Process for producing a feed stream for a steam cracker
AssigneeUop LLC
InventorsMark P. Lapinski, Matthew Lippmann
Life of this patent
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Abstract
A process for producing a feed for a stream cracker. At least a portion of the C6 cyclic hydrocarbons are removed from a stream prior to it being passed into an isomerization zone. Disproportionation reaction selectivity is increased, producing valuable C3 hydrocarbons and C4 hydrocarbons. Also, a higher ring opening conversion of C5 cyclic hydrocarbons is observed. The yield may be adjusted by controlling an amount of C6 cyclic hydrocarbons passed to the isomerization zone. The catalyst in the isomerization zone is free of chloride, and the streams including effluent from the isomerization zone may be passed to a steam cracker without requiring chloride removal.
Claims12
A process for producing a feed for a steam cracker, the process comprising:
- separating a portion of C6 cyclic hydrocarbons from a naphtha stream comprising C5+ hydrocarbons to provide a C6 cyclic hydrocarbons lean stream;
- separating iC5 paraffinic hydrocarbons and iC6 paraffinic hydrocarbons from the C6 cyclic hydrocarbons lean stream;
- and,
- passing a feed stream comprising at least one stream being rich in iC5 paraffinic hydrocarbons, iC6 paraffinic hydrocarbons, or both to an isomerization zone containing non-chlorided catalyst comprising a sulfated zirconia or a tungstated zirconia to disproportionate at least some isoparaffins to form iC4, iC5 and iC6 paraffinic hydrocarbons, and isomerize iC4, iC5, and iC6 isoparaffins to normal paraffins to form an isomerization effluent;
- separating the effluent from the isomerization zone into an overhead stream comprising C4− hydrocarbons and a bottoms stream comprising C5+ hydrocarbons;
- and,
- passing at least one stream from the isomerization zone to a steam cracker.
Dependencies are inferred from the claim text.