Method for on-stream low-pressure regeneration of an oligomerization catalyst from a fluid-bed reactor operating at high pressure with hydrocarbons in a non-liquid phase

Abstract From the Canadian patent

A process is disclosed for stripping and regenerating a zeolite catalyst at relatively low pressure compared to that of an oligomerization reactor operated with a turbulent fluid-bed at above 515 kPa (60 psig). The reactor operates either with hydrocarbons in the gas phase, or, under near-critical or super-critical conditions when they are in the super-dense phase. The super-dense phase exists outside a critical region in the phase envelope of the hydrocarbon mixture in the reactor, under conditions at which a liquid phase may not form (hence "non-liquid"). Whether the fluid-bed reactor is operated in the C5-C10 gasoline producing mode the C+10, distillate mode, or, the C+22 lubes mode …