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    METHOD OF CONTINUOUSLY EXTRACTING POLYAMIDE
    81.
    发明专利
    METHOD OF CONTINUOUSLY EXTRACTING POLYAMIDE 未知

    公开(公告)号：PL341572A1

    公开(公告)日：2001-04-23

    申请号：PL34157298

    申请日：1998-11-24

    Applicant: BASF AG

    Inventor： HILDENBRAND PETER ,  LANG REINHARD ,  LUDWIG ALFONS ,  PIPPER GUNTER

    IPC: B29B9/16 ,  C08G69/16 ,  C08J3/12 ,  C08G69/46

    Abstract: A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous epsi-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40° C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers.

    85.
    发明专利
    未知

    公开(公告)号：BR9815036A

    公开(公告)日：2000-10-03

    申请号：BR9815036

    申请日：1998-11-24

    Applicant: BASF AG

    Inventor： ERBES JORG ,  LUDWIG ALFONS ,  PIPPER GUNTER

    IPC: C08J3/12 ,  B01D11/02 ,  B29B9/16 ,  C08G69/00 ,  C08G69/04 ,  C08G69/16 ,  C08G69/46

    Abstract: A process for continuous extraction of polyamide particles using a recirculating extractant in a vertical extraction column that is divided into two zones comprises treating the polyamide with an aqueous extractant comprising from 40 to 95% by weight of epsi-caprolactam in a first zone at from 100 to 140° C., and then effecting an aftertreatment with water in a second zone. The caprolactam can then be extracted in a conventional manner. The process provides for economical production of polyamide having a low dimer content.

    86.
    发明专利
    未知

    公开(公告)号：ID24575A

    公开(公告)日：2000-07-27

    申请号：ID20000977

    申请日：1998-11-24

    Applicant: BASF AG

    Inventor： ERBES JORG ,  LUDWIG ALFONS ,  PIPPER GUNTER

    IPC: C08J3/12 ,  B01D11/02 ,  B29B9/16 ,  C08G69/00 ,  C08G69/04 ,  C08G69/16 ,  C08G69/46

    Abstract: A process for continuous extraction of polyamide particles using a recirculating extractant in a vertical extraction column that is divided into two zones comprises treating the polyamide with an aqueous extractant comprising from 40 to 95% by weight of epsi-caprolactam in a first zone at from 100 to 140° C., and then effecting an aftertreatment with water in a second zone. The caprolactam can then be extracted in a conventional manner. The process provides for economical production of polyamide having a low dimer content.

    PREPARACION DE POLIAMIDAS DE AMINONITRILOS
    87.
    发明专利
    PREPARACION DE POLIAMIDAS DE AMINONITRILOS 未知

    公开(公告)号：CO4870784A1

    公开(公告)日：1999-12-27

    申请号：CO97050221

    申请日：1997-08-29

    Applicant: BASF AG

    Inventor： WEISS ROBERT ,  KRAUSS DIETER ,  KELLER DIETER ,  GUNTER PIPPER ,  HARDER WOLFGANG ,  LUDWIG ALFONS ,  MOHRSCHLADT RALF

    IPC: C08G69/00 ,  C08G69/04 ,  C08G69/08 ,  C08G69/28 ,  C08G69/36

    Abstract: Un proceso para preparar una poliamida por reacción de al menosun aminonitrilo con agua que comprende las siguientes etapas: (1) hacer reaccionar al menos un aminonitrilo con agua a una temperatura entre 100 a 360°C y una presión entre 0.1 a 35 x 106 Pa para obtener una mezcla de reacción, (2) reaccionar además la mezcla de reacción a una temperatura de 150 a 400°C y una presión que es menor ala presión en el paso 1, la temperatura y la presión son seleccionados de tal forma que se obtiene una primera fase de gas y una primera fase líquida o una primera fase sólida o una mezcla de primer fase sólida y primer fase líquida, y separando la primera fase de gas de la primer fase líquida o la primer fase sólida o de la mezcla de la primer fase líquida y primer fase sólida, y (3) mezclar la primer fase líquida o la primer fase sólida o la mezcla de primer fase líquida y primera fase sólida con una fase gaseosa o base líquida que comprende agua a una temperatura entre 150 a 360°C y una presión entre 0.1 a 30 X 106 Pa para obtener un producto de mezcla.

    90.
    发明专利
    未知

    公开(公告)号：DE59501507D1

    公开(公告)日：1998-04-02

    申请号：DE59501507

    申请日：1995-08-16

    Applicant: BASF AG

    Inventor： KRONER MATTHIAS ,  SCHORNICK GUNNAR ,  STROTMANN UWE ,  SCHWENDEMANN VOLKER ,  MEYER THOMAS ,  LUDWIG ALFONS

    IPC: C08G69/10 ,  C02F5/12 ,  C08G73/06 ,  C08G73/10 ,  C11D3/37

    Abstract: PCT No. PCT/EP95/03224 Sec. 371 Date Feb. 27, 1997 Sec. 102(e) Date Feb. 27, 1997 PCT Filed Aug. 16, 1995 PCT Pub. No. WO96/06879 PCT Pub. Date Mar. 7, 1996A process for preparing salts of polyaspartic acid by treating polycondensates in aqueous medium with bases, employing at least 0.7 equivalent of an alkali metal and/or alkaline earth metal base per mole of the aspartimide, aspartic acid and/or aspartamide units present in the polycondensates, and the bases being added within from 30 min to 20 hours to an aqueous suspension of polycondensates of aspartic acid which has been heated to 40 DEG -140 DEG C., and the reaction mixture being allowed to react further where appropriate, and the use of alkali metal and/or alkaline earth metal salts of polyaspartic acids obtainable by treating polycondensates of aspartic acid in aqueous medium with more than 1 equivalent of an alkali metal and/or alkaline earth metal base, with the molecular weight of the polycondensates being reduced, as additive to detergents and cleaners.

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