Abstract
Vapor pressure measurements of the two binary systems sulfur dioxide-ethanol and sulfur dioxide-diethyl ether at 20°C were made over the entire range of composition. For the latter system negative deviations from Raoult''s law were observed, while for the former system there were small positive deviations in the experimental region. Measurements of UV-spectrum of these systems in n-heptane were also made at 10 and 25°C, from which the constants for complex formation were calculated. For the sulfur dioxide-diethyl ether system the 1 :1 complex formation model represents well both thermodynamic and UV-spectral data. For the sulfur dioxide-ethanol system two types of continuous linear association model, AiBj and AiBj, have been applied to analyze the data. The results show that the AiBj model represents the activity coefficients better than the AiBj model, while the AiBj model is better for the UV-spectral data.
