Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By addition of entire unsaturated molecules – e.g.,...
Patent
1989-10-16
1990-05-15
Davis, Curtis R.
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By addition of entire unsaturated molecules, e.g.,...
585533, 585716, 585722, C07C 202
Patent
active
049260030
ABSTRACT:
A high pressure process is disclosed for oligomerizing a lower olefin-containing feed to produce distillate or lubes without having to regenerate spent catalyst. Directly coupling the operation in tandem of a MOG (Mobil Olefin to Gasoline) riser reactor and a fluid bed MODL (Mobil Olefin to Distillate or Lubes) reactor, each containing a medium pore size siliceous metallosilicate crystalline shape selective zeolite catalyst, and each operating so that the effluent from each leaves in the super-dense phase, produces the desired product. The MOG riser operates in the transport regime at sufficiently high severity so as to make a "distillate-rich" gasoline effluent with spent catalyst from the MODL reactor. The MODL reactor operates in the turbulent regime at low severity, with catalyst having a lower coke content than that of riser catalyst, to produce a major portion by wt of either distillate or lubes, depending upon the chosen mode of operation, with excellent per pass conversion of olefins. Substantially no catalyst from the riser goes to the fluid bed, while a minor portion of the inventory of catalyst in the fluid bed is either intermittently or continuously withdrawn as a slipstream. This slipstream may be drawn down into the riser, or discharged to a FCC unit, or both. A gasoline/distillate splitter separates gasoline from distillate and/or lubes made in the MODL reactor. A portion of the gasoline is purged, but the remainder is recycled to the inlet of the MODL reactor to quench the effluent from the MOG riser before it is introduced into the MODL reactor. This control of temperature, and avoiding the use of a regenerator provides an economic process.
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Harandi Mohsen N.
Owen Hartley
Davis Curtis R.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Wise L. G.
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