Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – From nonhydrocarbon feed
Reexamination Certificate
2008-05-13
2008-05-13
Caldarola, Glenn (Department: 1797)
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
From nonhydrocarbon feed
C585S638000, C585S324000, C585S634000
Reexamination Certificate
active
07371916
ABSTRACT:
The average propylene selectivity per on-stream cycle of an alcoholic oxygenate to propylene (OTP) process using one or more fixed beds of a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a feed pretreatment step involving a catalytic etherification reaction, by switching to moving bed reactor technology in the olefin synthesis portion of the OTP flow scheme in lieu of fixed bed technology and by the selection of a catalyst on-stream cycle time of 300 hours or less. These provisions hold the build-up of coke deposits on the dual-function catalyst to a level which does not substantially degrade catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of propylene average cycle yield at essentially start-of-cycle levels. The propylene average cycle yield improvement enabled by the present invention over that achieved by the fixed bed system of the prior art using the same or a similar dual-function catalyst system is of the order of about 1.5 to 5.5 wt-% or more.
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Paper “Insights into Gas to Propylene, GTP®/MTP® Technology” by Dr. Waldemar Liebner, Lurgi AG, Frankfurt am Main; Germany, presented at Propylene Trade & Derivatives Markets, Singapore, Oct. 24-25, 2005.
Glover Bryan K.
Kalnes Tom N.
Wei Daniel H.
Bullock In Suk
Caldarola Glenn
Goldberg Mark
UOP LLC
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