Modified Ebulliometer for the Accurate Determination of Vapour-Liquid Equilibrium

The modification of the Swietoslawski ebulliometer for the accurate determination of vapour liquid equilibrium at pressures between 5 and 300 kPa and temperatures from 300 to 500 K is described. The measurements can be performed with or without the determination of the composition (at very low and the whole range of concentrations) of the liquid and vapour phases at equilibrium. The accuracy of results obtained is limited only by the purity of the substances used and by the precision of weighing and introduction of the samples into the ebulliometer. The performance of the proposed modified ebulliometer has been checked on the five different in their nature pure substances: n-hexane, cyclohexane, acetone, methanol, water and one binary, very difficult for measurement mixture of acetone and methanol.