METHOD FOR PRODUCING OPTICALLY ACTIVE ALCOHOLS OR CARBOXYLICACIDS

    公开(公告)号:CA2553249A1

    公开(公告)日:2005-08-25

    申请号:CA2553249

    申请日:2005-02-08

    Applicant: BASF AG

    Abstract: The invention concerns a method for producing optically active hydroxy-, alkoxy-, amino-, alkyl-, aryl- or chlorine-substituted alcohols or hydroxycarboxylic acids having 3 to 25 carbon atoms or their acid derivative s or cyclization products by hydrogenating the correspondingly substituted optically active monocarboxylic acids or dicarboxylic acids or their acid derivatives in the presence of a catalyst whose active constituent consists of rhenium or contains rhenium and at least one additional element of atomic numbers 22 to 83, with the provisions that: a) the at least one additional element of atomic numbers 22 to 83 is not rhenium, and; b) when producing optically active 2-amino-, 2-chloro-, 2-hydroxy- and 2-alkoxy-1-alkanols by the catalytic hydrogenation of correspondingly optically active 2-amino-, 2- chloro-, 2-hydroxy- and 2-alkoxy carboxylic acids or their acid derivatives, the at least one additional element of atomic numbers 22 to 83 is not palladium nor platinum.

    24.
    发明专利
    未知

    公开(公告)号:DE502005001845D1

    公开(公告)日:2007-12-13

    申请号:DE502005001845

    申请日:2005-07-07

    Applicant: BASF AG

    Abstract: The present invention provides a process for preparing 1,6-hexanediol by hydrogenating dialkyl adipates, alkyl 6-hydroxycaproates, 1,4-cyclohexanedione and 4-hydroxycyclohexan-1-one as ester mixtures comprising impurities, by a) freeing resulting the esterification mixture of excess alcohol and low boilers in a first distillation stage (alcohol removal), b) carrying out a separation of the bottom product in a second distillation stage into an ester fraction substantially free of 1,4-cyclohexanediols and a fraction comprising at least the majority of the 1,4-cyclohexanediols, c) catalytically hydrogenating the ester fraction substantially free of 1,4-cyclohexanediols (ester hydrogenation) and d) in a purifying distillation stage, obtaining 1,6-hexanediol from the hydrogenation effluent in a manner known per se, which comprises selectively hydrogenating the ester mixture before stage a) and/or before stage b) (purifying hydrogenation).

    30.
    发明专利
    未知

    公开(公告)号:AT376987T

    公开(公告)日:2007-11-15

    申请号:AT05759413

    申请日:2005-07-07

    Applicant: BASF AG

    Abstract: The present invention provides a process for preparing 1,6-hexanediol by hydrogenating dialkyl adipates, alkyl 6-hydroxycaproates, 1,4-cyclohexanedione and 4-hydroxycyclohexan-1-one as ester mixtures comprising impurities, by a) freeing resulting the esterification mixture of excess alcohol and low boilers in a first distillation stage (alcohol removal), b) carrying out a separation of the bottom product in a second distillation stage into an ester fraction substantially free of 1,4-cyclohexanediols and a fraction comprising at least the majority of the 1,4-cyclohexanediols, c) catalytically hydrogenating the ester fraction substantially free of 1,4-cyclohexanediols (ester hydrogenation) and d) in a purifying distillation stage, obtaining 1,6-hexanediol from the hydrogenation effluent in a manner known per se, which comprises selectively hydrogenating the ester mixture before stage a) and/or before stage b) (purifying hydrogenation).

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