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    CONTIUNUOUS POLYAMIDE EXTRACTION PROCESS
    61.
    发明专利
    CONTIUNUOUS POLYAMIDE EXTRACTION PROCESS 未知

    公开(公告)号：BG104459A

    公开(公告)日：2001-01-31

    申请号：BG10445900

    申请日：2000-05-18

    Applicant: BASF AG

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

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

    Abstract: A process is disclosed for continuously extracting polyamide articles from a circulating extraction solution in a vertical reaction column subdivided into two zones. In the first zone the polyamide is treated with an aqueous epsilon-caprolactam solution with 15 to 40 wt. % epsilon-caprolactam as extraction agent at 100 to 140 degrees C and water is then used in the second zone as extraction agent at a temperature 5 to 40 degrees C lower. The process allows polyamides with a low monomer and oligomer content to be economically extracted. 10 claims, 1 figure

    CONTINUOUS POLYAMIDE EXTRACTION PROCESS
    64.
    发明专利
    CONTINUOUS POLYAMIDE EXTRACTION PROCESS 未知

    公开(公告)号：CA2310849A1

    公开(公告)日：1999-06-03

    申请号：CA2310849

    申请日：1998-11-24

    Applicant: BASF AG

    Inventor： LUDWIG ALFONS ,  ERBES JORG ,  PIPPER GUNTER

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

    Abstract: A process is disclosed for continuously extracting polyamide particles from a circulating extraction solution in a vertical extraction column subdivided into two zones. The polyamide is treated in the first zone with an aqueous .epsilon.-caprolactam solution with 40-95 wt. % .epsilon.-caprolactam as extraction agent at 100 to 140 ~C, then subsequently treated with water in the second zone. Finally, the caprolactam can be extracted in a manner known per se. The process allows polyamide with a low dimer content to be economically produced.

    CONTINUOUS POLYAMIDE EXTRACTION PROCESS
    65.
    发明专利
    CONTINUOUS POLYAMIDE EXTRACTION PROCESS 未知

    公开(公告)号：CA2310848A1

    公开(公告)日：1999-06-03

    申请号：CA2310848

    申请日：1998-11-24

    Applicant: BASF AG

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

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

    Abstract: A process is disclosed for continuously extracting polyamide particles from a circulating extraction solution in a vertical extraction column subdivided into two zones. The polyamide is treated in the first zone with an aqueous .epsilon.-caprolactam solution with 15-40 wt. % .epsilon.-caprolactam as extraction agent at 100 to 140 ~C, and water is then used in the second zone as extraction agent at a temperature 5-40 ~C lower. The process allows polyamides with a low monomer and oligomer content to be economically extracted.

    Process for preparing polyamides from aminonitriles and polyamide prepared in such a manner
    70.
    发明专利
    Process for preparing polyamides from aminonitriles and polyamide prepared in such a manner 未知

    公开(公告)号：CZ293844B6

    公开(公告)日：2004-08-18

    申请号：CZ67599

    申请日：1997-08-26

    Applicant: BASF AG

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

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

    Abstract: The present invention relates to a process for preparing a polyamide by reacting at least one aminonitrile with water wherein the preparation process has the following steps: /1/ at least one aminonitrile is reacted with water at a temperature ranging from 100 to 360 degC and pressure in the range of 4 to 30 x 10e6 Pa, yielding a reaction mixture; /2/ the reaction mixture is further reacted at a temperature from 150 to 400 degC and pressure lower than the pressure in step 1. The temperature and pressure are selected to yield a first gaseous phase and a first liquid or solid phase or a mixture of a first solid and a first liquid phase. The first gaseous phase is separated from the first liquid or solid phase or the mixture of a first liquid and a first solid phase is separated; and /3/ the first liquid or solid phase or the mixture of a first liquid and first solid phase is mixed with a water-containing gaseous or liquid phase at a temperature from 150 to 360 degC and pressure from 0.1 do 30 x 10e6 Pa, yielding a product mixture. Also disclosed are other embodiments of this process and the thus produced polyamides.

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