Title:
PROCESSING C4 OLEFIN STREAMS FOR THE MAXIMUM PRODUCTION OF PROPYLENE
Document Type and Number:
WIPO Patent Application WO2005009929
Kind Code:
B1
Abstract:
In order to maximize the production of propylene when the external supply of ethylene is limited, the C4 cut from a hydrocarbon cracking process is first subjected to autometathesis prior to any isobutylene removal and without any ethylene addition. This favors the reactions which produce propylene and pentenes. The ethylene and propylene produced are then removed leaving a stream of the C4's and heavier components. The C5 and heavier components are then removed leaving a mixture of 1-butene, 2-butene, isobutylene, and iso-and normal butanes. The isobutylene is next removed preferably by a catalytic distillation hydroisomerization de-isobutyleneizer. The isobutylene-free C4 stream is then mixed with the product ethylene removed from the autometathesis product together with any fresh external ethylene needed and subjected to conventional metathesis producing additional propylene.
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Inventors:
GARTSIDE ROBERT J
GREENE MARVIN I
GREENE MARVIN I
Application Number:
PCT/US2004/022118
Publication Date:
May 12, 2005
Filing Date:
July 12, 2004
Export Citation:
Assignee:
ABB LUMMUS GLOBAL INC (US)
International Classes:
C07C6/04; C07C11/06; (IPC1-7): C07C6/04; C07C11/06
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