22.
    发明专利
    未知

    公开(公告)号:BR8004478A

    公开(公告)日:1981-01-27

    申请号:BR8004478

    申请日:1980-07-18

    Applicant: HOECHST AG

    Abstract: Mixtures of optical brighteners consisting of 5 to 95 parts by weight of a mixture consisting of 0 to 80% by weight of the compound of the formula 1 (1) 20 to 100% by weight of the compound of the formula 2 (2) and 0 to 80% by weight of the compound of the formula 3 (3) and 95 to 5% by weight of one or more other optical brighteners.

    25.
    发明专利
    未知

    公开(公告)号:BR7409400A

    公开(公告)日:1976-05-18

    申请号:BR940074

    申请日:1974-11-08

    Applicant: HOECHST AG

    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 The reaction mixture is thereafter withdrawn proportionally to its feeding-in rate.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.

Patent Agency Ranking