Ausimont S.p.a.

Montedison S.p.a.

Solvay Solexis S.p.a.

Montecatini Edison S.p.a.

Giampiero Basile

Ezio Musso

Sauro Girolomoni

Giancarlo Boero

Mario Visca

Ugo Montiglio

Pierfrancesco Aspes

Elio Gallinotti

Claudio Tonelli

Franco Montino

Carlo Scotti

Emiliano M Ceresa

Giampaolo Solinas

Near-azeotropic ternary compositions of hydrofluorocarbons with n-butane or isobutane selected from: Said compositions have zero ODP, very low GWP and good solvent power for mineral lubricants. They are utilizable as drop-in substituents of R-12 in domestic refrigeration.

Near-azeotropic ternary compositions constituted by hydrogenated fluorocarbons and hydrocarbons, suitable as refrigerating fluids

Use as foaming agents having a low environmental impact of azeotropic or near azeotropic compositions using difluoromethoxy-bis(difluoromethyl ether) and/or 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether.

Foaming compositions

Foaming agents

Azeotropic or near azeotropic solvent compositions, based on 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether, essentially consisting of (% by weight):

Solvent compositions

Refrigerating compositions based on fluoroethers and difluoromethane

Azeotropic or near azeotropic compositions based on difluoromethoxy-bis(difluoromethyl ether) and/or 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether.

Hydrofluoropolyether-based azeotropic or near azeotropic compositions

Azeotropic or near azeotropic compositions based on hexafluoropropane (R 236) as substitutes of CClF,-CClF,(R 114) which essentially consist of R 236 and bis(difluoromethyl)-ether or n-butane, or mixtures thereof, for heat pumps, air-conditioners, etc.

Refrigerating compositions based on hexafluoropropane, fluoroethers and hydrocarbons

Use of near-azeotropic mixtures of hydrofluorocarbons with butane or isobutane selected from:

Near-azeotropic compositions constituted by hydrogenated fluorocarbons

Azeotrope-like mixtures, utilizable as refrigerating fluids in substitution of R-12 or R-502, constituted by hydrogen-(chloro)fluorocarbons, optionally in admixture with propane, cyclopropane or dimethylether.

Azeotrope-like mixtures utilizable as refrigerating fluids

The invention relates to a process for separating HF contained in liquid mixtures comprising HCFC 123 and/or 124. The mixtures, enriched in C.sub.2 Cl.sub.4 up to a content of such compound of 20-75% by weight, is subjected to a treatment for separating liquid phases, thereby obtaining an acid phase very rich in Hf and an organic phase impoverished in HF, which is subjected to a flash, so obtaining a liquid phase containing 123, 124 and C.sub.2 Cl.sub.4, having a very low HF content, and a gas phase enriched in HF. As an alternative to flash, a separation in a distillation column can be carried out.

Process for separating HF from its mixtures with

Nearly azeotropic compositions consisting of hydrogenated fluorocarbons, suitable as freezing mixture in conditioning plants, essentially consisting of:

Compositions consisting of hydrogenated fluorocarbons

The invention relates to a method for inhibiting the degradation by dehydrohalogenation of hydrochlorofluorocarbons, such as for example the mixture of 123 and 123a, used as foaming agents during the formation reaction of foamed polyurethanes or polyisocyanurates starting from polyols and polyisocyanates. Prior to the reaction starting, a little amount of a stabilizing substance selected from the group consisting of nitromethane, nitroethane and 1-nitropropane is added to the reaction medium.

Method for inhibiting the degradation of hydrochlorofluorocarbons

This invention relates to a process for stabilizing ferromagnetic chromium dioxide in respect of water and oxidizable organic compounds which it may contact in magnetic tapes. The process is applicable to a starting CrO.sub.2 having good magnetic properties, i.e. a coercive force not lower than about 400 Oersted, a maximum magnetic induction B.sub.m not lower than about 2500 gauss, and a magnetic induction B.sub.r not lower than about 1600 gauss. The CrO.sub.2 is subjected to a heat treatment at a temperature ranging from 300.degree. to 390.degree. C. in the presence of a gas stream not exerting any oxidizing or reducing action on the compounds of trivalent, tetravalent and hexavalent chromium. Suitable gases are, for example, nitrogen, helium and argon.

Process for stabilizing ferromagnetic chromium dioxide

A ferromagnetic chromium dioxide stabilized by coating the particles thereof with a stabilizing substance is disclosed, wherein the stabilizing substance consists essentially of an equimolecular mixture of Fe.sub.2 O.sub.3 and MnO or of a mixture of ferrite MeFe.sub.2 O.sub.4 with oxides Fe.sub.2 O.sub.3 and MeO, wherein Me represents Cu, Co, Zn or Mg and wherein the molar ratio Fe.sub.2 O.sub.3 /MeO is equal to 1, the quantity of the ferrite in the mixture being such as results from calcining, at temperature between 250.degree. and 350.degree. C., equimolecular quantities of Fe.sub.2 O.sub.3 and MeO. A process for obtaining the stabilized CrO.sub.2 is also disclosed wherein the CrO.sub.2 is dispersed in water and on it are co-precipitated Fe(OH).sub.3 and Mn(OH).sub.2 or Me(OH).sub.2 in stoichiometric quantities with respect to each other; after which the CrO.sub.2, in admixture with the hydroxides, is separated from the water, dried at a temperature not exceeding 100.degree. C. and then calcined at temperatures between 250.degree. and 350.degree. C.

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Alessandria, Italy

Giampiero Basile