Xylene isomerization process and catalyst therefor
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United States of America Patent
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Apr 15, 2014
Grant Date -
Oct 27, 2011
app pub date -
Apr 6, 2011
filing date -
Apr 21, 2010
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Abstract
The invention concerns a xylenes isomerization process for the production of equilibrium or near-equilibrium xylenes. The process utilizes a catalyst comprising HZSM-5 or MCM-49 and process conditions including a temperature of less than 295° C. and a pressure sufficient to maintain the xylenes in liquid phase. In embodiments, the process can be operated in a continuous mode with ppm levels of dissolved H2 in the feed and in other embodiments in a cyclic mode without the H2 in feed but with periodic regenerations using a feed having low ppm levels of H2.
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