Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce aromatic
Patent
1998-08-25
1999-11-02
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
To produce aromatic
585313, 585478, 585477, 585481, 585479, C07C 100, C07C 522
Patent
active
059774207
ABSTRACT:
A method for increasing the efficiency of xylene isomerization by using a two stage isomerization process. In the first stage of the process, a C.sub.9.sup.+ aromatics feedstock is subjected to ethylbenzene conversion and xylene isomerization. Non-C.sub.8 aromatics are removed from the effluent, which is then processed in a second stage of the process to remove para-xylene and isomerize the para-xylene depleted effluent. The effluent from the second stage isomerization unit is then recycled into the inlet of the second stage of the process and a slip stream from the para-xylene separator is recycled to the feedstock and to the effluent of the ethylbenzene conversion unit. In this way, the production of para-xylene is maximized. In a preferred embodiment, toluene is co-fed into the feedstock to minimize the loss of xylenes during the ethylbenzene conversion reaction.
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Abichandani Jeevan S.
Beck Jeffrey S.
Brown Stephen H.
Cimini Ronald J.
Johnson Ivy D.
Dang Thuan D.
Griffin Walter D.
Keen Malcolm D.
Mobil Oil Corporation
Roberts Peter W.
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