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Articles you may be interested inOn the simulation of vapor-liquid equilibria for alkanes J. Chem. Phys. 108, 9905 (1998); 10.1063/1.476429 Interfacial tension and vapor-liquid equilibria in the critical region of mixtures J. Chem. Phys. 88, 7772 (1988); 10.1063/1.454290 Erratum: New apparatus to perform fast determinations of mixture vapor-liquid equilibria up to 10 MPa and 423 K [Rev. Sci. Instrum. 5 7, 469 (1986)] Rev. Sci. Instrum. 58, 321 (1987); 10.1063/1.1139670 New apparatus for simultaneous determination of phase equilibria and rheological properties of fluids at high pressures: Its application to coal pastes studies up to 773 K and 30 MPa Rev. Sci. Instrum. 57, 1192 (1986); 10.1063/1.1138628 Simultaneous determination of vapor-liquid equilibria and saturated densities up to 45 MPa and 433 K Rev. Sci. Instrum. 55, 944 (1984);A new apparatus to measure vapor-liquid equilibria of mixture has been designed to work up to 10 MPa and 423 K. This apparatus makes it possible to take reproducible and representative samples and inject them directly into a chromatographic circuit {the same requirements were already satisfied by another apparatus described in a previous paper [Po Figuiere, J. F. Hom, S. Laugier, H. Renon, D. Richon, and H. Szwarc, AIChE J. 26, 872 (1980) n. The use of the new apparatus is very simple. Comparisons with data from Kay and Albert [Ind. Eng. Chern. 48, 422 ( 1956)] reveal a strong similarity in the whole pressure range. Measurements in the critical region do not involve significant experimental difficulty.

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The present work was undertaken in order to obtain data for hydrogen-hydrocarbon systems at high pressures and temperatures. The cell materials and the measurement method were chosen with this objective. The method is especially suitable to study mixtures composed of at least one permanent gas and one high boiling liquid between 150" and 400°C and 5 000 and 40 000 KPa.Both dynamic and static methods can be used at high temperatures and pressures. A static method seemed more appropriate for a not too expensive laboratory apparatus. T Figure la. = partition coefficient = y/x = vapor pressure of pure component = liquid phase, mole fraction = vapor phase, mole fraction Manuscript

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