprising a material selected from the group consisting of metals, metal alloys, ceramic materials, and combinations thereof.6. The method of claim 1, wherein the gas mixture comprises at least one gas selected from the group consisting of hydrogen sulfide, SO2, COS, carbon monoxide, carbon dioxide, nitrogen, hydrogen, and methane.7. The method of claim 1, wherein the membrane is heated to a temperature from about 25° C. to about 400° C.8. A method for separating carbon dioxide from a gas mixture, comprising sending a gas mixture that includes carbon dioxide through a membrane comprising cross-linked polybenzimidazole.9. The method of claim 8, wherein cross-linked polybenzimidazole comprises a cross-linked, polymeric reaction product of polybenzimidazole with 1,4-C6H4XY, wherein X and Y are selected from the group consisting of CH2Cl, CH2Br, and CH2I.10. The method of claim 8, wherein the membrane further comprises a porous support comprising a material selected from the group consisting of metals, metal alloys, ceramic materials, and combinations thereof.11. The method of claim 8, wherein the gas mixture comprises at least one hydrocarbon.12. The method of claim 8, wherein the gas mixture comprises methane.13. The method of claim 8, further comprising heating the membrane to a temperature from about 25° C. to about 400° C.14. The method of claim 8, wherein the cross-linked polybenzimidazole comprises the reaction product of poly-2,2′-(m-phenylene)-5,5′-bibenzimidazole and 1,4-C6H4X2 wherein X is CH2Br.15. The method of claim 14, wherein the membrane is heated to a temperature of at least 265° C.16. A membrane comprising a cross-linked, polymeric reaction product of a polybenzimidazole and 1,4-C6H4XY, wherein X and Y are selected from the group consisting of CH2Cl, CH2Br, and CH2I.17. The membrane of claim 16, wherein X and Y are CH2Br.18. The membrane of claim 16, further comprising a porous support for supporting said cross-linked polymeric reaction product, wherein said porous support comprises a material selected from the group consisting of metal, metal alloy, ceramic material, and combinations thereof.19. The membrane of claim 16, wherein said polybenzimidazole comprises poly-2,2′-(m-phenylene-5,5′bibenzimidazole).20. A cross-linked membrane prepared by layering a solution of solvent, polybenzimidazole and 1,4-C6H4XY, wherein X and Y are selected from the group consisting of CH2Cl, CH2Br, and CH2I, on porous support and evaporating the solvent.21. The membrane of claim 20, wherein the solution comprises 1,4-C6H4XY in an amount from greater than zero weight percent to about 45 weight percent based on the weight of polybenzimidazole.