Isobaric process

Abstract: A kinetic study was conducted to ascertain whether heat transfer controls the rate of hydrogen evolution from LaNi 5 H 6 . A series of LaNi 5 H 6 -Al mixtures containing 2.5, 5, 10, 20, 30 and 100 wt.% LaNi 5 H 6 were prepared and the hydrogen desorption rates were measured. It was found that in mixtures containing 100, 30, 20, 10 and 5 wt.% LaNi 5 H 5 the desorption rates increased with increasing percentage of aluminum. This indicates that heat transfer is rate controlling. Desorption rates from mixtures containing 5 and 2.5 wt.% LaNi 5 H 6 , however, were almost the same indicating that in very dilute mixtures the heat transfer rate is sufficient to achieve near-isothermal conditions. The reaction was found to be first order for each mixture under isobaric conditions.

Abstract: : A semi-empirical test for the thermodynamic consistency of isobaric liquid-vapor equilibrium data for ethanol-water saturated with a salt is proposed. The test is based upon an adaptation of the Herington method in which the ternary system is treated as a special binary. The test is applied both to full concentration range data and to data which are incomplete at the high alcohol end. For data which are incomplete at the high water end, a less severe test is employed. Literature data for 23 system composed of ethanol, water, and an inorganic salt at saturation were tested. By the criterion of the proposed test, fourteen were deemed consistent, six were borderline, and three were pronounced inconsistent. (Author)