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Citation: Zhang Jianhou*, Hou Huaiwen. PREDICTION OF EXCESS VOLUME AND EXCESS ENTHALPY FROM PROPERTIES OF PURE COMPONENTS——PROPOSAL OF A NEW EQUATION OF CORRELATION[J]. Acta Physico-Chimica Sinica, ;1989, 5(02): 224-227. doi: 10.3866/PKU.WHXB19890219 shu

PREDICTION OF EXCESS VOLUME AND EXCESS ENTHALPY FROM PROPERTIES OF PURE COMPONENTS——PROPOSAL OF A NEW EQUATION OF CORRELATION

1.
Department of Chemical Engineering; Tianjin University

Received Date: 8 July 1987
Available Online: 15 April 1989

On the basis of a general functional relation representing the actual PVT properties of liquids, an equation of state of the van der Waals type has heen obtained. A new equation of correlation for prediction of excess volume and excess enthalpy has been derived from the above equation as follows:
V~E=R[((~n∑_(i=1)x_iV_i+V~E)~n∑_(i=1)x_i Φ_i)/(2PV~E/T+~n∑_(i=1)x_iV_iγ_i-H~E/T)-~n∑_(i=1)(x_i Φ_i)/γ_i]
where
Φ=(γVT/R)/(1/α+2T-2P/γ)
The results of calculation of its application to 77 binary systems with 148 experimental points show that, for prediction of V~E, it is better than the Flory method and in the wide scope concerned obviously much better than the Liebermann method and, for prediction of H~E, it is generally as od as the Pollin and Fried method. The equation of correlation proposed is simple in calculation, and can be applied to multi-component systems consisting of may liquids.
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