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Liquid-liquid equilibrium data for the PEG 4000 + NaNO 3 + H 2 O system were measured at 298.15 K. The binodal curve was fitted to a three-parameter equation, and the tie line compositions were fitted to both the Othmer-Tobias and Bancroft equations. The refractive indices and densities of several homogeneous ternary solutions used for calibration were also measured in the range 0-40 mass % PEG, 0-18 mass % NaNO 3 .

Ozonolysis, as a lignocellulosic biomass pretreatment, goes back to 80s; however, in the last years it is becoming widespread again owing to its efficiency and mild operation conditions. Ozone reacts preferably with lignin than carbohydrates, promoting biomass destructuration and delignification, and so the sugar release by enzymatic hydrolysis.The hydrolysate from pretreated biomass has being used as sugars source for secondgeneration fuels production, mainly ethanol, methane and hydrogen. Short-chain carboxylic acids are the main inhibitory compounds generated, being properly removed by water washing. The most common inhibitory compounds reported for other pretreatments, furfural and HMF (5-hydroxymethylfurfural) † , are not found in ozonepretreated hydrolysates. Composition of pretreated biomass and ozone consumption depends on several process parameters: reactor design, moisture content, particle size, pH, reaction time, ozone/air flow and ozone concentration. Additional studies are necessary to clarify process parameters effect and to optimize the process to achieve high yields with economic feasibility.

Solubilities, densities, and refractive indices data have been measured for the ternary systems KCl + C2H5OH + H2O and NaCl + C2H5OH + H2O at (298.15 and 313.15) K, with mass fractions of ethanol ranging from 0 to 0.9. Polynomial equations of fit are proposed for solubility of the saturated solutions as a function of the mass fraction of ethanol. Density and refractive index were also determined for the same ternary systems with varied undersaturated salt concentrations. Values for both properties were correlated with the salt concentrations and proportions of alcohol in the solutions. The equations proposed also account for the saturated solutions. Finally, data are also presented on the equilibrium of the quaternary system KCl + NaCl + C2H5OH + H2O at (298.15 and 313.15) K. The solubility equilibrium was obtained beginning from supersaturated solutions of both salts using a known ethanol-to-water ratio. The concentrations, densities, and refractive indices were determined for the saturated solutions.