Measurement of phase equilibria at high pressures by tracer‐pulse chromatography

Abstract

AbstractTracer‐pulse chromatography allows the accurate measurement of sorption isotherms even at elevated pressures and in systems with more than one solute. Vapor equilibria of normally liquid solutes are best measured by scintillation counting of a liquid in which the column effluent and the emergent radioactive pulse are absorbed. An example is the equilibrium adsorption of n‐heptane by molecular sieves at 200°C. and at pressures up to 3 atm. Sorption equilibria of permanent gases are measured by use of a more conventional differential technique wherein the column effluent passes through an ion chamber. Its use is illustrated by the equilibrium adsorption of methane by activated charcoal at pressures up to 70 atm.