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21 records (took 0.021 seconds)

    11.
    发明专利
    未知

    公开(公告)号：DE3615563A1

    公开(公告)日：1987-11-12

    申请号：DE3615563

    申请日：1986-05-09

    Applicant: BASF AG

    Inventor： PFLEGER KLAUS DR ,  BOETTCHER KLAUS DR ,  BUECHNER OSKAR DR ,  KANNE FRIEDRICH DR ,  KURSAWE SIEGFRIED

    IPC: C08F2/00 ,  C08F2/38 ,  C08F210/00 ,  C08F210/02 ,  C08F210/16

    Abstract: Copolymers of ethylene with vinyl esters are prepared in a continuously operated tubular polymerization system at high pressure and temperatures by feeding a mixture of ethylene, vinyl ester, initiator and, if appropriate, regulant into the polymerization system in the form of a mainstream at the inlet point thereof and at the same time through two or more secondary streams downstream of the inlet point, secondary streams (I) being metered in at points where the reaction temperature has just exceeded a maximum temperature due to the heat of polymerization and secondary streams (II) at points which, relative to the direction of flow of the ethylene, are upstream of the feed points of secondary streams (I) and upstream of the respective maximum temperature.

    PROCESS FOR THE PRODUCTION OF ETHYLENE COPOLYMERS
    17.
    发明专利
    PROCESS FOR THE PRODUCTION OF ETHYLENE COPOLYMERS 未知

    公开(公告)号：DE2963193D1

    公开(公告)日：1982-08-12

    申请号：DE2963193

    申请日：1979-12-06

    Applicant: BASF AG

    Inventor： PFLEGER KLAUS DR ,  ZACHER WIELAND DR ,  BOETTCHER KLAUS DR ,  SKORCZYK RONALD CHEM ING ,  BUECHNER OSKAR DR ,  MIETZNER FRANZ GEORG DR

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

    Abstract: 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-compressor, 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 DEG to -50 DEG 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.

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