The present invention provides a composition comprising an HFO compound, the composition having excellent stability with decomposition and oxidation of the HFO compound being inhibited, the composition having improved refrigerating capacity when used as a heat transfer medium, compared with the case in which an HFO compound is used alone. More specifically, the present invention provides a composition comprising at least one HFO compound selected from the group consisting of HFO-1234yf, (E-/Z-)HFO-1234ze, and (E-/Z-)HFO-1225ye; and a chlorine-containing compound, wherein (1) the chlorine-containing compound is at least one member selected from the group consisting of CH.sub.2CHCl, CHFCHCl, CH.sub.2CFCl, CF.sub.3Cl, CH.sub.3Cl, CF.sub.3CH.sub.2Cl, CClFCHCl, and CHFCCl.sub.2, and (2) the chlorine-containing compound is contained in an amount ranging from 1 to 500000 mass ppm.

A process for the production of vinyl chloride comprises the step of passing a feed stream comprising ethylene dichloride (EDC) over a catalyst system comprising a dehydrochlorination catalyst and a hydrochlorination catalyst at a temperature, which may be in the range 150-350 C., sufficient to effect dehydrochlorination of the ethylene dichloride to produce vinyl chloride.

A process for the production of vinyl chloride comprises the step of passing a feed stream comprising ethylene dichloride (EDC) over a catalyst system comprising a dehydrochlorination catalyst and a hydrochlorination catalyst at a temperature, which may be in the range 150-350 C., sufficient to effect dehydrochlorination of the ethylene dichloride to produce vinyl chloride.

A composition is disclosed that comprises 3,3,3-trifluoropropene (1243zf), 1,1,1-trifluoropropane (263fb), vinyl chloride monomer (CH.sub.2?CHCl), and at least one of 1,1,1-trifluoroethane (143a), dichlorodifluoromethane (12), 1-chloro-1-fluoroethylene (1131a), 1-chloro-2-fluoroethylene (1131), 1,1-difluoroethane (152a), 1-chloro-2-fluoroethane (151), 1-chloro-1-fluoroethane (151a), 3-chloro-1,1,1-trifluoropropane (253fb), 1,1,1,2-tetrafluoropropane (254eb), 1,3,3,3,-tetrafluoropropane (254fb), 1,1,1,2-tetrafluoroethane (134a), 1,1,2,2,2-pentafluoropropene (1225zc), 1,3,3,3-tetrafluoropropene (1234ze), 3-chloro-3,3,-difluoropropene (1242zf), dichlorofluoropropene (1241), 1,1,3-trichloropropene (1240za), 1,1,1,3-tetrachloropropane (250fb), tetrachloroethylene (1110), chloromethane (40), 2-chloro-3,3,3-trifluoropropene (1233xf), 1-chloro-3,3,3-trifluoro-1-propene (1233zd), chlorodifluoropropene (1242), 2-chloro-1,1,1-trifluoropropane (253db), 1,2-dichloro-3,3,3-trifluoropropene (1223xd), dichlorodifluoropropene (1232), 1,1-dichloroethylene (1130a), 2,3-dichloro-1,1,1-trifluoropropane (243db), and pentachlorofluoroethane (111).

A composition is disclosed that comprises 3,3,3-trifluoropropene (1243zf), 1,1,1-trifluoropropane (263fb), vinyl chloride monomer (CH.sub.2?CHCl), and at least one of 1,1,1-trifluoroethane (143a), dichlorodifluoromethane (12), 1-chloro-1-fluoroethylene (1131a), 1-chloro-2-fluoroethylene (1131), 1,1-difluoroethane (152a), 1-chloro-2-fluoroethane (151), 1-chloro-1-fluoroethane (151a), 3-chloro-1,1,1-trifluoropropane (253fb), 1,1,1,2-tetrafluoropropane (254eb), 1,3,3,3,-tetrafluoropropane (254fb), 1,1,1,2-tetrafluoroethane (134a), 1,1,2,2,2-pentafluoropropene (1225zc), 1,3,3,3-tetrafluoropropene (1234ze), 3-chloro-3,3,-difluoropropene (1242zf), dichlorofluoropropene (1241), 1,1,3-trichloropropene (1240za), 1,1,1,3-tetrachloropropane (250fb), tetrachloroethylene (1110), chloromethane (40), 2-chloro-3,3,3-trifluoropropene (1233xf), 1-chloro-3,3,3-trifluoro-1-propene (1233zd), chlorodifluoropropene (1242), 2-chloro-1,1,1-trifluoropropane (253db), 1,2-dichloro-3,3,3-trifluoropropene (1223xd), dichlorodifluoropropene (1232), 1,1-dichloroethylene (1130a), 2,3-dichloro-1,1,1-trifluoropropane (243db), and pentachlorofluoroethane (111).

A process for the production of vinyl chloride comprises the step of passing a feed stream comprising ethylene dichloride (EDC) over a catalyst system comprising a dehydrochlorination catalyst and a hydrochlorination catalyst at a temperature, which may be in the range 150-350 C., sufficient to effect dehydrochlorination of the ethylene dichloride to produce vinyl chloride.

A process for the production of vinyl chloride comprises the step of passing a feed stream comprising ethylene dichloride (EDC) over a catalyst system comprising a dehydrochlorination catalyst and a hydrochlorination catalyst at a temperature, which may be in the range 150-350 C., sufficient to effect dehydrochlorination of the ethylene dichloride to produce vinyl chloride.

A catalyst including gold, or a compound thereof, and sulphur, a compound of sulphur, trichloroisocyanuric acid or a metal dichloroisocyanurate on a support, together with a process for manufacturing the catalyst and its use in a chemical process are described.

A catalyst including gold, or a compound thereof, and sulphur, a compound of sulphur, trichloroisocyanuric acid or a metal dichloroisocyanurate on a support, together with a process for manufacturing the catalyst and its use in a chemical process are described.

The present invention relates to improvements in known gold containing catalysts. In particular, the present invention relates to improving the stability and/or inhibition of deactivation of gold containing catalysts via the addition of an inorganic oxide, hydroxide, oxo-salt or oxo-acid. There is also disclosed a method for preparing said catalyst most suitably via an impregnation method. Such catalysts are useful in the production of vinyl chloride monomer.