14.
    发明专利
    未知

    公开(公告)号:DE10032266A1

    公开(公告)日:2002-01-17

    申请号:DE10032266

    申请日:2000-07-03

    Applicant: BASF AG

    Abstract: The invention relates to a method for the single-step production of polytetrahydrofuran and/or tetrahydrofuran copolymers having an average molecular weight of 650 to 5000 daltons by polymerizing tetrahydrofuran on an acidic heterogeneous catalyst in the presence of at least one telogen and/or comonomer of the group of the alpha, omega diols, water, polytetrahydrofuran having a molecular weight of 200 to 700 daltons and/or of the cyclic ethers, characterized by a) removing the suspended and/or dissolved catalyst components and/or secondary products of the catalyst contained in the polymerization product, b) carrying out a separation in at least one distillation step from the resulting catalyst-free polymerization product to give a distillation product that contains the polymerization product and at least one tetrahydrofuran fraction, and returning at least part of the tetrahydrofuran fraction to the polymerization, and c) removing from the distillation residue of processing step b) the low-molecular polytetrahydrofuran and/or tetrahydrofuran copolymers that have an average molecular weight of 200 to 700 daltons, and obtaining a polytetrahydrofuran and/or tetrahydrofuran copolymer that has an average molecular weight of 650 to 5000 daltons.

    17.
    发明专利
    未知

    公开(公告)号:DE502004004895D1

    公开(公告)日:2007-10-18

    申请号:DE502004004895

    申请日:2004-06-19

    Applicant: BASF AG

    Abstract: A process for obtaining oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers from a methanolic crude product which contains polytetrahydrofuran or tetrahydrofuran copolymers and is obtained in the transesterification of the mono- and/or diesters of polytetrahydrofuran or tetrahydrofuran copolymers with methanol, which includes a) removing the majority of the methanol from the crude product in a first distillation stage, b) separating the resulting bottom product by distillation into a top fraction containing the oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers, and polytetrahydrofuran or tetrahydrofuran copolymer, and c) condensing the oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers out of the top fraction from stage b).

    PROCEDIMIENTO MEJORADO PARA LA PRODUCCION DE POLITETRAHIDROFURANO.

    公开(公告)号:ES2254714T3

    公开(公告)日:2006-06-16

    申请号:ES02754941

    申请日:2002-07-26

    Applicant: BASF AG

    Abstract: Procedimiento para la producción en una etapa de politetrahidrofurano y/o copolímeros de tetrahidrofurano de un peso molecular medio de desde 650 hasta 5.000 Dalton mediante la polimerización de tetrahidrofurano en un catalizador ácido en presencia de al menos un telógeno y/o comonómero, caracterizado porque se añade el telógeno y/o comonómero en al menos dos puntos de adición en diferentes segmentos de un reactor individual de polimerización subdividido en segmentos mediante estructuras internas apropiadas o en una cascada de al menos dos reactores de polimerización, en la que un segmento es un reactor de caldera o tubular, añadiéndose al menos un 5% en peso del telógeno y/o comonómero a partir del segundo punto de adición.

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