Method for combined production of paraxylene and benzene...

Details Method for combined production of paraxylene and benzene... Method for combined production of paraxylene and benzene...

2006-03-14

2011-10-04

Nguyen, Tam M (Department: 1772)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By alkyl or aryl transfer between molecules, e.g.,...

C585S820000, C585S828000, C585S812000, C585S814000

Reexamination Certificate

active

08030533

ABSTRACT:
A process for the combined production of para-xylene and benzene comprises:separating a first feed, by adsorption in a simulated moving bed SMB, to produce an extract E rich in para-xylene and at least one raffinate R which is depleted in para-xylene;converting a secondary feed of toluene by selective disproportionation to produce benzene and xylenes;a) at the start of the cycle, producing a supplemental quantity of para-xylene in a crystallization unit supplied with the xylenes from the disproportionation;b) at the end of the cycle, when the adsorbant has aged:dividing the distilled extract E into a first fraction Ea and a complementary second fraction Eb;replacing the feed to the initial crystallization by the stream Ea;and recycling the xylenes from the disproportionation to the SMB.The invention enables para-xylene and benzene production to be maintained despite ageing of the SMB absorbent.

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