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    VERBESSERTES VERFAHREN ZUR EINSTUFIGEN HERSTELLUNG VON POLYTETRAHYDROFURAN UND TETRAHYDROFURAN-COPOLYMEREN
    1.
    发明公开
    VERBESSERTES VERFAHREN ZUR EINSTUFIGEN HERSTELLUNG VON POLYTETRAHYDROFURAN UND TETRAHYDROFURAN-COPOLYMEREN 审中-公开
    改进方法聚四氢呋喃和四氢呋喃的共聚物的制备阶段

    公开(公告)号：EP1299449A1

    公开(公告)日：2003-04-09

    申请号：EP01945325.7

    申请日：2001-06-29

    申请人： BASF AKTIENGESELLSCHAFT

    发明人： BOHNER, Gerd ,  DOMSCHKE, Thomas ,  FISCHER, Rolf-Hartmuth ,  HAUBNER, Martin ,  SIGWART, Christoph ,  STEINBRENNER, Ulrich ,  TRAGUT, Christian

    IPC分类号： C08G65/20 ,  C08G65/30

    CPC分类号： C08G65/30 ,  C08G65/20

    摘要： 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.

    VERFAHREN ZUR ABTRENNUNG VON ASCORBINSÄURE AUS EINEM POLAREN, ASCORBINSÄURE UND 2-KETO-L-GULONSÄURE ENTHALTENDEN LÖSUNGSMITTEL
    2.
    发明公开
    VERFAHREN ZUR ABTRENNUNG VON ASCORBINSÄURE AUS EINEM POLAREN, ASCORBINSÄURE UND 2-KETO-L-GULONSÄURE ENTHALTENDEN LÖSUNGSMITTEL 有权
    VERFAHREN ZUR ABTRENNUNG VONASCORBINSÄUREAUS EINEM POLAREN，ASCORBINSÄUREUND 2-KETO-L-GULONSÄUREENTHALTENDENLÖSUNGSMITTEL

    公开(公告)号：EP1523477A1

    公开(公告)日：2005-04-20

    申请号：EP03763731.1

    申请日：2003-07-07

    申请人： BASF AKTIENGESELLSCHAFT

    发明人： KAIBEL, Gerd ,  MERGER, Martin ,  DOMSCHKE, Thomas ,  DECKERT, Petra ,  SAUER, Friedrich

    IPC分类号： C07D307/62

    CPC分类号： C07D307/62 ,  Y02P20/582

    摘要： 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.

    摘要翻译： 本发明涉及一种从含有抗坏血酸和2-酮基-L-古洛糖酸的混合物中通过使用酰胺的液/液萃取在极性，优选水性溶剂中分离抗坏血酸的方法。 该方法优选还包括反萃取抗坏血酸的步骤，萃取溶剂和/或反萃取溶剂的循环以及从反萃取溶剂中分离抗坏血酸。 本发明还涉及由KGA生产抗坏血酸并分离如此生产的抗坏血酸的方法。

    VERFAHREN ZUR HERSTELLUNG VON 2-KETO-L-GULONSÄURE-C-4 C-10 /sb -ALKYLESTERN
    5.
    发明授权
    VERFAHREN ZUR HERSTELLUNG VON 2-KETO-L-GULONSÄURE-C-4 C-10 /sb -ALKYLESTERN 有权
    PROCESS FOR 2-酮基-L-古洛糖酸C-4 C-10 / SB - 烷基的制备

    公开(公告)号：EP1562965B1

    公开(公告)日：2006-04-05

    申请号：EP03789016.7

    申请日：2003-11-07

    申请人： BASF Aktiengesellschaft

    发明人： DOMSCHKE, Thomas ,  MERGER, Martin ,  GROSSMANN, Georg ,  FAUST, Tillmann

    IPC分类号： C07H7/027

    CPC分类号： C07H7/027 ,  Y02P20/127

    摘要： The invention relates to a method for producing 2-keto-L-gulonic acid-C4-C10 alkyl ester by esterifying 2-keto-L-gulonic acid (KGS) with an unsaturated, branched or unbranched C4-C10 alcohol. The inventive method is characterized by the fact that an aqueous KGS solution is reacted with a C4-C10 alcohol up to an esterification degree of 20 to 70 percent in a pre-esterification process carried out under acidic catalysis conditions; and the obtained product is dehydrogenated with an unsaturated, branched or unbranched C4-C10 alcohol in a continuous rectification device, whereby the esterification reaction continues, n-butanol preferably being used as the alkyl alcohol. In a preferred embodiment, the aqueous KGS solution is concentrated up to or beyond the limit of solubility prior to the esterification process, preferably by catalyzing a homogeneous or heterogeneous catalyst, especially sulfonic acid, at temperatures of 50 to 120 °C. In another embodiment, the produced KGS ester is reacted in one or several additional steps so as to obtain L-ascorbic acid.