アミン-水-苛性アルカリ系の平衡 (第5報)

Abstract

Mutual solubilities in the nicotine-water-sodium hydroxide system at 0°, 30°, 60°, and 90° were measured and equilibrium diagrams were drawn. Conjugation curve, drawn with the concentration of sodium hydroxide in the lower layer of the conjugate solution as the abscissa and the concentration of nicotine in the upper layer as the ordinate, was found to become linear within a limited concentration range when the concentration unit is shown by molar fraction, although the curve deviates from the straight line in the extremely low or high concentration. These curves at various temperatures run almost parallel. The composition of the conjugate solution comes to be over 90% nicotine in the upper layer when the amount of sodium hydroxide in the lower layer is over 20%, and the lower layer is practically devoid of nicotine, with none of sodium hydroxide in the upper layer. Except in the case of 0°, the upper layer present with 35-40% sodium hydroxide solution is almost 100% nicotine. The concentration of nicotine in equilibrium with a definite concentration of sodium hydroxide solution increases with the increase of temperature. The present experimental results have offered advantageous method for the isolation and dehydration of nicotine.