HYDROCARBON DEHYDROGENATION PROCESS USING A COMBINATION OF ISOTHERMAL AND ADIABATIC DHYDROGENATION STEPS

摘要

"HYDROCARBON DEHYDROGENATION PROCESS USING A COMBINATION OF ISOTHERMAL AND ADIABATIC DEHYDROGENATION STEPS" Deydrogenatable C2-plus feed hydrocarbons are catalytically dehydrogenated by the steps of: (a) passing a feed stream comprising the C2-plus feed hydrocarbon into an isothermal dehydrogenation zone and through at least one bed of dehydrogenation catalyst maintained at isothermal dehydrogenation conditions selected to convert at least about 50 weight percent of the feed stream and to produce an effluent stream comprising hydrogen, unconverted C2-plus feed hydrocarbon and C2-plus product hydrocarbon; (b) admixing an oxygen-containing stream with the isothermal dehydrogenation zone effluent stream; (c) passing the resulting mixture through a bed of hydrogen selective oxidation catalyst maintained at oxidation conditions selected to produce an oxidation zone effluent stream having a reduced concentration of hydrogen and an increased temperature relative to the temperature of the mixture; (d) passing the oxidation zone effluent stream into an adiabatic dehydrogenation zone and through at least one bed of dehydrogenation catalyst maintained at dehydrogenation conditions selected to convert additional unconverted C2-plus feed hydrocarbon and to produce an adiabatic dehydrogenation zone effluent stream comprising hydrogen and C2-plus product hydrocarbon; and (e) recovering the resulting C2-plus product hydrocarbon.