VAPOR-LIQUID-EQUILIBRIA OF A MINUTE AMOUNT OF FURFURAL IN WATER-ETHANOL-1-PROPANOL SYSTEM

Vapor-liquid equilibria of water-ethanol-1-propanol system containing a minute amount of furfural were measured at atmospheric pressure by u se of an Othmer-type still. The experimental results are represented b y two triangular diagrams against the liquid compositions of the major components (water, ethanol and 1-propanol), in which one diagram show s the vapor compositions of ethanol and 1-propanol, and another diagra m shows the equilibrium ratio of the trace component (furfural). The c urved surface of the equilibrium ratio of the trace component exhibits a bow-shaped downward plane in the water-rich area and shows a ridge in the neighborhood of the water-1-propanol side. In the alcohol (etha nol and 1-propanol)-rich area it exhibits a saddle-shaped face.