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    4.
    发明专利
    未知

    公开(公告)号：DE2631834A1

    公开(公告)日：1978-01-19

    申请号：DE2631834

    申请日：1976-07-15

    Applicant: BASF AG

    Inventor： BECKER ROLF DIPL ING DR ,  BORHO KLAUS DIPL ING DR ,  BUECHNER OSKAR DIPL CHEM DR ,  GROPPER HANS DIPL CHEM DR ,  HARTIG ULRICH DIPL CHEM DR

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

    Abstract: 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 DEG to 45 DEG 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.

    5.
    发明专利
    未知

    公开(公告)号：DE2611405A1

    公开(公告)日：1977-09-22

    申请号：DE2611405

    申请日：1976-03-18

    Applicant: BASF AG

    Inventor： OEDER DIETER DIPL CHEM DR ,  GROPPER HANS DIPL CHEM DR ,  URBAN FRIEDRICH DIPL CHEM DR

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

    Abstract: Ethylene polymers are manufactured by polymerizing ethylene under high pressure at high temperatures in an autoclave reactor. The heat of reaction generated by the polymerization is removed, within the reactor, by a cooling system in which the cooling medium is ethylene; the pressure of the monomer in the cooling system should differ by from 0 to 200 bars from the pressure prevailing in the polymerization system, and the temperature of the monomer on entering the cooling system is at least 40 DEG C. lower than the temperature prevailing in the autoclave. The process permits an increase in the conversion achieved in the polymerization reaction.

    9.
    发明专利
    未知

    公开(公告)号：DE2557653A1

    公开(公告)日：1977-06-30

    申请号：DE2557653

    申请日：1975-12-20

    Applicant: BASF AG

    Inventor： URBAN FRIEDRICH DIPL CHEM DR ,  BUECHNER OSKAR DIPL CHEM DR ,  HARTIG ULRICH DIPL CHEM DR ,  GROPPER HANS DIPL CHEM DR

    IPC: C08F2/00 ,  C08F4/28 ,  C08F10/00 ,  C08F10/02

    Abstract: Ethylene polymers are manufactured in a tubular reactor under high pressure and at high temperatures in the presence of polymerization initiators. The polymerization is carried out in two different zones of the reactor, a mixture of ethylene, oxygen and regulator being fed into the first zone and a co-initiator having a half-life temperature, measured in benzene, of above 140 DEG C being additionally fed into the second zone. The co-initiator may be a peroxide or a hydroperoxide. The melt index, or the haze and gloss of a film produced from the resulting ethylene polymer, can be varied advantageously through the choice of the co-initiator.

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