ISOTHERMAL VAPOR-LIQUID-EQUILIBRIUM FOR DIMETHYL ETHER + SULFUR-DIOXIDE

Vapor-liquid equilibrium conditions (p - T - x - y) of the binary mixture dimethyl ether (DME) + sulfur dioxide (SO2) have been measured along seven isotherms (three subcritical and four supercritical). The mixture forms a negative (maximum boiling) azeotrope which persists to the critical line. The maximum likelihood method has been used to test the thermodynamic consistency of the three subcritical isotherms. The ability of a modified van der Waals equation of state to model the data is demonstrated. Brief descriptions of the apparatus and data reduction procedure are given.