アミン-水-苛性アルカリ系の平衡 (第2報)

Triethylamine-H₂O-NaOH及びTriethylamine-H₂O-KOH系の相互溶解度

抄録

The lower critical solution point of the triethylamine-water system was assumed to exist at 17.6° at the composition of 28-32% of triethylamine. Mutual solubility of the triethylamine-water-sodium hydroxide system at 0, 20, 40, 60, and 70°, and triethylamine-water-potassium hydroxide system at 0, 30, and 60°, were determined. It was thereby found that, in the amine-water-alkali hydroxide system, the mutual solubility decreases with the increase of temperature at the same composition, while the concentration of the amine in the upper layer increases with the increasing concentration of the alkali hydroxide in the lower layer, at a definite temperature. In other words, the concentration of the amine coexistent with alkali hydroxide solution increases with the increasingly high temperatures. Comparison of the dehydration effect of sodium and potassium hydroxides against the amine showed that sodium hydroxide possessed larger effect at a low temperatures while potassium hydroxide was better at higher temperatures. By the utilization of these properties, the best method for the dehydration of the amine or its isolation from an aqueous solution can easily be obtained.