アミン-水-苛性アルカリ系の平衡 (第1報)

ジェチルアミン-水-苛性ソーダ系の相互溶解度

抄録

Equilibrium diagram for the diethylamine-water-sodium hydroxide system at 0°, 20°, and 40° was obtained. Diethylamine and water form a completely miscible solution but addition of sodium hydroxide results in partially miscible two liquid phases. Their mutual solubilities decrease with the increase of temperature so that the dehydration effect of sodium hydroxide becomes greater as the temperature increases. In the system of equal composition, the concentration of diethylamine in the upper layer becomes higher with the rise in the temperature. The composition of conjugate solutions of over ten pairs at 0°, 20°, and 40° was determined. According to this result sodium hydroxide does not dissolve into the upper diethylamine layer when the concentration of sodium hydroxide reaches a certain level and diethylamine does not dissolve into the lower sodium hydroxide layer. The concentration of diethylamine present with the saturated solution of sodium hydroxide is approximately 100%. It has become possible, by the utilization of binodal curves and tie-lines of a three-component system, to find the most advantageous method for the dehydration or isolation of organic amines.