Abstract
AbstractA new pressure controlled twin‐ebulliometer without Cottrell‐pump is described. The boiling temperature can be chosen by setting the pressure by means of a pressure regulator in the range of 100 – 760 Torr. Measurements of polystyrene and other polymers show that in this rotation ebulliometer foaming is no more effective. This fact and the agreement of the experimental ideal ebullioscopic constant with those calculated mean that thermodynamic equilibrium between vapour and liquid may be established in the rotation ebulliometer. ‐ The systems diphenyl + benzene and benzil + benzene were investigated in a solute mole fraction between 0.01 and 0.04 at various temperatures (30–80 °C). The activity coefficients of benzene in the diphenyl + benzene system at 65 °C were compared with those obtained from vapour pressure measurements in more concentrated solutions. The experimental data can all be fitted by the Guggenheim's equation with r = 2, z = 6, and zw/k = 76°. The data in the benzil + benzene system at 65°C can be represented by the same equation with zw/k = 200°, which agrees with the value obtained by calorimetric determinations of the heats of dilution.
Published Version
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