Abstract
Mutual solubility of a binary system of heptylamine and water in the temperature range of 0° to 90° was measured and a peculiar solubility curve was obtained. The jelly-like state formed in the concentration range of 30-70w% of heptylamine was studied and the presence of heptylamine heptahydrate was assumed.Mutual solubility of a ternary system of heptylamine-water-sodium hydroxide was determined at 20.3, 40.2, 59.7, and 79.4° and their equilibrium diagram was obtained. A smooth, conjugation curve was also obtained. A conjugation curve drawn with the concentration of the amine in the upper layer and that of sodium hydroxide in the lower layer as the molar fraction units, gave a straight line within a certain concentration range and the straight lines at each temperature were found to be approximately parallel to each other. The concentration of heptylamine present in equilibrium with a definite concentration of sodium hydroxide solution increases with the increase in temperature and the concentration of heptylamine in the upper layer was greater, the greater the concentration of sodium hydroxide in the lower layer when the temperature was constant.
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