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    Process for the preparation of polytetrahydrofuran
    4.
    发明专利
    Process for the preparation of polytetrahydrofuran 未知

    公开(公告)号：DE4316137A1

    公开(公告)日：1994-11-17

    申请号：DE4316137

    申请日：1993-05-14

    Applicant: BASF AG

    Inventor： BECKER RAINER DR ,  SIGWART CHRISTOPH DR ,  PALM CHRISTOF DR ,  FRANZISCHKA WOLFGANG DR

    IPC: C08G18/28 ,  C08G18/48 ,  C08G65/20 ,  C08G65/26

    Abstract: A process for the preparation of polytetrahydrofuran or polytetrahydrofuran monoesters with C1- to C20-monocarboxylic acids or polytetrahydrofuran monoethers with monohydric C1- to C20-alcohols having a mean molecular weight of from 250 to 15,000 daltons by cationic polymerisation of tetrahydrofuran in the presence of a telogen, characterised in that tetrahydrofuran is polymerised in the presence of water, 1,4-butanediol and/or polytetrahydrofuran having a mean molecular weight of from 200 to 700 daltons and/or in the presence of a C1- to C20-monocarboxylic acid and/or a monohydric C1- to C20-alcohol with the aid of a catalytically effective amount of a bleaching earth catalyst.

    5.
    发明专利
    未知

    公开(公告)号：DE1643681A1

    公开(公告)日：1971-03-25

    申请号：DE1643681

    申请日：1967-10-21

    Applicant: BASF AG

    Inventor： DR POMMER HORST PROF ,  MUELLER HERBERT DR ,  MANGOLD DIETRICH DR ,  PALM CHRISTOF DR

    IPC: C07C47/20 ,  C07C47/26

    Abstract: 1,233,959. 4 - Hydroxytiglaldehyde derivatives. BADISCHE ANILIN- & SODAFABRIK A.G. 18 Oct., 1968 [21 Oct., 1967], No. 49541/68. Heading C2C. Ethers or esters of 4 - hydroxytiglaldehyde (2 - methyl - but - 2 - en - 1 - al - 4 - ol) are prepared by oxidizing an ether or ester of 3 - methylbut - 2 - en - 1 - ol with oxygen or a gas containing oxygen in the presence of a heavy metal/ bromine catalyst in the liquid phase at 20-200‹ C. The catalyst comprises a heavy metal source which may be a salt containing the metal in the cation or anion, a complex salt or an oxide of e.g. V, Cr, Mo, W, Mn, Fe, Co, Sn or Ce, and a bromine source which is bromine or a compound which contains or readily yields bromide, e.g. HBr an alkali metal, alkaline earth metal or ammonium bromide, bromoform, allyl bromide or benzyl bromide. A solvent may be used. Examples prepare 4- acetoxytiglaldehyde from 3-methyl-1-acetoxybut-2-ene.

    7.
    发明专利
    未知

    公开(公告)号：ES2112449T3

    公开(公告)日：1998-04-01

    申请号：ES94111094

    申请日：1994-07-16

    Applicant: BASF AG

    Inventor： BECKER RAINER DR ,  HUELLMANN MICHAEL DR ,  PALM CHRISTOF DR ,  FRANZISCHKA WOLFGANG DR

    IPC: C08G65/06 ,  C08G65/02 ,  C08G65/10 ,  C08G65/20 ,  C08G65/26

    Abstract: A process for the preparation of polytetrahydrofuran or C2- to C10-alkylene oxide-tetrahydrofuran copolymers having a mean molecular weight of from 250 to 20000 daltons by cationic polymerisation of tetrahydrofuran or tetrahydrofuran and C2- to C10-alkylene oxides in the presence of a promoter, in which process the catalyst used is a mixture of one or more C2- to C6-di- or tricarboxylic acids with boric acid.

    PROCESS FOR THE PREPARATION OF TETRAHYDROFURAN
    8.
    发明专利
    PROCESS FOR THE PREPARATION OF TETRAHYDROFURAN 未知

    公开(公告)号：DE3567861D1

    公开(公告)日：1989-03-02

    申请号：DE3567861

    申请日：1985-02-15

    Applicant: BASF AG

    Inventor： MUELLER HERBERT DR ,  PALM CHRISTOF DR

    IPC: C07D307/08

    Abstract: Tetrahydrofuran is prepared from a crude alkaline aqueous solution of butane-1,4-diol, as obtained by reaction of acetylene with aqueous formaldehyde and catylytic hydrogenation of the resulting but-2-yne-1,4-diol solution by a process in which the alkaline solution is first neutralized with sulfuric acid and water is then eliminated in the liquid phase at from 200 DEG to 260 DEG C., under superatmospheric pressure and in the presence of phosphoric acid.

    9.
    发明专利
    未知

    公开(公告)号：DE3726805A1

    公开(公告)日：1989-02-23

    申请号：DE3726805

    申请日：1987-08-12

    Applicant: BASF AG

    Inventor： PALM CHRISTOF DR ,  HUCHLER OTTO HERMANN DR ,  PESSEL ULRICH-DIETER ,  HOLLBORN ERDMANN ,  SCHMITT DIETER DR

    IPC: C07D307/08

    Abstract: Crude water-containing tetrahydrofuran is purified by distillation by a process in which the crude tetrahydrofuran is passed through three distillation columns, water being removed from the bottom of the first column, water-containing tetrahydrofuran being recycled from the top of the second column into the first column, the top product of the third column being recycled to the first column, a distillate being removed at the top of the first column, and pure tetrahydrofuran being distilled off from the bottom product of the second column, in the third column, and the pure tetrahydrofuran being removed from the side take-off of the third column.

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