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26 records (took 0.021 seconds)

    12.
    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

    Inventor： BOHNER GERD ,  DOMSCHKE THOMAS ,  FISCHER ROLF HARTMUTH ,  HAUBNER MARTIN ,  SIGWART CHRISTOPH ,  STEINBRENNER ULRICH ,  TRAGUT CHRISTIAN

    IPC: C08G65/20 ,  C08G65/30 ,  C08G65/32 ,  C07C41/01 ,  C07C43/10 ,  C07C41/58

    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.

    14.
    发明专利
    未知

    公开(公告)号：DE50205051D1

    公开(公告)日：2005-12-29

    申请号：DE50205051

    申请日：2002-07-26

    Applicant: BASF AG

    Inventor： STEINBRENNER ULRICH ,  HAUBNER MARTIN ,  GERSTLAUER ACHIM ,  DOMSCHKE THOMAS ,  SIGWART CHRISTOPH ,  KAESHAMMER STEFAN

    IPC: C08G65/20 ,  C08G65/26

    Abstract: In a process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over an acid catalyst in the presence of at least one telogen and/or comonomer, the telogen and/or comonomer is added at at least two addition points in different segments of the polymerization apparatus.

    17.
    发明专利
    未知

    公开(公告)号：DE10015855A1

    公开(公告)日：2001-10-11

    申请号：DE10015855

    申请日：2000-03-30

    Applicant: BASF AG

    Inventor： OOST CARSTEN ,  DOMSCHKE THOMAS

    IPC: B01D1/30 ,  B08B17/02 ,  B08B17/06 ,  F28F13/18 ,  F28F19/00 ,  B01D1/00

    Abstract: Apparatus part has a self-cleaning micro-structured surface with protrusions and recesses. An Independent claim is also included for a process for vaporizing solutions in a vaporizer having a self-cleaning micro-structured heat exchanger surface. Preferred Features: The micro-structured surface is produced by a powder coating.

    PROCEDIMIENTO MEJORADO PARA LA PRODUCCION DE POLITETRAHIDROFURANO.
    18.
    发明专利
    PROCEDIMIENTO MEJORADO PARA LA PRODUCCION DE POLITETRAHIDROFURANO. 未知

    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

    Inventor： STEINBRENNER ULRICH ,  HAUBNER MARTIN ,  GERSTLAUER ACHIM ,  DOMSCHKE THOMAS ,  SIGWART CHRISTOPH ,  KASHAMMER STEFAN

    IPC: C08G65/20 ,  C08G65/26

    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.

    19.
    发明专利
    未知

    公开(公告)号：DE50301577D1

    公开(公告)日：2005-12-08

    申请号：DE50301577

    申请日：2003-07-07

    Applicant: BASF AG

    Inventor： KAIBEL GERD ,  MERGER MARTIN ,  DOMSCHKE THOMAS ,  DECKERT PETRA ,  SAUER FRIEDRICH

    IPC: C07D307/62

    Abstract: The invention relates to a method for the separation of ascorbic acid from a mixture containing ascorbic acid and 2-keto-L-gulonic acid in a polar, preferably aqueous solvent, by means of liquid/liquid extraction using an amide. The method preferably also comprises steps for the back-extraction of the ascorbic acid, recycling of the extraction solvent and/or the back extraction solvent and for isolation of the ascorbic acid from the back extraction solvent. The invention further relates to a method for the production of ascorbic acid from KGA and isolation of the ascorbic acid so produced.

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