CHLORINATION OF BENZENE OR MONO-SUBSTITUTED BENZENE

摘要

PURPOSE:To suppress formation of polychlorine addition product by introducing at least past of chlorine gas into a reaction tank in lower stage of a liquid outside circulating gas lift type reactor when the title compound is chlorinated in a liquid phase in the presence of a zeolite catalyst by a chlorine gas. CONSTITUTION:When benzene or mono-substituted benzene is continuously chlorinated in a liquid phase by a chlorine gas in the presence of a zeolite catalyst, reaction liquid is readily removed by obtaining large coefficient of overall conduction and large flow amount of circulation liquid using a liquid outside circulating gas lift type reactor equipped with a raising tube 1 and/or descending tube 4 and cooling means 5 and simultaneously a reaction tank 2 in lower stage and reaction tank 3 in upper stage are each provided in the lower and upper parts of the raising tube 1 and chlorine gas is fed to the former 2 or the both 2 and 3 to stably provide the benzene derivative chlorinated at para position and suppressed in production of polychlorine addition product and polychlorine substitution product which are by-products for a long period. Furthermore, reaction liquid drawn out from the reactor is separated from a catalyst by a solid-liquid separator 6 and then sent to a purification process and the catalyst is returned to the reactor.