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

Abstract

In this work, isothermal (gas+liquid) equilibrium (GLE) data were measured for the system SO2+N2+N,N-dimethylformamide (DMF)+Ethylene Glycol (EG) at T=308.15K and p=122.66kPa. 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 47.2mol·m−3 (pure DMF) when SO2 concentration in the gas phase is designed at ΦSO2=5·10−4. Meanwhile, the densities, ρ, and viscosities, ν, 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, VmE, and viscosity deviations, Δν, 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 VmE and Δν are shown to be negative at all experimental temperatures and compositions. From the kinematic viscosity data, Gibbs energies of activation of viscous flow (ΔG∗), enthalpy of activation for viscous flow (ΔH∗) and entropy of activation for the viscous flow (ΔS∗) were also calculated.