Patents Assigned to Enichem S.p.A.
  • Patent number: 7442817
    Abstract: A process in continuous is described for the preparation of oxides of olefins by the direct epoxidation of an olefin with hydrogen peroxide, or compounds capable of producing hydrogen peroxide under the reaction conditions, in a solvent medium, in the presence of a catalytic system consisting of a zeolite containing titanium and a nitrogenated organic base having formula (I). The process allows the production of high conversions and selectivities of the olefin into the corresponding oxide with a stable catalytic activity over a period of time.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: October 28, 2008
    Assignee: Enichem S.p.A
    Inventors: Giuseppe Paparatto, Anna Forlin, Paolo Tegon
  • Patent number: 7419930
    Abstract: The present invention regards a catalytic composition comprising gallium, at least one element chosen in the group of the lanthanides, and a zeolite belonging to the MFI, MEL or MFI/MEL families, the crystal lattice of which is made up of silicon oxide and at least one metal oxide chosen from among aluminum oxide, boron oxide and gallium oxide. Preferably, in the catalytic compositions of the present invention a zeolite is used belonging to the MFI family characterized by crystallites which for at least 90% have diameters smaller than 500 ? and which can form agglomerates of submicron dimensions characterized by possessing at least 30% of the extrazeolitic porosity in the region of the mesopores. The catalytic compositions of the present invention can, in addition, contain rhenium. These catalytic compositions are useful in processes of aromatization of hydrocarbons containing from 3 to 6 carbon atoms, preferably, hydrocarbon mixtures containing olefins.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: September 2, 2008
    Assignees: Eni S.p.A., Enichem S.p.A., Enitecnologie S.p.A.
    Inventors: Angela Carati, Marco Tagliabue, Carlo Perego, Roberto Millini, Stefano Amarilli, Giuseppe Terzoni
  • Patent number: 7241931
    Abstract: A highly selective process is described for preparing 2,6-dimethylnaphthalene which comprises reacting a naphthalene hydrocarbon selected from naphthalene, methylnaphthalenes, dimethylnaphthalenes, trimethylnaphthalenes, polymethylnaphthalenes, and/or their mixtures with one or more benzene hydrocarbons selected from benzene, toluene, xylenes, trimethylbenzenes, tetramethylbenzenes, pentamethylbenzene and/or hexamethylbenzene, under at least partially liquid phase conditions and in the presence of a catalytic composition comprising a zeolite belonging to the MTW structural type and at least one element selected from P, B and Si. The process is preferably carried out in the presence of a methylating agent.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: July 10, 2007
    Assignees: Enichem S.p.A., ENI S.p.A., Enitechnologie S.p.A.
    Inventors: Giannino Pazzuconi, Carlo Perego, Giuseppe Bellussi
  • Publication number: 20070042899
    Abstract: The present invention regards a catalytic composition comprising gallium, at least one element chosen in the group of the lanthanides, and a zeolite belonging to the MFI, MEL or MFI/MEL families, the crystal lattice of which is made up of silicon oxide and at least one metal oxide chosen from among aluminum oxide, boron oxide and gallium oxide. Preferably, in the catalytic compositions of the present invention a zeolite is used belonging to the MFI family characterized by crystallites which for at least 90% have diameters smaller than 500 ? and which can form agglomerates of submicron dimensions characterized by possessing at least 30% of the extrazeolitic porosity in the region of the mesopores. The catalytic compositions of the present invention can, in addition, contain rhenium. These catalytic compositions are useful in processes of aromatization of hydrocarbons containing from 3 to 6 carbon atoms, preferably, hydrocarbon mixtures containing olefins.
    Type: Application
    Filed: October 24, 2006
    Publication date: February 22, 2007
    Applicants: ENI S.p.A., ENICHEM S.p.A., ENITECHNOLOGIE S.p.A.
    Inventors: Angela Carati, Marco Tagliabue, Carlo Perego, Roberto Millini, Stefano Amarilli, Giuseppe Terzoni
  • Patent number: 7164052
    Abstract: Aromatic hydrocarbon compounds are produced by a process of contacting one or more aliphatic hydrocarbons containing from 3 to 6 carbon atoms with a catalytic composition comprising (i) gallium, (ii) at least one lanthanide element, and (iii) a zeolite selected from the group consisting of the MIF family of zeolites, the crystal lattice of which consists of silicon oxide and aluminum oxide in a molar ratio of silicon oxide to aluminum oxide which is greater than 20 and less than 500, and is comprised of crystallites, at least 90% of which have diameters smaller than 500 ?.
    Type: Grant
    Filed: February 13, 2004
    Date of Patent: January 16, 2007
    Assignees: ENI S.p.A., Enichem S.p.A., Enitecnologie S.p.A.
    Inventors: Angela Carati, Marco Tagliabue, Carlo Perego, Roberto Millini, Stefano Amarilli, Giuseppe Terzoni
  • Patent number: 7154015
    Abstract: Process for the production of propylene starting from mixtures of hydrocarbons, prevalently olefins, the above hydrocarbons having a boiling point ranging from ?15° C. to +80° C., preferably from ?12° C. to +60° C., which comprises putting the above mixture of hydrocarbons in contact, under cracking conditions, with a large-pore zeolite having a molar ratio Silica/Alumina lower than 200, preferably ranging from 50 to 150.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: December 26, 2006
    Assignees: Enichem S.p.A., Enitecnologie S.p.A.
    Inventors: Carlo Perego, Stefano Peratello, Paolo Pollesel, Sergio Sgorlon, Maria Angela Mantegazza, Massimo Romagnoli
  • Patent number: 7122501
    Abstract: A description follows of a bimetallic catalyst, obtained by dispersing in sequence and alternating the precursors of the single metal components of the catalyst on a carrier, and a process for the synthesis of hydrogen peroxide by the direct reaction of hydrogen with oxygen, in a solvent medium containing a halogenated promoter and an acid promoter, in the presence of said catalyst.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: October 17, 2006
    Assignees: Eni S.p.A., Enichem S.p.A.
    Inventors: Giuseppe Paparatto, Rino D'Aloisio, Giordano De Alberti, Roberto Buzzoni
  • Patent number: 7074383
    Abstract: A process is described for the preparation of zeolitic catalysts in the form of microspheres, comprising zeolite and oligomeric silica, characterized by a high mechanical resistance. The process consists in subjecting to rapid drying the suspension, to which tetra-alkylorthosilicate is optionally added, resulting from the synthesis of zeolite by hydrothermal treatment at autogenous pressure of the reagent mixture containing tetra-alkylammoniumhydroxide as templating agent, and subjecting the product resulting from the drying to calcination.
    Type: Grant
    Filed: April 18, 2005
    Date of Patent: July 11, 2006
    Assignee: Enichem S.p.A.
    Inventors: Angela Carati, Giuseppe Bellussi, Maria Angela Mantegazza, Guido Petrini
  • Publication number: 20060122445
    Abstract: A highly selective process is described for preparing 2,6-dimethylnaphthalene which comprises reacting a naphthalene hydrocarbon selected from naphthalene, methylnaphthalenes, dimethylnaphthalenes, trimethylnaphthalenes, polymethylnaphthalenes, and/or their mixtures with one or more benzene hydrocarbons selected from benzene, toluene, xylenes, trimethylbenzenes, tetramethylbenzenes, pentamethylbenzene and/or hexamethylbenzene, under at least partially liquid phase conditions and in the presence of a catalytic composition comprising a zeolite belonging to the MTW structural type and at least one element selected from P, B and Si. The process is preferably carried out in the presence of a methylating agent.
    Type: Application
    Filed: January 18, 2006
    Publication date: June 8, 2006
    Applicants: ENICHEM S.p.A, ENI S.p.A., ENITECNOLOGIE S.p.A., ENITECNOLOGIE S.p.A.
    Inventors: Giannino Pazzuconi, Carlo Perego, Giuseppe Bellussi
  • Patent number: 7019186
    Abstract: A highly selective process is described for preparing 2,6-dimethylnaphthalene which comprises reacting a naphthalene hydrocarbon selected from naphthalene, methylnaphthalenes, dimethylnaphthalenes, trimethylnaphthalenes, polymethylnaphthalenes, and/or their mixtures with one or more benzene hydrocarbons selected from benzene, toluene, xylenes, trimethylbenzenes, tetramethylbenzenes, pentamethylbenzene and/or hexamethylbenzene, under at least partially liquid phase conditions and in the presence of a catalytic composition comprising a zeolite belonging to the MTW structural type and at least one element selected from P, B and Si. The process is preferably carried out in the presence of a methylating agent.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: March 28, 2006
    Assignees: Enichem S.p.A., ENI S.p.A., Enitecnologie S.p.A.
    Inventors: Giannino Pazzuconi, Carlo Perego, Giuseppe Bellussi
  • Patent number: 7018595
    Abstract: A process is described for the preparation of zeolitic catalysts in the form of microspheres, comprising zeolite and oligomeric silica, characterized by a high mechanical resistance. The process consists in subjecting to rapid drying the suspension, to which tetra-alkylorthosilicate is optionally added, resulting from the synthesis of zeolite by hydrothermal treatment at autogenous pressure of the reagent mixture containing tetra-alkylammoniumhydroxide as templating agent, and subjecting the product resulting from the drying to calcination.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: March 28, 2006
    Assignee: Enichem S.p.A.
    Inventors: Angela Carati, Giuseppe Bellussi, Maria Angela Mantegazza, Giudo Petrini
  • Publication number: 20050187096
    Abstract: A process is described for the preparation of zeolitic catalysts in the form of microspheres, comprising zeolite and oligomeric silica, characterized by a high mechanical resistance. The process consists in subjecting to rapid drying the suspension, to which tetra-alkylorthosilicate is optionally added, resulting from the synthesis of zeolite by hydrothermal treatment at autogenous pressure of the reagent mixture containing tetra-alkylammoniumhydroxide as templating agent, and subjecting the product resulting from the drying to calcination.
    Type: Application
    Filed: April 18, 2005
    Publication date: August 25, 2005
    Applicant: ENICHEM S.p.A.
    Inventors: Angela Carati, Giuseppe Bellussi, Maria Mantegazza, Giudo Petrini
  • Patent number: 6924247
    Abstract: The object of the present invention relates to a simple, rapid and inexpensive process for effecting solid-liquid separations in the case of zeolites, also having small crystals. This process, which is particularly useful for the recovery of zeolite crystals in suspension in the crystallization water, comprises treating this suspension of crystals with an acid or one of its precursors and subjecting the resulting mixture to filtration or decanting. According to a particular aspect of the invention, the crystalline phase is separated in a mixture with oxides which can be used as ligands. Said oxides can be generated by the reagents of the zeolite preparation reagent mixture, not transformed into crystalline phase during the synthesis hydrothermal treatment, or they can be added to the suspension of crystals before the separation treatment, or again they can be generated by precursors suitably added to the crystallization slurry.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: August 2, 2005
    Assignees: Eni S.p.A., Enichem S.p.A., Enitecnologie S.p.A.
    Inventors: Angela Carati, Giannino Pazzuconi, Carlo Perego, Oscar Cappellazzo, Gianni Girotti
  • Patent number: 6924406
    Abstract: A process for separating mixtures of hydrocarbon isomers on molecular sieves, including providing columns which include molecular sieves and function alternatively as secondary adsorption, primary adsorption, and desorption devices, feeding the mixtures of hydrocarbon isomers to a column functioning as the primary adsorption device for adsorbing isomers with greater selectivity towards the molecular sieves, feeding effluent of the mixtures from the column functioning as the primary adsorption device to a column functioning as the secondary adsorption device for adsorbing remaining isomers with greater selectivity, discharging isomers with a lower selectivity from the column functioning as the secondary adsorption device and a desorbing agent therein, feeding a desorbing agent to the column functioning as the desorption device, discharging isomers with a greater selectivity towards the molecular sieves and the desorbing agent in the column functioning as the desorption device.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: August 2, 2005
    Assignee: Enichem S.p.A.
    Inventors: Gianluca Girardi, Gianni Pandolfi, Renzo Bignazzi, Renato Paludetto
  • Patent number: 6867258
    Abstract: High transparency polymeric composition essentially consisting of: (1) from 30 to 95% of polystyrene; (2) from 70% to 5% of a composition of vinylarene-conjugated diene block copolymers; the percentage sum of (1) and (2) being equal to 100; the composition (2) consisting of: (2a) from 30 to 60% by weight of copolymers with a linear structure (2b) from 70% to 40% by weight of copolymers with a branched structure; the weight average molecular weight of the above composition (2) ranging from 30,000 to 400,000, preferably from 50,000 to 200,000.
    Type: Grant
    Filed: September 23, 2002
    Date of Patent: March 15, 2005
    Assignee: Enichem S.p.A.
    Inventors: Sergio Custro, Claudio Cavallo, Cristina Gobbi
  • Publication number: 20040236165
    Abstract: The present invention regards a catalytic composition comprising gallium, at least one element chosen in the group of the lanthanides, and a zeolite belonging to the MFI, MEL or MFI/MEL families, the crystal lattice of which is made up of silicon oxide and at least one metal oxide chosen from among aluminium oxide, boron oxide and gallium oxide. Preferably, in the catalytic compositions of the present invention a zeolite is used belonging to the MFI family characterized by crystallites which for at least 90% have diameters smaller than 500 Å and which can form agglomerates of submicron dimensions characterized by possessing at least 30% of the extrazeolitic porosity in the region of the mesopores.
    Type: Application
    Filed: February 13, 2004
    Publication date: November 25, 2004
    Applicants: ENI S.p.A., ENICHEM S.p.A, ENITECHNOLOGIE S.p.A.
    Inventors: Angela Carati, Marco Tagliabue, Carlo Perego, Roberto Millini, Stefano Amarilli, Giuseppe Terzoni
  • Patent number: 6784316
    Abstract: The invention relates to a purification method of cyclohexanone-oxime in a solution of solvents immiscible with water, which consists in washing said solutions with water or with an aqueous solution of a base having a pK<5 or in passing the solutions of cyclohexanone-oxime through a weakly alkaline ion exchange resin and, optionally, also through a weakly acid ion exchange resin.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: August 31, 2004
    Assignee: Enichem S.p.A.
    Inventors: Masami Fukao, Francesco Cainelli, Roberto Tessari, Piero Furlan
  • Patent number: 6780947
    Abstract: Organometallic complex having the formula (IAP)M(X)n which can be used for die formation of catalytic systems wherein: M is a metal selected from transition metals and lanthanides, in oxidation state “s” positive and different from zero; each X is independently a group of an anionic nature bound to the metal as an anion in an ionic couple or with a convalent bond of the “&sgr;” type; “n” expresses the number of X groups sufficient for neutralizing the formal “+s” charge of the metal M, and (IAP) represents a neutral bond consisting of a mono-imine of 2,6-diacylpyridine. Said complex is prepared with relatively simple methods and can be used, combined with a suitable co-catalyst, such as for example, an aluminoxane, as a catalyst in normal (co)polymerization processes of &agr;-olefins, and especially ethylene.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: August 24, 2004
    Assignee: Enichem S.p.A.
    Inventors: Anna Sommazzi, Barbara Milani, Antonio Proto, Gianni Corso, Giovanni Mestroni, Francesco Masi
  • Patent number: 6737558
    Abstract: Process for the separation of 2,6-dimethylnaphthalene from mixtures containing it, comprising the following operations: crystallization by the addition of a solvent and cooling of the mixture to a temperature higher than the formation value of the first eutectic; removal of the mother liquor by repeated washings; dissolution of the solid obtained; crystallization by cooling; filtration.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: May 18, 2004
    Assignees: ENICHEM S.p.A., ENI S.p.A.
    Inventors: Renzo Bignazzi, Gianni Pandolfi
  • Patent number: 6734323
    Abstract: The present invention relates to a process for the preparation of zeolitic catalysts comprising zeolite and oligomeric silica, which can be used in industrial reactors. The process consists in directly mixing the suspension, resulting from the synthesis of the zeolite, with an oligomeric silica sol, obtained from the hydrolysis of a tetra-alkyl ortho silicate in the presence of tetra-alkylammonium hydroxide, and in subjecting the mixture to rapid drying, by feeding to a spray-dry.
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: May 11, 2004
    Assignees: Enichem S.P.A., Enitecnologie S.P.A.
    Inventors: Giuseppe Botti, Angela Carati, Leonardo Dalloro