Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce unsaturate
Reexamination Certificate
2006-11-14
2006-11-14
Dang, Thuan D (Department: 1764)
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
To produce unsaturate
C585S650000, C585S652000, C585S653000
Reexamination Certificate
active
07135602
ABSTRACT:
Provided herein is a method and apparatus for selective deep catalytic cracking of petroleum naphthas or other hydrocarbon feedstocks. The feed comprising the hydrocarbons to be cracked and steam, in well-defined proportions, is first sent into a precatalytic zone (Zone I) of a cracking reactor, preferably a tubular reactor. In a preferred embodiment, Zone I, contains beads of some catalytically mildly active porous material such as quartz or quartz doped with Cr—Al, is set at a temperature T1. The gas steam flows then through a catalyst bed, called Zone II, where the catalytic reaction takes place. Zone II is set at temperature T2and contains a zeolite type catalyst, preferably ZSM5 zeolite or, most preferably, a hybrid zeolite catalyst. It is shown that by moderately increasing the temperature T1of Zone I, it is possible to have an increased total conversion of n-hexane used as model molecule for petroleum naphthas and an increased yield of light olefins (and aromatics), when compared to the parent ZSM-5 zeolite catalyst The ethylene/propylene product ratio is closely dependent of the temperature T1, if all other reaction parameters are kept constant and can be widely varied (from 1.0 to 2.0 for instance) for a limited range of variation of temperature T1.
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Vasil'EVA et al. “The catalytic pyrolysis of hydrocarbons.”Kinetics and Catalysts,vol. 21, No. 1, pp. 175-179, 1980.
Dang Thuan D
Merchant & Gould P.C.
Valorbec Societe en Commandite
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