Experimental Vapor-Liquid Equilibrium for the Ternary System Carbon Dioxide + Octane + Decane at 313, 343 and 373 K

Abstract

For the design, optimization and separation of chemical processes, information about high- pressure phase equilibria is essential. This comes from the need for knowing, understanding and developing thermodynamic models for multicomponent mixtures. In this work experimental vapor-liquid equilibrium was measured for the ternary system CO₂ + n-octane + n-decane at temperatures of 313.59, 344.28 y 373.5 K up to 14.3 MPa of maximum pressure. The behavior of equilibrium ratios is proportional to pressure changes for octane and decane. In the case of carbon dioxide, the trend of equilibrium ratios is inversely proportional to pressure changes. The experimental apparatus is based on the static-analytic ⁽¹⁾ method which uses the ROLSI ⁽²⁾ mobile capillary sampler-injector. The obtained experimental vapor-liquid equilibrium data were correlated with the Peng-Robinson equation of state coupled to the Van der Waals mixed rule.

1. New Apparatus for the Fast Determination of High-Pressure Vapor−Liquid Equilibria of Mixtures and of Accurate Critical Pressures. L.A. Galicia-Luna, A. Ortega-Rodriguez, D, Richon. (265-271), México : J. Chem. Eng Data , 2000, Vol. 45.

2. Rapid on-line sampler-injector: a reliable tool for HT-HP sampling and on-line GC analysis. P. Guilbot, A. Valtz, H. Legendre and D. Richon. (426-431), France : Wiley-VCH, 2000, Vol. 28.