Hoechst Aktiengesellschaft

Wolfram Schwiersch

Franz Landauer

Rudolf Lademann

Klaus Schmiedel

Heinrich Lenzmann

Continuous preparation of mono- or di-(trichloromethyl)-benzenes or of mono- or di-(trichloromethyl)-benzenes substituted in the benzene ring by halogen atoms from the corresponding mono- or dimethylbenzenes and chlorine in several steps with radiation by means of rays of high energy, is effected by reacting mono- or dimethylbenzene with chlorine in 4 to 14 steps, at a temperature in the range of from 20.degree. to 130.degree. C, whereby chlorine is introduced into the second step and the following steps, the resulting waste gas is introduced into step 1 and chlorine contained in the waste gas is reacted in reactor 1 with fresh mono- and dimethylbenzene. A preferred embodiment for carrying out the process is reaction in a reactor arrangement in cascade form, wherein the number of steps corresponds to the number of reactors and wherein as reactors circulation reactors are used.

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Frankfurt-am-Main, Germany

Wolfram Schwiersch