For the purpose of precisely correlating the data of vapor-liquid equilibria

the present paper proposes a new model named Pseudo-Component Model. Thirty eight sets of isothermal binary systems were chosen to test the model. The findings are as follows: 1. Under a moderate pressure

isothermal vapor-liquid equilibria of binary systems can be correlated by Pseudo-Component Model

with its correlation precision much better than that of UNIQUAC. 2. Pseudo-Component Model car

be applied to various non-ideal systems

especially it can describe the compositions and pressures of azeotropes rather precisely.