DETERMINATION OF SELECTIVITY AND MASS TRANSFER IN LIQUID-PHASE EXTRACTION FOR BUTYL GLYCOL-WATER-ISOPROPYL ETHER SYSTEM

The problems of phase equilibrium, the equilibrium distribution of a component between phases are considered, and the distribution coefficient is determined in two versions. A formula for determining the selectivity coefficient is obtained, equations relating the compositions of coexisting phases, by equating the activities in these phases, Margules constants are found. Based on the given content of the components, the numerical values of (Margules constant for A component in solvent S) and (Margules constant for S component in solvent A) were found Using the Margules equation for ternary systems, the activity coefficients of components A and B are determined in two phases. The experimentally obtained values of the molar fractions of each of the three components, responsible to different points of the binodal curve, the corresponding activity coefficients of component B, and also calculated on these coefficients of the activity values

Prediction of Melting of Organic Phase Change Materials (PCMs) for Energy Storage with Simple Low Eutectic Systems

The paper predicts the melting of solid-liquid organic PCMs for energy storage by the use of activity coefficient. Single parameter Margules Equation was built for alcohol - carboxylic acid series of binary systems by improving single parameter Margules Equation and introducing new variable temperatures, from which T-X phase diagram was obtained. The results are helpful with prediction of multiple phase change materials with the suitable phase transition temperature.

Two-phase equilibrium in binary and ternary systems VIII. The integral flash latent heat at constant pressure of the system ethylene-carbon dioxide

A method of determining the integral flash latent heat of a binary mixture at constant pressure is described and results are given for the system ethylene-carbon dioxide. The experimental results are compared with those calculated from the Duhem-Margules equation.

VAPOUR PRESSURES AND BOILING POINTS OF BINARY MIXTURES OF HYDROGEN PEROXIDE AND WATER

The total vapour pressures of binary mixtures of hydrogen peroxide and water have been measured by means of the static method at 30, 45, and 60 °C. over the entire range of concentration. The vapour-pressure–composition curves have been found to exhibit large negative deviations from Raoult's law, but no minimum. A special apparatus and experimental technique were devised that enabled the composition of the vapour to be determined in each case. These data were used to obtain the partial pressures of both components. The values thus found are in good agreement with those calculated from the total vapour pressures by means of the Duhem Margules equation. The activities of water and hydrogen peroxide in their solutions have been calculated and interpreted on the basis of the polarity of the two pure liquids.The normal boiling point and latent heat of vaporization of the solutions were obtained by extrapolation of the vapour pressure data. The results are important in connection with the distillation of aqueous solutions of hydrogen peroxide.