method for producing 1,1,2 - trichloräthan from 1.2 - dichloräthan and chlorine

摘要

1458338 Preparation of 1,1,2-trichloroethane SOLVAY & CIE 7 March 1975 [8 March 1974] 9602/75 Heading C2C 1,1,2-Trichloroethane is obtained by reacting liquid 1,2-dichloroethane with chlorine under boiling conditions in one or more consecutive reactors, each having a peroxide supply and a chlorine inlet, in the presence of one or more of the following peroxides: propionyl, isobutyryl, capriloyl, 3,5,5-trimethyl hexanoyl, decanoyl, lauroyl and 2,4-dichlorobenzoyl peroxides, isopropyl and cyclohexyl percarbonates, and t-butyl perpivalate. The reaction is suitably conducted at a temperature of 80-110‹ C. at pressures which are close to atmospheric pressure. From 10SP-4/SP to 2 Î 10SP-2/SP mol of peroxide per litre of reaction mixture may be introduced into the, or each, reactor, and the molar ratio of total chlorine to 1,2- dichloroethane is preferably from 0À1 to 1 : 1 to 1À1 : 1. The reaction is preferably carried out in the presence of less than 10SP-3/SP mol of oxygen per mol of chlorine and less than 15 parts of ferric ions per million parts of 1,2- dichloroethane. The dwell time of the reactants in the (or each) reactor is generally from 1 to 60 minutes at 80‹ C., 0À25 to 40 minutes at 110‹ C., or certain defined values within these two limits. The process may be carried out either batchwise or continuously, suitable flow diagrams being described.