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    2.
    发明专利
    未知

    公开(公告)号：DE1116404B

    公开(公告)日：1961-11-02

    申请号：DEB0052032

    申请日：1959-02-07

    Applicant: BASF AG

    Inventor： GOEBEL DR SIEBERT ,  HAEBERLE DR MANFRED ,  ZACHER DR WIELAND ,  SCHMIDT-THOMEE DR GEORG

    IPC: C08F10/00

    Abstract: In a process for the purification of polyethylene, obtained by polymerization at pressures above 500 excess atmospheres, by freeing it from gaseous and volatile non-gaseous constituents including unreacted monomer, in which the polyethylene, after reaction using a catalyst in a reaction vessel, is led therefrom first into a separator which is at a lower pressure than the reaction pressure, preferably less than 5 excess atmospheres and thence in finely divided form with a large surface area into a degasification chamber in which the polyethylene is subjected to vacuum treatment and thence to an extruder, provision being made to exclude air over the whole path of the polyethylene from the reaction vessel to the extruder, steam is introduced into the separator at a temperature of about 150 DEG C. and is discharged from the separator together with a part of the gaseous and volatile constituents. Further steam, water or an organic solvent may be added to the polyethylene after it leaves the separator and before it enters the degasification chamber. Polymers miscible with polyethylene may be added thereto in the separator and further processed therewith. Apparatus suitable for carrying out the process of the invention is described and illustrated.

    6.
    发明专利
    未知

    公开(公告)号：DE1222676B

    公开(公告)日：1966-08-11

    申请号：DEB0067195

    申请日：1962-05-11

    Applicant: BASF AG

    Inventor： SCHMID DR KARL ,  STEDEFEDER DR JOACHIM ,  JOHN GUENTHER ,  HAEBERLE DR MANFRED ,  LAUTENSCHLAGER DR HANS ,  TRIESCHMANN DR DR HANS-GEORG

    IPC: C08F2/00 ,  B01J8/38 ,  C08F2/34 ,  C08F10/00

    Abstract: Polymers of monoolefins are made by polymerizing the monomers in the presence of a catalyst comprising chromium oxide or a "Ziegler-type" catalyst, and optionally hydrogen, at temperatures below the softening point of the polymers formed, in a fluidized bed formed from the catalysts, and the polymers formed at a flow velocity of the monoolefin in the fluidized bed of up to about 15 cm./sec., wherein the ratio of the diameter to the height of the fluidized layer is between 1:1 and 1:8 and the fluidized bed is stirred by moving the particles of polymer formed and particles of catalyst in the direction of the monoolefin by means of a stirrer having a shaft on which blades are provided in spaced relation and which rotate at 20 to 250 r.p.m. The Specification also includes an apparatus for effecting the above process which comprises a container having a cylindrical portion and an upper portion which tapers outwardly, and a shaft rotatable in the cylindrical portion which has mounted thereon a plurality of spaced blades obliquely arranged so that an upward movement is imparted to material in the container. The blades are preferably provided at their outer ends with portions in the shape of ring segments and the blades are arranged on axes which are perpendicular to the stirrer shaft and uniformly twisted with respect to each other. The Specification contains a long list of catalysts which may be used. Exemplified catalysts are chromium oxides supported on SiO2 or aluminium silicate; triisobutyaluminium and TiCl3; triethylaluminium, TiCl3, and di-n-butylformamide or diethylene glycol diethyl ether; triethylaluminium, TiCl3, and triphenylphosphine oxide; a complex of 3TiCl3.AlCl3, diethylaluminium chloride and triphenylbutylphosphonium chloride, a mixture of methylaluminium sesquichloride, carbon black, and vanadium oxychloride, and a mixture of diethylaluminium chloride and 3TiCl3.AlCl3. Exemplified monomers are ethylene, propylene, a mixture of ethylene and butene-1, a mixture of ethylene and propylene, and 4-methylpentene-1.

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