Equilibrium association precision data and a method of phase equilibrium estimation method

Providing a gas-liquid equilibrium data for the two-component system is represented by a wide range of data equilibrium method for estimating accurately the existing equilibrium phase equilibrium data, control or design process for separating, purifying device using the same components , and a means of these designs or design program control device. Equilibrium measurement data calculated from the critical point by the following formula (22) and the arrival rate X by the following formula (24) using a two-component system, the pressure at infinite dilution formula (25) in a gradient of Y1 and Y2 (wherein, critical pressure Pc1 represents a component of the two-component system, p1s, p2s represent components at temperature T 1 and component 2 of the vapor pressure, γi∞ indicates infinite dilution of the liquid phase for live component i coefficient), the resulting X and Y1 Y2 and associated new infinite dilution activity coefficient was calculated from the X-Y1 and associated X-Y2 associated γ1∞, γ2∞ or two-component system parameters a, B, obtained by the γ1∞, γ2∞ or A, B estimated equilibrium. Using the values ​​thus obtained component is isolated and purified by means of distillation column design and control. Reach the critical point X: (22), the pressure gradient at infinite dilution Y1 and Y2: (24), (25).