METHOD OF PRODUCING CHLOROBENZENES FROM BENZENE SULPHOCHLORIDES DEVICE FOR REGULATING THE THICKNESS OF THE COATING

摘要

1424149 Chlorobenzenes VYSKUMNY USTAV AGROCHEMICKEJ TECHNOLOGIE 21 June 1974 [25 June 1973] 27635/74 Heading C2C A method of preparing a chlorobenzene from a benzene sulphochloride by a thermal chlorinating decomposition of an aromatic sulphochloride of general formula wherein X is hydrogen, a halogen, a C 1 to C 4 alkyl or alkoxy group and n is an integer from 1 to 5 comprises carrying out the said decomposition in the presence of a catalyst comprising a combination of active carbon and either a phosphorus halide or an azo compound able to give free radicals when degrading, wherein the active carbon and the phosphorus halide or azo compound are each employed in an amount not greater than 5% by weight relative to the initial amount of benzene sulphochloride. The reaction preferably proceeds at a temperature of from 50‹ to 250‹ C. The ratio of the two catalyst constituents may be from 0À1 : 9À9 to 9À9 : 0À1 by weight.