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    PRODUCTION OF ETHYLENE COPOLYMERS
    1.
    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.

    Process for separation of the solvents from polyethylene formed in high-pressure polymerisation of ethylene in the presence of solvents and from the low-pressure circulating gas
    4.
    发明专利
    Process for separation of the solvents from polyethylene formed in high-pressure polymerisation of ethylene in the presence of solvents and from the low-pressure circulating gas 未知

    公开(公告)号：GB918459A

    公开(公告)日：1963-02-13

    申请号：GB4322761

    申请日：1961-12-04

    Applicant: BASF AG

    Inventor： EILBRACHT HANS ,  PFANNMUELLER HELMUT ,  ROTZOLL RUDI-HEINZ ,  URBAN FRIEDRICH ,  ZACHER WIELAND

    IPC: C08F10/00

    Abstract: A process for removing solvent from polyethylene produced in a high pressure continuous process and from the low-pressure recycle gas comprises the steps of separating the polyethylene from the reaction mixture in a high pressure separator 10 at a pressure of more than 150 atmospheres and while maintaining a definite level of liquid therein is decompressed into a low-pressure separator 13 from which the entrained residual ethylene and solvent are led through a gas cooler 23 into a third separator 24 where the ethylene is substantially freed from solvent and led at atmospheric pressure with the remaining solvent to a countercurrent heat-exchanger 26. The ethylene separated in the high-pressure separator with the bulk of the solvent is cooled in a precooler 16, part of this is expanded and separated from the solvent in a low-temperature separator 19 and returned through said heat-exchanger 26 and a second heat-exchanger 28 to the precompressor 3 where it is mixed with fresh ethylene 1. The remainder of the ethylene from the precooler 16 is further cooled in an after-cooler 21 and supplied to the after-compressor 5 before passing to the reaction vessel 7. Solvent is removed from the system by valves 20 and 25 and enters the system by valve 31. Polyethylene is removed through valve 14.

    MANUFACTURE OF ETHYLENE COPOLYMERS
    7.
    发明专利
    MANUFACTURE OF ETHYLENE COPOLYMERS 未知

    公开(公告)号：CA1130045A

    公开(公告)日：1982-08-17

    申请号：CA319541

    申请日：1979-01-12

    Applicant: BASF AG

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

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

    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, whilst 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 to -30.degree.C before it is fed into the low temperature separator. There is a substantial improvement in the efficiency of separating off the comonomer.

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