Process for the dehydrogenation of hydrocarbons

Patent · Tue Jul 13 04:00:00 EDT 1993

OSTI ID:6165128

Cottrell, P R; Fettis, M E

In a process for the dehydrogenation of a hydrocarbon selected from the group consisting of propane and butane in the presence of a catalyst is described comprising platinum and a carrier material wherein said dehydrogenation is conducted at severe operating conditions which promote rapid deactivation of said catalyst including the agglomeration of said platinum on said carrier material and the deposition of coke on said catalyst, the improvement which comprises the steps of contacting said catalyst comprising platinum and a carrier material having coke deposited thereon with an oxygen containing gas to remove said coke by combustion; contacting said catalyst having coke removed therefrom with a drying gas having a temperature in a range of from about 800 F (426 C) to about 1,100 F (593 C) and an oxygen concentration from about 21 to about 39 mole percent until said catalyst has a water concentration of less than about 1 weight percent; contacting said catalyst comprising platinum and a carrier material having a water concentration of less than about 1 weight percent with a redispersion gas comprising chlorine and having an oxygen concentration from about 21 to about 39 mole percent to redisperse platinum on said catalyst; contacting the resulting catalyst having redispersed platinum in a reduction zone with a hydrogen-rich gas at a temperature from about 700 F (371 C) to about 1,100 F (593 C) and a pressure from about 5 psig (34.5 kPa gauge) to about 125 psig (862 kPa gauge); and recovering reconditioned catalyst from said reduction zone.

• Assignee: UOP, Des Plaines, IL (United States)
• Patent Number(s): A; US 5227566
• Application Number: PPN: US 7-779746
• OSTI ID: 6165128
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300* -- Natural Gas-- Drilling
Production
& Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AGGLOMERATION
ALKANES
BUTANE
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHLORINE
COKE
COMBUSTION
DEACTIVATION
DEHYDROGENATION
DEPOSITION
DRYING
ELEMENTS
HALOGENS
HYDROCARBONS
HYDROGEN
METALS
MOISTURE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
PLATINUM
PLATINUM METALS
PROPANE
REDUCTION
REGENERATION
REMOVAL
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS