it is not surprising that they respond similarly toward salt solutions. It appears that secondary amines may be slightly superior to the tertiary amines.Table II and Figure 5 show the results of a study which confirms the validity of the expression K = {K+ K .)12.Gradient quantities of adipic and oleic acid were added to diisopropylamine and equilibrated with 0.1% salt solution.These acids add foreign ions to the system and increase considerably the supply of amine ions.The adipic acid, being water-soluble, increases the supply of anions in the water phase, raising the sodium selectivity. The water content of the amine phase is reduced, probably through increase in the electrolyte content of the water phase. Oleic acid suppresses the sodium selectivity. The water content of the amine is increased, probably through solvation with the oleate ions. Although the individual ionic selectivities were affected radically, the mean selectivity was unaffected, except by the variation in water content. The results obtained with these acids agree with the other secondary amine data. ACKNOWLEDGMENTThe support of this work by the Office of Saline Water, Department of the Interior, Washington, D. C., is gratefully acknowledged.

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Saturation pressures were measured for sodium, potassium, and cesium to temperatures of 2540°, 2400°, and 2350°F ., respectively, using a static method and a refractory metal apparatus with a diaphragm as a null-point detector. Vapor-pressure equations of the KirchhofF type accurately represent the observed data for extended temperature ranges with standard per cent deviations of ±0.52 for sodium, ±0.43 for potassium, and ±0.53 for cesium.

A virial equation of state for rubidium with coefficients through the fifth virial is predicted from experimental PVT data of potassium and cesium by application of the thermodynamic similarity principle. Exact thermodynamic relationships involving virial coefficients and other selected literature properties are used to generate saturation and superheat properties of rubidium vapor. Values of enthalpy, entropy, specific heat, and specific volume are tabulated for some 200 selected states in the temperature range from 1300°to 2400°F. and in the pressure range from 0.2 to 28 atm.

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Heat Transfer Studies on a Forced Convection Loop with Biphenyl and Biphenyl Polymers number of liquid organic materials have been used as heat transfer media at temperatures to about 600°F. for a number of years. More recently certain stable aromatic and alkyl-aromatic compounds, such as biphenyl, terphenyl mixtures, and monoisopropylbiphenyl, have been considered for possible primary coolants at temperatures to about 800°F. These materials have poorer heat transfer properties and stability than water; however, their relative inertness to container materials and high boiling temperatures make them attractive for many applications.