Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1978-07-10
1979-08-28
Davis, C.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208138, 208139, 208140, 252415, C10G 3508
Patent
active
041660242
ABSTRACT:
A process for reforming naphtha, with hydrogen, in a cyclic reforming unit which contains a plurality of catalyst-containing on-stream reactors in series, and a catalyst-containing swing reactor manifolded therewith which can be periodically placed in series and substituted for an on-stream reactor while the latter is removed from series for regeneration and reactivation of the catalyst contained therein. In the process, the ability of a catalyst to operate in a hydrogenolysis mode and effect sulfur release can be effectively suppressed after the freshly prepared catalyst has been regenerated, and reactivated several times, generally about five times or more, by the addition thereto of sufficient sulfur to maintain an equilibrium amount of sulfur on the catalyst, preferably a maximum of about 0.01 weight percent sulfur. Preferably, a modified catalyst presulfiding regimen is imposed wherein the amount of sulfur added to a fresh catalyst is progressively, and preferably proportionately reduced from one regeneration, reactivation sequence to the next such that, on and after about the fifth regeneration, and reactivation of the catalyst a maximum of about 0.01 weight percent sulfur is added to the catalyst. In a preferred mode of operation, the catalyst of the lead reactors of the series is not directly sulfided, but indirectly sulfided by sulfur added to, and released by the tail reactor, or reactors. An on-stream water wave displaces sulfur from the sulfided catalyst of the tail reactor, or reactors, as it is returned to service, and a water wave from the catalyst of each reactor redistributes sulfur to undersulfided catalysts of other reactors in the form of hydrogen sulfide released to and carried by the recycle gas.
REFERENCES:
patent: 3573199 (1971-03-01), McCoy
patent: 3684692 (1972-08-01), Keith et al.
patent: 3835063 (1974-09-01), Davis et al.
patent: 3875047 (1975-04-01), Dalsom et al.
patent: 4125454 (1978-11-01), Clem et al.
Davis C.
Exxon Research & Engineering Co.
Proctor L. A.
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