Patent ID: 8119745
Filing Date: 2012-02-21
Classification: C07C,C08F,Y02P

Abstract:
1. A process for the manufacture of 1,2-dichloroethane starting from a stream of ethane, comprising: a) subjecting the stream of ethane to a catalytic oxydehydrogenation thus producing a gas mixture containing ethylene, unconverted ethane, water and secondary constituents; b) drying said gas mixture thus producing a dry gas mixture, wherein said gas mixture is optionally washed before or after said drying; c) after an optional additional purification step, subjecting said dry gas mixture comprising the stream of products derived from the chlorination reactor R d) conveying said fraction A to a chlorination reactor R e) subjecting said fraction F f) subjecting said fraction F g) conveying said fraction B to an oxychlorination reactor in which most of the ethylene present in said fraction B is converted into 1,2-dichloroethane, wherein the 1,2-dichloroethane so obtained is separated from the stream of products derived from the oxychlorination reactor and is optionally added to the 1,2-dichloroethane formed in the chlorination reactor R h) optionally, recycling to step a) the stream of products derived from the oxychlorination reactor, from which the 1,2-dichloroethane has been extracted, optionally containing an additional stream of ethane previously introduced in one of steps b) to g), after having been optionally purged of gases and/or after an optional treatment in order to eliminate the chlorinated products contained therein.