92.
    发明专利
    未知

    公开(公告)号:ID24269A

    公开(公告)日:2000-07-13

    申请号:ID20000269

    申请日:1998-07-25

    Applicant: BASF AG

    Abstract: In a process for preparing polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers having a low color number by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer over a heterogeneous catalyst, the polymerization is carried out in the presence of hydrogen.

    Process for producing n-substituted 3-hydroxypyrazoles

    公开(公告)号:AU704553B2

    公开(公告)日:1999-04-29

    申请号:AU6517396

    申请日:1996-07-02

    Applicant: BASF AG

    Abstract: PCT No. PCT/EP96/02891 Sec. 371 Date Jan. 8, 1998 Sec. 102(e) Date Jan. 8, 1998 PCT Filed Jul. 2, 1996 PCT Pub. No. WO97/03969 PCT Pub. Date Feb. 6, 1997N-substituted 3-hydroxypyrazoles of the formula I where R1 is unsubstituted or substituted alkyl, aryl or heteroaryl and R2, R3 is hydrogen, cyano, halogen or unsubstituted or substituted alkyl, aryl or heteroaryl, are prepared by oxidation of a corresponding pyrazolidin-3-one with atmospheric oxygen in the presence of a metal salt in an essentially pH-neutral medium.

    METHOD FOR DECOLOURING TETRAHYDROFURAN POLYMERS OR COPOLYMERS

    公开(公告)号:CA2286319A1

    公开(公告)日:1998-10-22

    申请号:CA2286319

    申请日:1998-04-02

    Applicant: BASF AG

    Abstract: The invention relates to a method for decoloring polymers or copolymers obtained by cationic polymerisation of tetrahydrofuran or tetrahydrofuran and alkylene oxide, optionally in the presence of a telogen, wherein a) the low boiling parts are initially separated by vacuum distillation or extraction and b) the remaining polymer or copolymer is heated to a temperature of 20-150 ~C in the presence of at least one auxiliary agent selected from solid oxides and/or phyllosilicates.

    100.
    发明专利
    未知

    公开(公告)号:DE59503191D1

    公开(公告)日:1998-09-17

    申请号:DE59503191

    申请日:1995-09-21

    Applicant: BASF AG

    Abstract: PCT No. PCT/EP95/03651 Sec. 371 Date Mar. 10, 1997 Sec. 102(e) Date Mar. 10, 1997 PCT Filed Sep. 21, 1995 PCT Pub. No. WO96/09335 PCT Pub. Date Mar. 28, 1996A process for the preparation of polytetrahydrofuran or polytetrahydrofuran monoesters of C1-C10 monocarboxylic acids by the polymerization of tetrahydrofuran over a heterogeneous catalyst in the presence of one of the telogens water, 1,4-butanediol or polytetrahydrofuran having a molecular weight of from 200 to 700 dalton or a C1-C10 monocarboxylic acid or mixtures of these telogens, wherein a supported catalyst is used as catalyst, which contains a catalytically active amount of an oxygen-containing tungsten or molybdenum compound or mixtures of these compounds on an oxidic support material and which was calcined at temperatures ranging from 500 DEG to 1000 DEG C. following the application of the precursor compounds of said oxygen-containing molybdenum and/or tungsten compounds to the support material precursor.

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