Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By cooling of liquid to obtain solid – e.g. – crystallization,...
Reexamination Certificate
2008-07-29
2008-07-29
Caldarola, Glenn (Department: 1797)
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By cooling of liquid to obtain solid, e.g., crystallization,...
Reexamination Certificate
active
07405340
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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Boyer Randy
BP Corporation North America Inc.
Caldarola Glenn
Yassen Thomas A.
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