Xylene production processes with integrated feedstock treatment
AssigneeUop LLC
InventorsAntoine Negiz, Edwin P. Boldingh, James E. Rekoske, Eric J. Baker
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Abstract
A process for aromatic transalkylation and olefin reduction of a feed stream is disclosed. Transalkylation conditions provide a product having increased xylene concentration and reduced olefin concentration relative to the feed. The process may be used in a xylene production facility to minimize or avoid the necessity of feedstock pretreatment such as hydrotreating, hydrogenation, or treating with clay and/or molecular sieves.
Claims19
A process for producing xylene and removing olefins from a feed stream comprising benzene and at least one of an alkyl aromatic compound and an alkyl naphthenic compound, the feed stream having an olefin content as determined by a Bromine Index of at least about 50, said process comprising:
- contacting the feed stream with a transalkylation catalyst comprising an acidic molecular sieve and at least one metal component having hydrogenation functionality at transalkylation conditions to provide a transalkylation product having an increased concentration of xylene and a reduced olefin content as determined by a Bromine Index at least 60% lower than the Bromine Index of the feed stream.
A process for producing xylene and removing olefins from a feedstock comprising C8 aromatics the feedstock having an olefin content as determined by a Bromine Index of at least about 100, said process comprising:
- (a) mixing said feedstock and a stream comprising C9+ aromatics, to provide a mixture, said mixture having a Bromine Index of at least about 50 and an End Boiling Point of at least about 210° C.;
- and
- (b) contacting the mixture with a transalkylation catalyst comprising an acidic molecular sieve and at least one metal component having hydrogenation functionality at transalkylation conditions to provide a transalkylation product having an increased concentration of xylenes and a reduced olefin content as determined by a Bromine Index at least 60% lower than the Bromine Index of the mixture.
Dependencies are inferred from the claim text.