PROCESS FOR THE CONTINUOUS PREPARATION OF MONO-OR DI-(TRICHLOROMETHYL)-BENZENES

• Main Authors: LENZMANN, HEINRICH, LADEMANN, RUDOLF, LANDAUER, FRANZ, SCHWIERSCH, WOLFRAM, SCHMIEDEL, KLAUS
• Format: Patent
• Language: English; French
• Published: 27.11.1979
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

Continuous preparation of mono- or di-(trichloromethy)-benzenes or of mono- or di-(trichloromethyl)-benzenes substituted in the benzene ring by halogen a?oms from the corresponding mono- or dimethylbenzenes and chlorine in several steps with radiation by means of rays of high energy, by reacting mono- or dimethylbenzene with chlorine in 4 to 14 steps, at a temperature in the range of from 20 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 the 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. The mono- and di-(trichloromethyl)-benzenes are valuable intermediates for the preparation of pesticides, textile auxiliaries and dyestuffs.