Solubility for dilute sulfur dioxide in binary mixtures of N,N-dimethylformamide plus Ethylene Glycol at T=308.15 K and p=122.66 kPa

In this work, isothermal (gas + liquid) equilibrium (GLE) data were measured for the system SO2 + N-2 + N,N-dimethylformamide (DMF) + Ethylene Glycol (EG) at T = 308.15 K and p = 122.66 kPa. Based on these data, Henry's law constants were obtained by fitting the linear slope of the GLE data. The results show the solubility of dilute SO2 in the DMF + EG solutions increases with the increasing DMF concentration, and the solubility values range from 2.38 mol . m(-3) (pure EG) to 47.2 mol . m(-3) (pure DMF) when SO2 concentration in the gas phase is designed at Phi(SO2) = 5 . 10(-4). Meanwhile, the densities, rho, and viscosities, nu, for the binary mixtures of DMF + EG were measured over the whole concentration range at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K. The experimental results were compared with reported data in literatures. From the experimental density and viscosity data, the excess molar volumes, V-m(E), and viscosity deviations, Delta nu, were calculated and the calculated results were fitted to a Redlich-Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of V-m(E) and Delta nu are shown to be negative at all experimental temperatures and compositions. From the kinematic viscosity data, Gibbs energies of activation of viscous flow (Delta G*), enthalpy of activation for viscous flow (Delta H*) and entropy of activation for the viscous flow (Delta S*) were also calculated. Crown Copyright (c) 2013 Published by Elsevier Ltd. All rights reserved.