US 5,847,242 A · Catalysts for halogenated hydrocarbon processing, their precursors and their preparation and use

Abstract

A process is disclosed for changing the fluorine content of halogenated hydrocarbons containing from 1 to 6 carbon atoms, in the presence of a multiphase catalyst, which is characterized by preparing certain single phase solid catalyst precursors containing two metal components (e.g., a divalent component of Mn, Co, Zn, Mg and/or Cd and a trivalent component of Al, Ga, Cr and/or V) which have structures that collapse at about 600.degree. C. or less; and producing said catalyst by heating the precursor to produce a multiphase composition wherein a phase containing one of the metal components is homogeneously dispersed with a phase containing the other metal component, and at least when the precursor contains no fluoride, contacting said multiphase composition with a vaporizable fluorine-containing fluorination compound at a temperature of from about 200.degree. C. to 450.degree. C. Also disclosed are single phase fluoride compositions having the formula MM'F.sub.5 (H.sub.2 O).sub.2 wherein M is a divalent component selected from Mn, Co, Zn, Mg and/or Cd and M' is a trivalent component selected from Al, Ga, Cr and/or V (provided that Cr is not more than about 10 atom percent of M'); preparation of certain homogeneously dispersed multiphase catalyst compositions containing fluorides of those divalent and trivalent metal components; and certain homogeneously dispersed multiphase catalyst compositions containing fluorides of those divalent and trivalent metal components (provided that when Co is used another of said divalent elements is also used).

Claims15

Dependent claims

A process for changing the fluorine content of a halogenated hydrocarbon containing from 1 to 6 carbon atoms in the presence of a multiphase catalyst, characterized by:

preparing a single phase solid catalyst precursor which has a structure that collapses at a temperature of about 600.degree. C. or less and has the formula E.sub.u E'.sub.1-u Z.sub.v (H.sub.2 O).sub.w Y.sub.z wherein E is at least one element selected from the group consisting of Group I through Group VIII metals of the Periodic Table, E' is at least one element other than the elements of E selected from the group consisting of Group I through Group VIII metals of the Periodic Table, Z is at least one anion selected from fluoride, chloride, bromide, oxide, and oxygen-containing groups which decompose at about 600.degree. C. or less, Y is a cation which decomposes at about 600.degree. C., or less, u is from 0.001 to 0.999, w is from 0 to about 20, z is from 0 to about 5, and v is selected to essentially balance the charge of said precursor;
and
producing said catalyst by heating said single phase solid catalyst precursor to about 600.degree. C. or less to produce a multiphase composition wherein a phase containing E is homogeneously dispersed with a phase containing E', and at least when said precursor contains no fluoride, contacting said multiphase composition with a vaporizable fluorine-containing fluorinating compound at a temperature of from about 200.degree. C. to 450.degree. C.

Dependencies are inferred from the claim text.

Catalysts for halogenated hydrocarbon processing, their precursors and their preparation and use

Life of this patent

Catalysts for halogenated hydrocarbon processing, their precursors and their preparation and use

Life of this patent

Abstract

Claims15