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    MANUFACTURE OF LOW DENSITY ETHYLENE POLYMERS OF IMPROVED HOMOGENEITY
    11.
    发明专利
    MANUFACTURE OF LOW DENSITY ETHYLENE POLYMERS OF IMPROVED HOMOGENEITY 未知

    公开(公告)号：CA1090044A

    公开(公告)日：1980-11-18

    申请号：CA302716

    申请日：1978-05-05

    Applicant: BASF AG

    Inventor： BUECHNER OSKAR ,  GIERTH VOLKER

    IPC: C08F6/00 ,  C08F2/34 ,  C08F6/04 ,  C08F6/06 ,  C08F10/00 ,  C08F10/02 ,  C08F110/02 ,  C08F212/02 ,  C08F6/28

    Abstract: A process for the continuous high pressure polymerization Or ethylene in a polymerization system which comprises a polymerization zone (A) a high pressure product isolation zone (B), a throttling and control system (C), a low pressure product isolation zone (D), a second throttling and control system (E) and a discharge extruder (F), and wherein, according to the invention, the level Or the ethylene polymer in the high pressure product isolation zone (B) and in the low pressure product isolation zone (D) is carried periodically. The process gives an ethylene polymer Or improved homogeneity, which when used to manufacture films does not tend to form specks or fisheyes.

    MANUFACTURE OF ETHYLENE COPOLYMERS
    14.
    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.

    PROCESS FOR LETTING DOWN ETHYLENE HIGH PRESSURE POLYMERIZATION SYSTEMS
    19.
    发明专利
    PROCESS FOR LETTING DOWN ETHYLENE HIGH PRESSURE POLYMERIZATION SYSTEMS 未知

    公开(公告)号：CA1080895A

    公开(公告)日：1980-07-01

    申请号：CA281927

    申请日：1977-07-04

    Applicant: BASF AG

    Inventor： BECKER ROLF ,  BORHO KLAUS ,  BUECHNER OSKAR ,  GROPPER HANS ,  HARTIG ULRICH

    IPC: B01J3/00 ,  C08F2/00 ,  C08F2/34 ,  C08F10/00 ,  C08F10/02

    Abstract: O.Z. 32,091 The invention relates to a process for rapidly letting-down the pressure in continuous high pressure polymerization systems for the polymerization of ethylene. In this process, the let-down hot reaction mixture is passed into an expansion vessel in such a way that the jet of let-down hot reaction mixture issuing from the let-down line is led into the partially water-filled expansion vessel at an angle of from 0 to 45.degree. to the water surface, so that the jet does not enter below the surface but must touch or strike it. The method described makes it possible to let the mixture down partially and thus to slow down the decomposition in the case of explosive decomposition reactions occurring in the polymerization system.

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