Atochem

Societe Atochem

Rhone-progil

Jean Lesparre

Yves Correia

Alain Petit

Gilles Drivon

Sylvain Perdrieux

Annick Faure

Michel Bergougnan

Roger Chevrel

Claude Demaiziere

Murielle Rabiller-Baudry

Marcel Sergent

A thermal process for cracking 1,2-dichloroethane to form vinyl chloride comprising heating 1,2-dichloroethane in a reaction zone at a temperature between 300.degree. and 650.degree. C. under an absolute pressure between 1 and 40 bars; said heating being conducted in the presence of hydrochloric acid.

Continuous process for cracking 1,2-dichloroethane

This invention relates to a process for the purification of 1,1-dichloro-1-fluorethane. To remove unsaturated impurities such as 1,1-dichloroethylene and dichloracetylene the crude 1,1-dichloro-1-fluoroethane is subjected to the action of chlorine and/or of a hydracid. This treatment is carried out in the presence of a Lewis acid, or, only in the case of chlorine, by photochemical catalysis.

Purification of 1,1-dichloro-1-fluoroethane

Hydrocarbons are oxychlorinated by reaction with gaseous HCl and an oxygen-containing gas, in the presence of a catalytically effective amount of a ternary copper/molybdenum chalcogenide having the formula:

Ternary molybdenum chalcogenide oxychlorination catalysts

Chlorinated hydrocarbons, e.g., 1,2-dichloroethane, are prepared by heterogeneously oxychlorinating a hydrocarbon with an oxygen-containing gas and gaseous hydrochloric acid in a fluidized bed containing admixture of (i) a catalytically effective amount of an oxychlorination catalyst, (ii) diluent particles of at least one catalytically and chemically inert solid material, and (iii) copper powder or a powdered copper compound.

Oxychlorination of hydrocarbons

Chlorinated hydrocarbons, e.g., 1,2-dichloroethane, are prepared by heterogenously oxychlorinating a hydrocarbon with an oxygen-containing gas and gaseous hydrochloric acid in a fluidized bed containing admixture of (i) a catalytically effective amount of an oxychlorination catalyst, (ii) diluent particles of at least one catalytically and chemically inert solid material, and (iii) copper powder or a powdered copper compound.

The subject of the invention is functional chlorofluoro compounds of general formula: ##STR1## in which R.sub.F denotes a perfluoroalkyl radical, n is equal to 0 or 1, X denotes a chlorine or fluorine atom or a trichloromethyl or trifluoromethyl radical, and Y denotes a chlorine atom, an optionally salified or esterified hydroxyl group or an optionally substituted amino group, the arrangement R.sub.F --CCl.sub.2 --(CCl.sub.2 --O).sub.n containing at least 3 carbon atoms. By photochlorination of the esters R.sub.F --CH.sub.2 CH.sub.2 --O--CO--X, the compounds I (n=1) are obtained, which are then rearranged to acid chlorides I (n=0, Y.dbd.Cl) from which the corresponding acids, salts, esters and amides are optionally formed (formula I with n=0 and Y=optionally salified or esterified hydroxyl or optionally substituted amino).

Functional chlorofluoro compounds and their preparation

The invention concerns a method of purifying hydrogen chloride gas containing small quantities of chlorine. The purifying method comprises passing impure hydrogen chloride over carbon, at a temperature from 30.degree. to 200.degree. C, in the presence of at least one olefin, possibly containing chlorine. The method of the invention applies particularly to the hydrogen chloride obtained from a chloroethane cracking operation initiated by chlorine.

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Volonne, France

Jean Lesparre