Abstract
An equilibrium still with transparent static cell was constructed which enables the measurement of phase equilibria to be made at pressures up to the critical pressure. It was tested by vapour pressure measurement of pure n-butane within the temperature range 293–363 K. The vapour-liquid equilibria in the ethane- n-butane system were measured isothermally at 303.15, 323.15, 343.17, and 363.40 K. An interaction parameter in the mixing rule used in the Redlich-Kwong-Soave correlation method was evaluated.
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