Abstract: Catalyst for steam cracking reactions consisting of pure mayenite having the general formula:
12CaO.7Al2O3
having an X-ray diffraction spectrum as indicated in Table I, obtained with a preparation process comprising the following steps:
dissolution of salts containing calcium and aluminum with water;
complexing of the dissolved salts by means of polyfunctional organic hydroxyacids;
drying of the solution resulting from the completing in order to obtain a solid precursor product;
calcination of the solid precursor product at a temperature ranging from 1300 to 1400° C. for at least two hours.
Type:
Grant
Filed:
December 4, 2002
Date of Patent:
February 24, 2004
Assignees:
ENICHEM S.p.A., ENITECNOLOGIE S.p.A.
Inventors:
Paolo Pollesel, Caterina Rizzo, Carlo Perego, Renato Paludetto, Gastone Del Piero
Abstract: A process is described for the continuous production of alcoholic or hydro-alcoholic solutions of hydrogen peroxide in a concentration ranging from 2 to 10% by weight and their direct use in oxidation processes.
The process operates under high safety conditions and with a high productivity and molar selectivity towards the formation of H2O2.
Type:
Grant
Filed:
June 1, 2001
Date of Patent:
November 18, 2003
Assignees:
Eni S.p.A., Enichem S.p.A.
Inventors:
Giuseppe Paparatto, Franco Rivetti, Pietro Andrigo, Giordano De Alberti
Abstract: The present invention relates to a method for the removal of the templating agent from synthetic zeolites in general and in particular from silicalite, titanium silicalite and from composite materials containing zeolites and for their activation as catalysts.
The method consists in treating the above materials with solvents in vapor phase and at a low temperature.
Abstract: A bimetallic catalyst is obtained by dispersing, in sequence and alternating, the precursors of the single metal components of the catalyst on a carrier. 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 the bimetallic catalyst.
Type:
Grant
Filed:
June 1, 2001
Date of Patent:
October 7, 2003
Assignees:
Eni S.p.A., Enichem S.p.A.
Inventors:
Giuseppe Paparatto, Rino D'Aloisio, Giordano De Alberti, Roberto Buzzoni
Abstract: Thermoplastic compositions are disclosed based on syndiotactic polymers of styrene, reinforced with rigid fillers, comprising: a) a crystalline syndiotactic polymer of styrene; b) a polyarylene-ether; c) 1-200 parts by weight, with respect to 100 parts of (a)+(b), one or more inorganic and/or organic rigid fillers; and d) a silanic compound with a compatibilizing function.
Type:
Grant
Filed:
November 30, 1998
Date of Patent:
September 2, 2003
Assignee:
Enichem S.p.A.
Inventors:
Raffaele Franco, Alessandro Moro, Marco Scapin, Riccardo Po′
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:
February 4, 2003
Publication date:
July 31, 2003
Applicant:
ENICHEM S.p.A.
Inventors:
Giannino Pazzuconi, Carlo Perego, Giuseppe Bellussi
Abstract: An organometallic composition of a reaction product of a fluorinated organic compound of formula (I):
wherein R1 to R8 are as described in the specification, m is 0 or 1; and an organometallic compound of formula (II):
M′RnX(p−n) (II)
wherein M′, R, X, n and p are as described in the specification; a polymerization catalyst composition using the above organometallic composition and a metallocene complex a method of making the catalyst composition and using the catalyst composition to polymerize &agr;-olefins.
Type:
Grant
Filed:
December 16, 1999
Date of Patent:
July 22, 2003
Assignee:
Enichem S.p.A.
Inventors:
Anna Sommazzi, Francesco Masi, Giampietro Borsotti, Antonio Proto, Roberto Santi
Abstract: Catalytic system for the oxidative dehydrogenation of alkylaromatics (in particular ethylbenzene) or paraffins to the corresponding alkenylaromatics (in particular styrene) or to the corresponding olefins, consisting of:
a vanadium oxide;
a bismuth oxide;
and a carrier based on magnesium,
wherein the vanadium, expressed as V2O5, is in a quantity ranging from 1 to 15% by weight, preferably from 2 to 10%, the bismuth, expressed as Bi2O3, ranges from 2 to 30% by weight, preferably from 5 to 25% by weight, the complement to 100 being the carrier.
Type:
Grant
Filed:
June 5, 2000
Date of Patent:
July 1, 2003
Assignees:
Enichem S.p.A., EniTecnologie S.p.A.
Inventors:
Patrizia Ingallina, Luciano Carluccio, Giuseppe Bellussi, Gastone Del Piero, Eugenio Andreoli, Renato Paludetto
Abstract: Process for the polymerization of unsaturated vinyl and/or vinylidene monomers which comprises reacting one or more monomers in the presence of heterocyclic initiators having a nitrogen atom bound to an oxygen atom at a temperature ranging from 100 to 130° C.
Type:
Grant
Filed:
May 11, 2001
Date of Patent:
June 10, 2003
Assignee:
Enichem S.p.A.
Inventors:
Nicoletta Cardi, Riccardo Po', Giuliana Schimperna, Maria Caldararo, Maria Anna Cardaci, Fabio Garbassi
Abstract: The invention relates to the use of organic carbonates having formula (I)
wherein:
n=1-4
R and R′ are two linear or branched alkyl radicals which contain a number of carbon atoms whose sum is equal to at least 5 and which can be the same or different, as solvents for the washing of metal surfaces.
Abstract: An optical article, which is a preform for an optical lens, which is isotropic, consisting essentially of silicon oxide or silicon oxide in combination with one or more oxides of elements belonging to Groups III to VI of the Periodic Table,
the article having a dimensional precision which has tolerance to surface roughness and profilometric accuracy required in the spectral interval of 200-800 nm of the electromagnetic spectrum,
the tolerance being between one-half and one-tenth wavelength corresponding to the range of about 0.350-0.02 &mgr;m.
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:
December 10, 2002
Publication date:
May 1, 2003
Applicant:
ENICHEM S.p.A
Inventors:
Angela Carati, Giuseppe Bellussi, Maria Angela Mantegazza, Giudo Petrini
Abstract: Process for preparing catalytic systems consisting of:
a vanadium oxide;
a bismuth oxide;
and a carrier consisting of magnesium oxide, comprising:
preparing of solutions based on derivatives of the components of the catalytic system;
mixing the solutions and optional aging;
drying the solution;
first heating, in the presence of air, of the solid obtained from the drying at a temperature ranging from room value to a temperature of between 290 and 310° C., for a time ranging from 1 to 3 hours;
additional heating, in the presence of air, of the solid for a time ranging from 2 to 4 hours at the calcination temperature ranging from 600 to 850° C.;
calcination, in the presence of air, of the solid at a constant temperature, ranging from 600 to 850° C., reached in the additional heating, for a time ranging from 8 to 16 hours.
Type:
Grant
Filed:
June 1, 2001
Date of Patent:
March 11, 2003
Assignees:
Enichem S.p.A., Enitecnologie S.p.A.
Inventors:
Patrizia Ingallina, Luciano Carluccio, Carlo Perego, Gastone Del Piero, Fabio Assandri
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:
September 24, 1998
Date of Patent:
February 25, 2003
Assignee:
Enichem S.p.A.
Inventors:
Angela Carati, Giuseppe Bellussi, Maria Angela Mantegazza, Giudo Petrini
Abstract: Process for the alkylation of aromatic compounds by the reaction of the aromatic compound of interest with isopropanol, alone or mixed with propylene, wherein the reaction is carried out in the presence of a catalytic composition based on zeolite, under mixed gas-liquid phase conditions or under completely liquid phase conditions, at such temperature and pressures that the concentration of water in the reaction liquid phase is not higher than 8,000 ppm w/w, regardless of the total water content present in the reaction mixture.
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:
Application
Filed:
June 27, 2002
Publication date:
January 16, 2003
Applicant:
ENICHEM S.p.A.
Inventors:
Masami Fukao, Francesco Cainelli, Roberto Tessari, Piero Furlan
Abstract: Vanadium complex having general formula (I)
(RCOO)nVXpLm (I)
wherein R is a monofunctional hydrocarbon radical having from 1 to 20 carbon atoms and from 1 to 6 halogen atoms, selected from chlorine and bromine, preferably chlorine; X is chlorine or bromine, preferably chlorine; L is an electron donor; p+n=3, 4 or 5, preferably=3; n is greater than or equal to 1; m is between 0 and 3. The preparation of the above complex is also described together with its use in the (co)polymerization of &agr;-olefins.
Type:
Grant
Filed:
November 18, 1999
Date of Patent:
December 17, 2002
Assignee:
Enichem S.p.A.
Inventors:
Francesco Masi, Liliana Gila, Roberto Santi, Antonio Proto, Evelina Ballato, Anna Maria Romano
Abstract: A process is described for the preparation of compounds having the formula (I) C6F4HX, wherein X is Br or Cl, which comprises reacting tetrafluorobenzene with a halogen in the presence of a Lewis acid catalyst.
Type:
Grant
Filed:
December 12, 2001
Date of Patent:
December 10, 2002
Assignee:
Enichem S.p.A.
Inventors:
Giampietro Borsotti, Anna Sommazzi, Roberto Santi