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    Process for the preparation of ethylene polymers in a two-zone tubular reactor at pressures above 500 bar
    2.
    发明专利
    Process for the preparation of ethylene polymers in a two-zone tubular reactor at pressures above 500 bar 未知

    公开(公告)号：DE3141507A1

    公开(公告)日：1983-04-28

    申请号：DE3141507

    申请日：1981-10-20

    Applicant: BASF AG

    Inventor： WERNER MICHAEL DIPL CHEM DR ,  OEDER DIETER DIPL CHEM DR ,  WEISS FRANK DIPL ING DR ,  BALL WOLFGANG DIPL PHYS DR

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

    Abstract: The invention relates to a process for the preparation of ethylene polymers in a tubular polymerisation system at pressures of from 500 to 5000 bar and temperatures of from 50 to 450 DEG C in the presence of polymerisation initiators which decompose to form free radicals, in which a mixture of ethylene, oxygen, regulator and optionally comonomers is fed to the polymerisation system at its inlet point (A) and simultaneously to a second point (C) after the inlet point along the polymerisation system, where the reaction temperature has exceeded a maximum, and in which, in addition, an initiator whose half-value temperature, measured in benzene as solvent, is above 140 DEG C is metered in at a further point (B) of the reactor, at which the temperature of the oxygen-initiated reaction has already exceeded the maximum and which is between the inlet points (A and C). The concentration of the additionally metered-in initiator is from 0.01 to 20 mol ppm, based on the entire amount of ethylene fed to the polymerisation system. The additionally metered-in initiator is an organic peroxide, an organic hydroperoxide or a mixture of organic peroxide and hydroperoxide.

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