公开(公告)号：CA1067101A

公开(公告)日：1979-11-27

申请号：CA256028

申请日：1976-06-30

Applicant: HOECHST AG

Inventor： LADEMANN RUDOLF ,  LANDAUER FRANZ ,  LENZMANN HEINRICH ,  SCHMIEDEL KLAUS ,  SCHWIERSCH WOLFRAM

IPC: B01J19/12 ,  C07C17/00 ,  C07C17/14 ,  C07C22/04 ,  C07C22/06 ,  C07C25/02 ,  C07C67/00 ,  C07C25/14

Abstract: 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.

公开(公告)号：CA665310A

公开(公告)日：1963-06-18

申请号：CA665310D

Applicant: HOECHST AG

Inventor： GERSTENBERG HELMUT ,  MEDEM HEINZ ,  GRUNEWALD KARL H ,  LADEMANN RUDOLF

公开(公告)号：CA1029746A

公开(公告)日：1978-04-18

申请号：CA212767

申请日：1974-10-31

Applicant: HOECHST AG

Inventor： LADEMANN RUDOLF ,  LINDNER HELMUT ,  MARTINI THOMAS ,  RAMMELT PETER P

IPC: C07C17/00 ,  C07C17/20 ,  C07C22/08 ,  C07C51/62 ,  C07C63/70 ,  C07C67/00 ,  G03F7/038 ,  C07C25/14

Abstract: Preparation of derivatives of benzene containing CF3 groups from the corresponding compounds containing CCl3 groups (e.g. trichloromethyl benzene) is carried out continuously with excellent yield rates by reaction with liquid hydrogen fluoride in an autoclave above 80 DEG C, (which latter exceeds the stoichiometric proportion by at least 25 mole %). The reactants are fed continuously into the autoclave. The reaction mixture preferably becomes pressurized to at least 20 atmospheres and homogeneous after having reached a certain filling level. The reaction mixture is thereafter withdrawn proportionally to its feeding-in rate. The mixture may be conveyed through one or several additional autoclaves with the final withdrawal of the reaction mixture being out from the terminal autoclave of this cascade. The fluorination products are well known starting and inermediate products for the preparation of dyestuffs and pesticidal compositions.

公开(公告)号：CA1014974A

公开(公告)日：1977-08-02

申请号：CA197655

申请日：1974-04-17

Applicant: HOECHST AG

Inventor： LADEMANN RUDOLF ,  LANDAUER FRANZ

IPC: C07C211/52 ,  C07C20060101 ,  C07C67/00 ,  C07C209/00