Abstract
Schrage J., 1991. Vapor-liquid equilibrium of the system H 2SO 4-SO 3. Part I. Vapor pressure measurements with a new static vapor pressure apparatus. Fluid Phase Equilibria, 68: 229-245. A static vapor pressure apparatus is described suitable for determining the vapor pressure of extremely corrosive substances in the temperature range 20–350 °C and a pressure range of 0.1–160 bar. Measurements of the vapor pressure of water indicate a low measuring error in the pressure range over 1 bar (typical 0.5%) which increases slightly at pressures lower than 1 bar. With this equipment vapor pressures of H 2SO 4-SO 3 mixtures (oleum) and of pure sulfur trioxide have been determined. Values in the pressure range of 0.1–86 bar cover the whole concentration range of oleum. Each series of data has been approximated with a four-parameter vapor pressure equation. The measured values are in good accordance with the reliable literature data. For sulfur trioxide coefficients of the Wagner equation have been determined. The vapor pressure is described from the melting point to the critical point. The comparison with the literature data indicates a good quality of the experimental data and the adjusted vapor pressure equation.
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