Process for recovering paraxylene utilizing ammonia absorption refrigeration
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United States of America Patent
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Jul 29, 2008
Grant Date -
Oct 13, 2005
app pub date -
Apr 1, 2004
filing date -
Apr 1, 2004
priority date (Note) -
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Abstract
A process for recovering paraxylene from a substantially hydrocarbon feedstock. The recovery comprises cooling the hydrocarbon feedstock in at least one refrigerated crystallization stage that is indirectly refrigerated by evaporating at least a portion of a substantially liquid stream comprising ammonia. The crystallization stage may also be cooled by an ethylene refrigerant, which has been cooled by heat exchange with a substantially liquid stream comprising ammonia. The process further comprises a series of cooling substeps. This invention is also directed to an ammonia absorption refrigeration process powered by an enthalpy source from or near a paraxylene recovery unit.
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