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    PROCESS FOR THE PREPARATION OF ETHYLENE COPOLYMERS
    3.
    发明专利
    PROCESS FOR THE PREPARATION OF ETHYLENE COPOLYMERS 未知

    公开(公告)号：DE2962013D1

    公开(公告)日：1982-03-11

    申请号：DE2962013

    申请日：1979-01-18

    Applicant: BASF AG

    Inventor： ZACHER WIELAND DR ,  PFLEGER KLAUS DR ,  BOETTCHER KLAUS DR ,  SKORCZYK RONALD ,  BUECHNER OSKAR DR

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

    Abstract: A continuous process for the manufacture of ethylene copolymers under high pressure and at high temperature in a polymerization zone, with transfer of the reaction mixture into a high pressure product isolation zone and from there into a low pressure product isolation zone, and recycling of the unconverted gas from the high pressure product isolation zone into the polymerization zone and from the low pressure product isolation zone into a low temperature separator, from where the comonomer separated off is recycled to the polymerization process, while the ethylene is discharged as off-gas. The gas taken off the low pressure product isolation zone is preferably compressed to from 10 to 20 bar and cooled to from -10 DEG to -30 DEG C. before it is fed into the low temperature separator. There is a substantial improvement in the efficiency of separating off the comonomer.

    PROCESS FOR THE PRODUCTION OF ETHYLENE COPOLYMERS
    7.
    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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