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    PRODUCTION OF ETHYLENE COPOLYMERS
    12.
    发明专利
    PRODUCTION OF ETHYLENE COPOLYMERS 未知

    公开(公告)号：CA1118944A

    公开(公告)日：1982-02-23

    申请号：CA341666

    申请日：1979-12-11

    Applicant: BASF AG

    Inventor： PFLEGER KLAUS ,  ZACHER WIELAND ,  BOETTCHER KLAUS ,  SKORCZYK RONALD ,  BUECHNER OSKAR ,  MIETZNER FRANZ G

    IPC: C08F2/00 ,  C08F2/02 ,  C08F2/34 ,  C08F8/00 ,  C08F10/00 ,  C08F210/02

    Abstract: O.Z. 0050/033573 of the disclosure: A process for the continuous production of an ethylene copolymer by compressing a mixture of ethylene and comonomer in a pre-compressor and a post-compresso, copolymerizing the mixture in a polymerization zone at a high temperature and high pressure, transferring the reaction mixture into a high pressure product isolation zone, from there into a low pressure product isolation zone and thereafter into a discharge extruder, and recycling the greater part of the unconverted monomer into the polymerization process and passing a small part of the unconverted gas into a low temperature isolation zone, in which process a small part of the gas recycled from the high pressure product isolation zone is passed into the low temperature isolation zone, which is preferably under a pressure of from 10 to 30 bar and at from -10 to -50.degree.C, and all the gas taken off the low pressure product isolation zone is fed to the pre-compressor. Using the novel process, the separating-off of the comonomer which has remained unconverted in the polymerization process can be improved.

    14.
    发明专利
    未知

    公开(公告)号：PT85858A

    公开(公告)日：1988-11-30

    申请号：PT8585887

    申请日：1987-10-02

    Applicant: BASF AG

    Inventor： KANNE FRIEDRICH ,  PFLEGER KLAUS ,  GLOMB HANS ,  BOETTCHER KLAUS ,  ARNOLD GERHARD ,  KURSAWE SIEGFRIED

    IPC: B01J3/04 ,  B01J8/00 ,  B01J19/00 ,  C08F2/00 ,  C08F2/34 ,  C08F6/00 ,  C08F6/28 ,  C08F10/00

    Abstract: Separating system (1 to 11) for tubular reactors or autoclaves used for the polymerisation of ethylene or copolymerisation of ethylene with ethylenically unsaturated comonomers in the presence of initiators at pressures of from 500 to 4000 bar and temperatures of from 150 to 350 DEG C, for reducing the emission of solids during relaxation processes of the reaction mixture present in the reactor or autoclave, characterised in that the relaxed reaction mixture is passed through at least two separating tanks (1, 1a) installed in series, before reaching the atmosphere.

    16.
    发明专利
    未知

    公开(公告)号：NO875046D0

    公开(公告)日：1987-12-03

    申请号：NO875046

    申请日：1987-12-03

    Applicant: BASF AG

    Inventor： KANNE FRIEDRICH ,  MIETZNER FRANZ GEORG ,  PFLEGER KLAUS ,  KURSAWE SIEGFRIED ,  BOETTCHER KLAUS ,  ARNOLD GERHARD

    IPC: B01J19/00 ,  C08F2/00 ,  C08F2/34 ,  C08F6/00 ,  C08F10/00 ,  C08F10/02 ,  C08F

    Abstract: The pressure in a continuous high pressure polymerization system, in which ethylene, with or without comonomers, is polymerized under high pressures and temperatures and the unconverted amounts of gas are recycled through the high pressure recycle gas system into the polymerization system, is rapidly reduced to below the particular reaction pressure when predetermined limiting pressure and/or temperature values are exceeded or when other faults occur by opening one or more pressure-relief apparatuses mounted on the high pressure polymerization system and transferring the hot let-down reaction mixture from the polymerization system via one or more let-down lines through one or more separator systems into the atmosphere, by a process in which the high pressure polymerization system is divided into a plurality of isolated sections at the same time as the let-down process is triggered and only the section in which the let-down process is triggered is let down to the atmosphere. Preferably, the sections in which the let-down process is not triggered can be let down into the high pressure recycle gas system, if necessary through a product separator, in synchronization with triggering of the let-down to the atmosphere.

    19.
    发明专利
    未知

    公开(公告)号：NO167984C

    公开(公告)日：1992-01-02

    申请号：NO875046

    申请日：1987-12-03

    Applicant: BASF AG

    Inventor： KANNE FRIEDRICH ,  MIETZNER FRANZ GEORG ,  PFLEGER KLAUS ,  KURSAWE SIEGFRIED ,  BOETTCHER KLAUS ,  ARNOLD GERHARD

    IPC: B01J19/00 ,  C08F2/00 ,  C08F2/34 ,  C08F6/00 ,  C08F10/00 ,  C08F10/02

    Abstract: The pressure in a continuous high pressure polymerization system, in which ethylene, with or without comonomers, is polymerized under high pressures and temperatures and the unconverted amounts of gas are recycled through the high pressure recycle gas system into the polymerization system, is rapidly reduced to below the particular reaction pressure when predetermined limiting pressure and/or temperature values are exceeded or when other faults occur by opening one or more pressure-relief apparatuses mounted on the high pressure polymerization system and transferring the hot let-down reaction mixture from the polymerization system via one or more let-down lines through one or more separator systems into the atmosphere, by a process in which the high pressure polymerization system is divided into a plurality of isolated sections at the same time as the let-down process is triggered and only the section in which the let-down process is triggered is let down to the atmosphere. Preferably, the sections in which the let-down process is not triggered can be let down into the high pressure recycle gas system, if necessary through a product separator, in synchronization with triggering of the let-down to the atmosphere.

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