Olefin polymerization catalyst
    22.
    发明授权
    Olefin polymerization catalyst 失效
    烯烃聚合催化剂

    公开(公告)号:US4397769A

    公开(公告)日:1983-08-09

    申请号:US250446

    申请日:1981-04-02

    IPC分类号: B01J23/26 C08F10/00 B01J21/06

    CPC分类号: B01J23/26 C08F10/00

    摘要: A supported chromium oxide polymerization catalyst is prepared by a process which includes the steps of heating silica-supported chromium oxide or a substance oxidizable to chromium oxide in a nonoxidizing atmosphere in the presence of formaldehyde or a compound thermally decomposable to formaldehyde, and then heating the thus-treated catalyst in an oxygen-containing atmosphere. The temperatures of the respective heating steps can vary depending upon the properties desired in the polymer to be produced with the invention catalyst; however, the invention catalyst preparation method enables the production of a catalyst having a high melt index potential at relatively low treatment temperatures, e.g. no higher than about 600.degree. C.

    摘要翻译: 一种负载型氧化铬聚合催化剂的制备方法包括以下步骤:在甲醛或可热分解成甲醛的化合物的存在下,在非氧化性气氛中加热二氧化硅负载的氧化铬或氧化铬的物质,然后加热 在含氧气氛中处理的催化剂。 各加热步骤的温度可以根据本发明催化剂生产的聚合物中所需的性能而变化; 然而,本发明的催化剂制备方法使得能够在相对低的处理温度下制备具有高熔体指数电位的催化剂,例如, 不高于约600℃

    Florided aluminas, catalysts, and polymerization processes
    27.
    发明授权
    Florided aluminas, catalysts, and polymerization processes 失效
    浮选氧化铝,催化剂和聚合方法

    公开(公告)号:US5221655A

    公开(公告)日:1993-06-22

    申请号:US931099

    申请日:1992-08-14

    IPC分类号: C08F10/00

    CPC分类号: C08F10/00

    摘要: High surface are aluminas are pre-calcined to form gamma-alumina. In one embodiment, the gamma-alumina is treated with an anhydrous solution of a fluorine-containing compound. In a second embodiment, alumina is precipitated in the pores of the gamma-alumina and then treated with a fluorine-containing compound. In a third embodiment a cogel of aluminum trifluoride and aluminum hydroxide is prepared. The three inventive fluorided alumina supports can be impregnated with a transition metal, preferably chromium, to form a catalyst system which can be used to polymerize mono-1-olefins.

    摘要翻译: 高表面是氧化铝被预煅烧以形成γ-氧化铝。 在一个实施方案中,γ-氧化铝用含氟化合物的无水溶液处理。 在第二实施方案中,氧化铝在γ-氧化铝的孔中沉淀,然后用含氟化合物处理。 在第三个实施方案中,制备三氟化铝和氢氧化铝的共凝胶。 三种本发明的氟化氧化铝载体可以用过渡金属(优选铬)浸渍以形成可用于聚合单-1-烯烃的催化剂体系。

    Polyphosphate in chromium catalyst support
    29.
    发明授权
    Polyphosphate in chromium catalyst support 失效
    多磷酸铬催化剂载体

    公开(公告)号:US4547479A

    公开(公告)日:1985-10-15

    申请号:US626944

    申请日:1984-07-02

    CPC分类号: C08F10/00

    摘要: A catalyst support based on aluminum polyphosphate or polyphosphoric acid-impregnated alumina is provided by two alternative techniques. In the first embodiment, an aluminum polyphosphate composition is heated in a dry atmosphere and thereafter impregnated with a zerovalent chromium component under anhydrous conditions. The resulting catalyst is active for olefin polymerization. In the second embodiment, alumina is impregnated with a polyphosphoric acid composition. This resulting polyphosphoric acid impregnated alumina can be used as a support for zerovalent chromium or can be impregnated with a chromium component and oxidized to give an active hexavalent chromium species. The resulting catalysts are advantageous because of their unusual sensitivity to hydrogen thus allowing great leeway in molecular weight control.

    摘要翻译: 通过两种替代技术提供了基于聚磷酸铝或多磷酸浸渍的氧化铝的催化剂载体。 在第一实施方案中,将聚磷酸铝组合物在干燥气氛中加热,然后在无水条件下用零价铬组分浸渍。 所得催化剂对于烯烃聚合是有活性的。 在第二实施方案中,用多磷酸组合物浸渍氧化铝。 所得多磷酸浸渍的氧化铝可用作零价铬的载体,或可用铬成分浸渍并氧化,得到活性六价铬物质。 所得到的催化剂是有利的,因为它们对氢气具有不寻常的敏感性,从而允许在分子量控制方面具有很大的余地。