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

Abstract: 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.

Abstract: Near-azeotropic ternary compositions of hydrofluorocarbons with n-butane or isobutane selected from: A) 1,1,1,2-tetrafluoroethane (R134a) 65-94% by weight pentafluoroethane (R125) 2-25% by weight n-butane (R600) and/or isobutane (R-600a) 1-10% by weight B) 1,1,1,2-tetrafluoroethane (R134a) 65-94% by weight 1,1,1,2,3,3,3-heptafluoropropane (R227ea) 5-25% by weight n-butane (R600) and/or isobutane (R-600a) 1-10% by weight 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.

Abstract: Hydrofluoropolyether foaming agents selected from: difluoromethoxy-bis(difluoromethyl ether) of formula HCF2OCF2OCF2H; and/or 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether of formula HCF2OCF2CF2OCF2H, and their use in polyurethane foams.

Abstract: Azeotropic or near azeotropic solvent compositions, based on 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether, essentially consisting of (% by weight): I) 1-difluoromethoxy 15-99 1,1,2,2-tetrafluoroethyl difluromethyl ether (HCF2OCF2CF2OCF2H); isopentane 85-1  II) 1-difluromethoxy 25-99 1,1,2,2-tetrafluroethyl difluoromethyl ether (HCF2OCF2CF2OCF2H); methyl-acetate 75-1  III) 1-difluoromethoxy 35-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF2OCF2CF2OCF2H); 1-bromo-propane  65-1.

Abstract: Azeotropic or near azeotropic solvent compositions, based on 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether, essentially consisting of (% by weight): 1   I) 1-difluoromethoxy 15-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF2OCF2CF2OCF2H); isopentane 85-1  II) 1-difluoromethoxy 25-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF2OCF2CF2OCF2H); methyl-acetate 75-1 III) 1-difluoromethoxy 35-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF2OCF2CF2OCF2H); 1-bromo-propane 65-1

Abstract: Azeotropic or near-azeotropic composition essentially consisting of: 35-99.1% by weight of CH2F2 (R 32), difluoromethane, 0.1-65% by weight of CHF2—O—CF3, 1,1,1,2,2,-pentafluorodimethylether.

Abstract: Azeotropic or near-azeotropic composition essentially consisting of:

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

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

Abstract: Azeotropic or near azeotropic compositions based on hexafluoropropane (R 236) as substitutes of CClF2-CClF2 (R 114) which essentially consist of R 236 and bis(difluoromethyl)-ether or n-butane, or mixtures thereof, for heat pumps, air-conditioners, etc.

Abstract: Use of near-azeotropic mixtures of hydrofluorocarbons with butane or isobutane selected from:A) 1,1,1,2-tetrafluoroethane (HFC-134a) 5-88% by wt1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) 12-95% by wtB) 1,1,1,2-tetrafluoroethane (HFC-134a) 10-87% by wt1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) 12-81% by wtn-butane 1-30% by wtC) 1,1,1,2-tetrafluoroethane (HFC-134a) 18-69% by wt1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea) 30-81% by wtisobutane 1-30% by wtas propellant fluids for aerosol.Said mixtures have zero ODP, very low GWP, no or low inflammability, insignificant pressure loss during the use and good solubility towards the typical solvents of aerosol formulations.

Abstract: 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.

Abstract: 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.

Abstract: Nearly azeotropic compositions consisting of hydrogenated fluorocarbons, suitable as freezing mixture in conditioning plants, essentially consisting of:(A) from 38 to 53% by weight of R22;(B) from 34 to 56% by weight of R124 and/or R124A;(C) from 2 to 13.5% by weight of R600 and/or R600A.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The present invention concerns a stabilized ferromagnetic chromium dioxide and a process for obtaining the same. More particularly, the present invention relates to ferromagnetic chromium dioxide stabilized by means of the coating of its particles with a stabilizing substance, characterized in that the stabilizing substance is selected from the group consisting of a zinc, aluminum or chromium (III) polyphosphates having a high molar ratio phosphorus/metal and having, depending on the metal, the following formula: P.sub.2 O.sub.5.nZnO.mH.sub.2 O wherein "n" in general is comprised between 0.286 and 0.667 while "m" is generally comprised between 0 and 2.570;P.sub.2 o.sub.5.nAl.sub.2 O.sub.3.mH.sub.2 O wherein "n" is in general comprised between 0.225 and 0.500, while "m" is generally comprised between 0 and 2.68;P.sub.2 o.sub.5.nCr.sub.2 O.sub.3.mH.sub.2 O wherein "n" is in general comprised between 0.143 and 0.333, while "m" is generally comprised between 0.002 and 2.46.

Abstract: Near-azeotropic ternary compositions of hydrofluorocarbons with n-butane or isobutane selected from: A) 1,1,1,2-tetrafluoroethane (R134a) 65-94% by weight pentafluoroethane (R125) 2-25% by weight n-butane (R600) and/or isobutane (R-600a) 1-10% by weight B) 1,1,1,2-tetrafluoroethane (R134a) 65-94% by weight 1,1,1,2,3,3,3-heptafluoropropane (R227ea) 5-25% by weight n-butane (R600) and/or isobutane (R-600a) 1-10% by weight 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.