Abstract: Catalytic hydrochlorination system comprising at least one amine hydrochloride and at least one group VIII metal compound chosen from the group composed of mixtures of a platinum (IV) compound with tin (II) chloride, mixtures of a platinum (II) compound with triphenylphosphine oxide and mixtures of a palladium (II) compound with triphenylphosphine. This catalytic system is suitable for preparing vinyl chloride by reaction of acetylene with hydrogen chloride.

Abstract: Liquid catalytic system comprising at least one group VIII metal compound, a fatty amine hydrochloride whose melting point is greater than 25.degree. C. and an organic solvent. This catalytic system is suitable for the preparation of vinyl chloride by reacting acetylene with hydrogen chloride.

Abstract: Catalytic system comprising at least one group VIII metal compound and at least one amine hydrochloride whose melting point is lower than or equal to 25.degree. C. This catalytic system is suitable for the preparation of vinyl chloride by reacting acetylene with hydrogen chloride.

Abstract: The process consists in successively separating increasingly heavy petroleum cuts at the head of a plurality of columns CO1, CO2, CO3 and Cl0 of a first series of columns which feed individually each column of the second series. The column CO7 is a gasoline stabilizing column which feeds an installation for fractionating light petroleum gases. The column CO4 is a gasoline fractionating column. The columns CO5 and CO6 are columns for separating petroleum naphthas from kerosine. The atmospheric residue collected at the bottom of the column Cl0 is processed in the vacuum distillation column Cl2 and the residue from this column is processed in the second vacuum distillation column Cl3 after reheating in a furnace.By carrying out a succession of progressive separations performed in a series of columns of small volume, more efficient utilization of the recovery heat is achieved.

Abstract: A process is provided for purifying vinylidene chloride by removing dichloroacetylene. The vinylidene chloride to be purified is treated with a solution containing at least one compound selected from the group consisting of metal sulfites and metal hyposulfites to form a reaction mixture, and thereafter the purified vinylidene chloride is separated from the reaction mixture.