PROCESS FOR RECOVERING UNREACTED PROPYLENE IN MASS POLYMERIZATION

    公开(公告)号:ZA792947B

    公开(公告)日:1980-07-30

    申请号:ZA792947

    申请日:1979-06-14

    Applicant: HOECHST AG

    Abstract: During the recovery of the unreacted propylene from the mother liquor obtained in the polymerization of liquid propylene, the major part of the propylene is evaporated in a first evaporation step at a low temperature and the remaining part is evaporated in a second evaporator at a high temperature. In this way an early agglomerization of the atactic and/or low-molecular weight polymer dissolved in the mother liquor and fouling of the heat exchanger tubes and/or of the column trays is avoided.

    14.
    发明专利
    未知

    公开(公告)号:SE7502296L

    公开(公告)日:1976-08-02

    申请号:SE7502296

    申请日:1975-02-28

    Applicant: HOECHST AG

    Abstract: A catalyst of high activity and stereospecificity in alpha -olefin polymerization is obtained when titanium trichloride, prepared from titanium tetrachloride by reduction with an aluminum alkyl halide, is thermally treated, first with an ether in the presence of a cyclopolyene and the solid reaction product is then treated with an aluminum alkyl halide in the presence of a small amount of a cyclopolyene and/or an olefin. With the catalyst obtained high space-time yields of alpha -olefin polymers and copolymers can be produced.

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