A continous-flow apparatus was used to measure vapor-liquid phase equilibrium data for the ethane-trinormalbutylaluminum (TnBA) and ethane-trinormalhexylaluminum (TnHA) systems. The apparatus includes a view cell to observe phase behavior at equilibrium conditions. The ethane-heptane system was studied at 394 K and pressures from 41.4 to 82.7 bar to ensure the reliability of the apparatus for obtaining accurate vapor-liquid equilibrium data. On-line, homogeneous, vapor- and liquid-phase samples were obtained for analysis by gas chromatography. The phase compositions determined by analytical and gravimetric methods are in good agreement with those reported previously in the literature. The ethane-TnBA and ethane-TnHA systems were each studied along the three isotherms of 348, 373 and 398 K. The pressures ranged from 82.7 to 148.2 bar for the ethane-TnBA system and 89.6 to 175.1 bar for the ethane-TnHA system. Equilibrium vapor- and liquid-phase compositions were obtained along each isotherm at selected pressures by a gravimetric method. The phase equilibrium data were correlated and checked for internal consistency.