Ethylene diamine-water system is known to form a maximum boiling mixture with 2O to 25 per cent by weight of water at 118.5°C⁸⁾ or 118.7°C⁴⁾ under atmospheric pressure. In this paper experimentally determined results for the vapor-liquid equilibrium relations under various pressures are presented and the pressure effect on azeotropism is discussed.
From the results disappearance of the azeotrope was clearly shown under slightly pressurised conditions above 1.77 atm. absolute and the degree of variation in relative volatility with composition decreased with increase in pressure. Possibility of separating the mixture into its components without adding a third component was also shown from the resultant vapor-liquid equilibrium relations.