Patents Assigned to Snamprogetti
  • Synthetic crystalline porous material containing oxides of silicon, titanium and gallium
    Patent number: 5888471
    Abstract: A synthetic, crystalline, porous material is disclosed, together with the related preparation process. Such material of zeolitic nature containing oxides of silicon, titanium and gallium corresponds, in the calcined and anhydrous state, to the following empyrical formula:pHGaO.sub.2.qTiO.sub.2.SiO.sub.2,wherein p has a value greater than zero and smaller than or equal to 0.050, and q has a value greater than zero and smaller than or equal to 0.025, and the H.sup.+ of HGaO.sub.2 can be at least partially replaceable or replaced by cations.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: March 30, 1999
    Assignees: Eniricerche S.p.A., Enichem Synthesis S.p.A., Snamprogetti
    Inventors: Giuseppe Bellussi, Mario Gabriele Clerici, Angela Carati, Antonio Esposito
  • Process for the polymerization of alpha-olefins, catalyst employed in said process and method for the preparation thereof
    Patent number: 4239873
    Abstract: An alpha-olefin such as ethylene is polymerized in the presence of a catalyst system consisting of (1) an alkyl-halide, alkyl-derivative or hydride of a metal belonging to one of the first three groups of the periodic system and (2) the combination product of a transition metal chloride and titanium trichloride, supported on a previously chlorinated material such as chlorinated .gamma.-alumina having a high superficial area.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: December 16, 1980
    Assignee: Snamprogetti
    Inventors: Sebastiano Cesca, Alberto Greco, Guglielmo Bertolini, Mario Bruzzone