Polymerization of olefins
    14.
    发明授权

    公开(公告)号:US3658780A

    公开(公告)日:1972-04-25

    申请号:US3658780D

    申请日:1969-10-22

    Inventor: SCOGGIN JACK S

    Abstract: IN THE POLYMERIZATION OF AN OLEFIN, E.G., PROPYLENE, EMPLOYING HYDROGEN AS A MODIFIER IN THE POLYMERIZATION REACTION AND EXCESS MONOMER AS SOLVENT TO PRODUCE A DESIRED MELT INDEX POLYMER, RECYCLED UNPOLYMERIZED OR EXCESS MONOMER IS COMPLETELY FREED OF HYDROGEN BY FRACTIONATION OF THE RECOVERED MONOMER STREAM BY SUBMITTING THE SAME TO A DEGASSING OPERATION IN WHICH IN THE PREFERRED MODE OF OPERATION THE STREAM IS HEATED IN A FRACTIONATION ZONE TO EXPEL HYDROGEN THEREFROM AND THE OVERHEAD IS REFRIGERATED TO AVOID UNDUE LOSS OF MONOMER AND ALL OF THE MODIFIER HYDROGEN IS ADDED TO THE POLYMERIZATION REACTION FROM A SINGLE SOURCE.

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