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United States Patent Application

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A PBI compound includes imidazole nitrogens at least a portion of which are substituted with a moiety containing a carbonyl group, the substituted imidazole nitrogens being bonded to carbon of the carbonyl group. At least 85% of the nitrogens may be substituted. The carbonyl-containing moiety may include RCO--, where R is alkoxy or haloalkyl. The PBI compound may exhibit a first temperature marking an onset of weight loss corresponding to reversion of the substituted PBI that is less than a second temperature marking an onset of decomposition of an otherwise identical PBI compound without the substituted moiety. The PBI compound may be included in separatory media. A substituted PBI synthesis method may include providing a parent PBI in a less than 5 wt % solvent solution. Substituting may use more than 5 equivalents in relation to the imidazole nitrogens to be substituted.
Klaehn, John R. (Idaho Falls, ID), Peterson, Eric S. (Idaho Falls, ID), Orme, Christopher J. (Shelley, ID), Jones, Michael G. (Chubbuck, ID), Wertsching, Alan K. (Idaho Falls, ID), Luther, Thomas A. (Idaho Falls, ID), Trowbridge, Tammy L. (Idaho Falls, ID)
11/ 933,604
November 1, 2007
GOVERNMENT RIGHTS [0002] The United States Government has certain rights in this invention pursuant to Contract No. DE-AC07-991D13727, and Contract No. DE-AC07-051D14517 between the United States Department of Energy and Battelle Energy Alliance, LLC.