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US 4,069,268 AGranted
Regeneration of metal halide catalysts via halogenation
AssigneeExxon Research & Engineering Co.
InventorsMichael Siskin, Ronald J. Gillespie
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AssigneeExxon Research & Engineering Co.
InventorsMichael Siskin, Ronald J. Gillespie
Estimating the term…
Deactivated or partially deactivated hydrocarbon conversion catalysts comprising (a) one or more Lewis acids of the formula MX.sub.n where M is a component selected from Group IIIA, IVB, V, VIB or VIII Elements of the Periodic Table or their mixtures, X is a halogen, and n is the atomic ratio of halogen to M and varies from 1 to 8, and (b) a strong Bronsted acid, may be regenerated by contacting said catalysts with a halogen selected from the group consisting of fluorine or chlorine. If a portion of the catalyst has been hydrolyzed, the catalyst may be regenerated via halogenation as above or by contact with a hydrogen halide selected from the group consisting of hydrogen fluoride or hydrogen chloride and then fluorine. The preferred Lewis acid is a metal halide, preferably tantalum pentafluoride, niobium pentafluoride or mixtures thereof. The preferred Bronsted acid is a hydrogen halide, preferably hydrogen fluoride.
In a hydrocarbon conversion process which comprises contacting a hydrocabon feedstock with a substantially liquid phase catalyst comprising a metal fluoride selected from the group consisting of tantalum pentafluoride, niobium pentafluoride and mixtures thereof in combination with hydrogen fluoride, thereby forming a hydrocarbon phase and a catalyst phase, at least a portion of said catalyst phase having become deactivated due to the presence of organic contaminants and inorganic separating at least a portion of said catalyst phase from said hydrocarbon phase, the improvement which comprises regenerating at least a portion of said catalyst phase in a regeneration zone by contact therein with a halogen selected from the group consisting of fluorine or chlorine at a temperature between about -30.degree. and about 1000.degree. C. for a period of time sufficient to obtain a catalyst possessing a greater activity for hydrocarbon conversion than that possessed by the deactivated catalyst, at least a portion of said contaminants being converted to halogenated or partially halogenated hydrocarbons and volatilized during said regeneration.
In a hydrocarbon conversion process which comprises contacting a hydrocarbon feedstock with a substantially liquid phase catalyst comprising a metal fluoride selected from the group consisting of tantalum pentafluoride, niobium pentafluoride and mixtures thereof in combination with hydrogen fluoride, thereby forming a hydrocarbon phase and a catalyst phase, at least a portion of said catalyst phase having become deactivated due to the presence of organic contaminants and inorganic contaminants separating at least a portion of said catalyst phase from said hydrocarbon phase, the improvement which comprises regenerating at least a portion of said catalyst phase in a regeneration zone by contact therein with fluorine at a temperature in the range of from about -30.degree. to about 1000.degree. C for a period of time sufficient to obtain a catalyst possessing a greater activity for hydrocarbon conversion than that possessed by the deactivated catalyst, at least a portion of said contaminants being converted to halogenated or partially halogenated hydrocarbons and volatilized during said regeneration.
Dependencies are inferred from the claim text.