| 摘要 |
<p>Process for the manufacture of 1,2-dichloroethane starting from a stream of ethane according to which: a) the stream of ethane is subjected to a cata lytic oxydehydrogenation producing a gas mixture containing ethylene, unconv erted ethane, water and secondary constituents; b) said gas mixture is optio nally washed and dried thus producing a dry gas mixture; c) after an optiona l addit io nal purification step, the dry gas mixture is then conveyed to a chlorination reactor supplied with a flow of chlorine so that at least 10% o f the ethylene is converted to 1,2-dichloroethane; d) the 1,2-dichloroethane formed in the chlorination reactor is optionally isolated from the stream o f products derived from the chlorination reactor; e) the stream of products derived from the chlorination reactor, from which the 1,2-dichloroethane has optionally been extracted, is conveyed to an oxychlorination reactor in whi ch the majority of the balance of ethylene is converted to 1,2-dichloroethan e, after optionally having subjected the latter to an absorption/desorption step e'), during which the 1,2-dichloroethane formed in the chlorination rea ctor is optionally extracted if it has not previously been extracted; f) the 1,2-dichloroethane formed in the oxychlorination reactor is isolated from t he stream of products derived from the oxychlorination reactor and is option ally added to the 1,2-dichloroethane formed in the chlorination reactor; g) the stream of products derived from the oxychlorination reactor, from which the 1,2-dichloroethane has been extracted, optionally containing an addition al stream of ethane previously introduced in one of steps b) to f), is optio nally recycled to step a) after having been optionally purged of gases and/o r after an optional addit ional treatment in order to eliminate the chlorina ted products contained therein.</p> |
