5 documents found, page 1 of 1
CO2+Methanol+Glycerol : multiphase behaviour
Carrera, Gonçalo V. S. M.; Visak, Zoran P.; Lukasik, Rafal M.; Ponte, Manuel NunesABSTRACT: The phase behaviour of the system CO2+methanol+glycerol has been studied at low concentrations of this trialcohol. The synthetic method was implemented in a visual sapphire cell. New phase diagrams were obtained at temperatures of 313.15 and 333.15 K. Different methanol/glycerol molar ratios of 113, 50 and 30 were considered and its influence on phase behaviour accounted for. Pressures were varied fro...
CO2+Methanol+Glycerol : multiphase behaviour
Carrera, Gonçalo V. S. M.; Visak, Zoran P.; Lukasik, Rafal M.; Ponte, Manuel NunesABSTRACT: The phase behaviour of the system CO2+methanol+glycerol has been studied at low concentrations of this trialcohol. The synthetic method was implemented in a visual sapphire cell. New phase diagrams were obtained at temperatures of 313.15 and 333.15 K. Different methanol/glycerol molar ratios of 113, 50 and 30 were considered and its influence on phase behaviour accounted for. Pressures were varied fro...
Electrolytic conductivity of four imidazolium-based ionic liquids
Calado, Marta; Diogo, João C. F.; Mata, José L. Correia da; Caetano, Fernando J. P.; Visak, Zoran P.; Fareleira, João M. N. A.In this article, electrolytic (ionic) conductivity measurements of four ionic liquids (ILs), namely, 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide ([C2mim][NTf2]), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([C2mim][OTf]), 1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C6mim][NTf2]), and 1-ethyl-3-methylimidazolium ethyl sulfate ([C2mim][EtSO4]) (ECOENG212 ), wer...
Volumetric properties and spectroscopic studies of pyridine or nicotine solutio...
Visak, Zoran P.; Ilharco, Laura; Garcia, Ana Rosa; Najdanovic-Visak, Vesna; Fareleira, João M. N. A.; Caetano, Fernando J. P.; Kijevcanin, MirjanaDensities and molar excess volumes of the solutions of pyridine or nicotine in liquid polyethylene glycol, PEG200 and PEG400, have been determined at several temperatures. The experimental molar excess volumes are negative, thus indicating strong attractive interactions between the components, as could be expected considering their highly polar nature and good hydrogen bond abilities. For the pyridine systems, ...
Densities and Viscosities of the Ternary Mixtures Water + Butyl Acetate + Metha...
Visak, Zoran P.; Ferreira, Abel G. M.; Fonseca, Isabel M. A.The excess molar volumes, VE, and viscosity deviations, Δη, were calculated from the measured density and viscosity values over the whole miscibility composition ranges for the ternary systems water + butyl acetate + methanol and water + ethyl propionate + methanol and their constituent binaries, at 303.15 K and atmospheric pressure. A Redlich−Kister type equation was used to correlate binary VE and Δη data, as...