Enichem S.p.a

Montedison S.p.a.

Polimeri Europa S.p.a.

Other

Eniricerche S.p.a.

Montefluous S.p.a.

Luigi Balducci

Raffaele Ungarelli

Massimo Rustioni

Roberto Buzzoni

Leonardo Dalloro

Alberto Cesana

Daniele Bianchi

Maria Angela Mantegazza

Franco Rivetti

Fabio Garbassi

Giordano De Alberti

Giorgio Bottaccio

Camillo Paffoni

Paolo Chiurlo

Roberto Bagatin

Cristina Tonini

Dino Sarti

Fausto Gerelli

Marcello Pieroni

The present invention relates to a process for the preparation of zeolitic catalysts of the MFI type in spheroidal form. The process consists in emulsifying and consolidating in paraffinic hydrocarbons, in the presence of a non-ionic surface-active agent or a suitable combination of a non-ionic surface-active agent and a cationic surface-active agent, a dispersion of particles of zeolitic material of the MFI type in a silica sol.

Process for the preparation of MFI-type zeolitic catalysts

A process is described for regenerating exhausted zeolitic catalysts containing titanium and deriving from oxidation processes of organic substrates with hydrogen peroxide. Said process consists in carrying out a treatment in an aqueous medium with hydrogen peroxide in the presence of inorganic fluorinated compounds, subsequent to thermal treatment of the exhausted catalyst.

Process for the regeneration of zeolitic catalysts containing titanium

The present invention relates to a process for the preparation of catalysts suitable for the transposition reaction of oximes to amides. The process consists in englobing submicronic particles of MFI-type zeolites in a siliceous ligand substantially inactive in the above reactions.

Process for the preparation of catalysts based on MFI-type zeolite

A method is described for improving the catalytic performances of titanium silicalite having formula (I) by the activation of the catalyst (I) in an aqueous medium with hydrogen peroxide, in the presence of precursors of fluoride ions or anionic species containing fluorine. The activated catalyst (I) is particularly useful in oxidation processes with hydrogen peroxide of organic substrates and, in particular, in hydroxylation reactions of aromatic compounds, amoximation reactions of carbonyl compounds, epoxidation reactions of olefinic compounds and oxidation reactions of nitrogenated compounds.

Activation method of titanium silicalite

An improved process is described for the synthesis of hydroxylated aromatic compounds by means of the oxidation of an aromatic substrate with hydrogen, peroxide in an organic solvent, in the presence of synthetic zeolites, wherein the improvement consists in the fact that the organic solvent is selected from compounds having general formula (I) ##STR1## wherein: R.sub.1, R.sub.2, R.sub.3 and R.sub.4, the same or different, represent a hydrogen atom or an alkyl group with from 1 to 4 carbon atoms or from compounds having general formula (II) ##STR2## wherein R and R', the same or different, represent an alkyl radical with from 1 to 4 carbon atoms.

Process for the oxidation of aromatic compounds to hydroxyaromatic

Process for preparing porous spherical silica particles substantially consisting in emulsifying an acidic silica sol in a dispersing media, gelifying the microdrops of the sol in the emulsified state and submitting the resulting gel to thermal treatment in the presence of the emulsifier liquid and of sol gelation base.

Process for preparing porous spherical silica xerogels

The present invention relates to silica/zeolite composite materials in spherical form and the process for their preparation which occurs by the dispersion of submicronic particles of titanium silicalite, beta zeolite, or mixtures of beta zeolite with titanium silicalite, in a silica sol synthesized by acid hydrolysis of silicon alkoxides; the hybrid sol thus obtained, subjected to emulsification and gelation techniques in organic mediums, produces these materials in a spherical form with an average diameter of between 20 and 150 .mu.m and containing up to 70% by weight of titanium silicalite, beta zeolite or mixtures of titanium silicalite/beta zeolite. The materials of the invention, having a high mechanical resistance and characterized by a surface area of between 300 and 800 m.sup.2 /g, are applied as catalysts; in particular, those consisting of titanium silicalite or mixtures of titanium silicalite/beta zeolite are advantageously used in oxidation reactions of organic compounds with hydrogen peroxide.

Silica/zeolite composite materials in spherical form and process for

A process for the preparation of mixed silica-zirconia sols and mixed oxides in spherical form, comprising mixing a silicon alkoxide with a solution of an inorganic zirconium salt in a low molecular weight polyol and subjecting the intermediate thus formed to acid hydrolysis in a water medium.

Process for the preparation of mixed silica-zirconia sols and mixed

The present invention relates to a process for the preparation of mixed porous oxides with a spherical morphology and the oxides themselves thus obtained. This process consists in emulsifying, in an acid environment, a mixed sol with a dispersing medium, gelifying the microemulsion thus formed by contact with an alkaline solution and subjecting the gel obtained to thermal aging in the presence of the emulsifying liquid and gelation base of the sol or in a water medium, under controlled conditions of pH and temperature. The above mixed oxides can be widely applied as carriers for catalysts or as precursors of ceramic materials.

Process for the preparation of mixed porous silica-alumina oxides in a

Novel composite pigments containing both organic and inorganic portions have been produced. These pigments consist of an inorganic binary titanium dioxide/aluminum hydrate component, in a percent quantity comprised between 70% and 95% by weight, the remaining organic component amounting to between 5% and 30% by weight, consisting of an organic dye selected from the group consisting of azoic and quinophtalonic compounds, containing in their structure at least one carboxylic and/or sulphonic, substantially salified, acid function. The pigments are obtained according to a co-precipitation process, under substantially alkaline controlled pH conditions, of the acid organic dye together with the aluminum hydroxide (hydrated aluminum), by acidification of a solution and/or an aqueous dispersion of the acid organic dye in sodium aluminate, in the presence of titanium dioxide, at from 40.degree. C. to about 80.degree. C., and by a subsequent lacquering by treatment with an aqueous solution of an alkaline-earth metal salt (Ca, Mg, Ba, Sr) or of a Mn, Zn salt. The above-mentioned pigments are insoluble in water and in common organic solvents. They possess, moreover, a good dyeing power, an excellent stability under heat, a good fastness to light, a good fastness to bases and acids, to migration in plastic materials and stability to over varnishing in the stove, etc. Lastly, they may be obtained with different degrees of covering power. Thus, the pigments find a preferential application in varnishing products, air-drying and stove-baked enamels, in the pigmentation of plastic materials, in inks and in the beprinting of fabrics, etc., by means of conventional applicational methods.

Composite pigments and process for their preparation

This invention relates to new inorganic pigments consisting or consisting essentially of a TiO.sub.2 rutile nucleus, of a first adherent coating of trigonal Al.sub.2 O.sub.3 and of a second adherent coating of cubic MeAl.sub.2 O.sub.4, in which Me is Co, Ni, Cu, Zn or Mg. These pigments are obtained by mixing TiO.sub.2 rutile particles coated with Al.sub.2 O.sub.3, with a MeO oxide or a Me compound capable of providing MeO in a subsequent calcination step, and by calcining the mixture in the presence of air at temperatures in the range of from 750.degree. to 1000.degree. C.

Rutile (TiO.sub.2) pigments coated with (1) trigonal anhydrous alumina

This invention relates to new inorganic yellow pigments consisting or consisting essentially of Bi.sub.1-(x/3) M.sub.x V.sub.1-x O.sub.4 in which M is Mo or W. The value of x varies from 0.075 to 0.317 in the case of Mo and from 0.059 to 0.265 in the case of W. These pigments are composed of only the tetragonal crystalline phase of the scheelite type when M is Mo; when M is W, also the orthorhombic crystalline phase .gamma.Bi.sub.2 WO.sub.6 is present. These pigments may also contain a crystalline phase consisting of orthorhombic BaSO.sub.4 ; in such case the amount of BaSO.sub.4 may reach 80% by weight of the pigment.

Molybdenum or tungsten containing bismuth vanadate yellow pigments and

The present invention concerns new inorganic pigments and a process for their preparation. More particularly, it relates to new bismuth vanadate based yellow pigments. The pigments of this invention include orthorhombic barium sulphate as a diluent, said diluent being in an amount comprised between 10 and 90% by weight of the total composition.

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Mortara, Italy

Luigi Balducci