Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – From nonhydrocarbon feed
Reexamination Certificate
2004-09-21
2008-07-29
Caldarola, Glenn (Department: 1797)
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
From nonhydrocarbon feed
C585S639000
Reexamination Certificate
active
07405337
ABSTRACT:
The average cycle propylene selectivity of an oxygenate to propylene (OTP) process using one or more fixed or moving beds of a dual-function oxygenate conversion catalyst with recycle of one or more C4+ olefin-rich fractions is substantially enhanced by the use of selective hydrotreating technology on these C4+ olefin-rich recycle streams to substantially eliminate detrimental coke precursors such as dienes and acetylenic hydrocarbons. This hydrotreating step helps hold the build-up of detrimental coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling a substantial improvement in propylene average cycle yield. The propylene average cycle yield improvement enabled by the present invention over that achieved by the prior art using the same or a similar catalyst system but without the use of the hydrotreating step on the C4+ olefin-rich recycle stream is of the order of about 1.5 to 5.5 wt-% or more.
REFERENCES:
patent: 4061724 (1977-12-01), Grose et al.
patent: 4073865 (1978-02-01), Flanigen et al.
patent: 4310440 (1982-01-01), Wilson et al.
patent: 4387263 (1983-06-01), Vogt et al.
patent: 4433188 (1984-02-01), Hoelderich et al.
patent: 4440871 (1984-04-01), Lok et al.
patent: 4527001 (1985-07-01), Kaiser
patent: 4554143 (1985-11-01), Messina et al.
patent: 4579999 (1986-04-01), Gould et al.
patent: 4587373 (1986-05-01), Hsia
patent: 4677243 (1987-06-01), Kaiser
patent: 4752651 (1988-06-01), Kaiser
patent: 4793984 (1988-12-01), Lok et al.
patent: 4853197 (1989-08-01), Wilson et al.
patent: 4873390 (1989-10-01), Lewis et al.
patent: 5095163 (1992-03-01), Barger
patent: 5126308 (1992-06-01), Barger et al.
patent: 5157181 (1992-10-01), Stine et al.
patent: 5191141 (1993-03-01), Barger et al.
patent: 6121504 (2000-09-01), Kuechler et al.
patent: 6437208 (2002-08-01), Kuechler et al.
patent: 6455749 (2002-09-01), Vaughn
patent: 2003/0139635 (2003-07-01), Hack et al.
patent: 2004/0192982 (2004-09-01), Kuechler et al.
patent: 0 448 000 (1994-05-01), None
patent: 2 171 718 (1986-09-01), None
Rothaemal et al., “Demonstrating the New Methanol to Propylene (MTP) Process”, Mar. 2003, ERTC Petrochemical Conference, Paris, France.
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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