Process for increasing xylene isomer to benzene ratio
AssigneeUop LLC
InventorsRajeswar R. Gattupalli, Mohamed S. M. Shakur, Naiyl A. Rashid
Life of this patent
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Abstract
Apparatuses and processes are provided for regulating C7 and C8 feed to an aromatics complex to increase the ratio of a selected xylene isomer to benzene ratio. Reformate may be split into three cuts in a splitter column. A side cut stream comprises predominantly C7 hydrocarbons and a bottoms steam from the splitter column comprises predominantly C8+ hydrocarbons. The relative proportion of the C7 and C8+ hydrocarbon streams sent to the aromatics complex are metered to determine the resulting ratio of a selected xylene isomer to benzene produced by the aromatics complex.
Claims20
A process for producing aromatics in an aromatics complex comprising:
- fractionating a naphtha stream to provide a C7 stream and a C8+ aromatics stream;
- feeding a first C7 stream taken from the C7 stream to the aromatics complex comprising an aromatics extraction unit, a BTX fractionation zone, a xylene fractionation zone, and a transalkylation unit and/or an isomerization unit;
- feeding a first C8+ aromatics stream taken from the C8+ aromatics stream to the aromatics complex;
- and
- feeding a second C7 stream taken from the C7 stream away from the aromatics complex;
- or
- feeding a second C8+ aromatics stream taken from the C8+ aromatics stream away from the aromatics complex.
A process for producing aromatics in an aromatics complex comprising an aromatics extraction unit, a BTX fractionation zone, a xylene fractionation zone, and a transalkylation unit and/or an isomerization unit, the process comprising the steps of:
- fractionating a naphtha stream to provide an intermediate stream and a heavy stream;
- feeding a first intermediate stream taken from the intermediate stream to an aromatics extraction unit to extract a raffinate stream from a toluene stream;
- feeding all or a first portion of the heavy stream to a xylene column;
- and
- feeding a second intermediate stream taken from the intermediate stream to a gasoline pool;
- or
- feeding a second portion of the heavy stream to a the gasoline pool.
A process for producing aromatics comprising:
- fractionating a naphtha stream to provide a C7 stream and a C8+ aromatics stream;
- feeding a first C7 stream taken from the C7 stream to an aromatics complex comprising an aromatics extraction unit, a BTX fractionation zone, a xylene fractionation zone, and a transalkylation unit and/or an isomerization unit;
- feeding a second C7 stream taken from the C7 stream to a gasoline pool;
- feeding a first C8+ aromatics stream taken from the C8+ aromatics stream to the aromatics complex;
- and
- feeding a second C8+ aromatics stream taken from the C8+ aromatics stream to the gasoline pool.
Dependencies are inferred from the claim text.