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Calculation of the activity coefficients and vapor composition from equations of the Tao method modified for inconstant integration step Δx. I. Binary systems

J. Dojčanský and J. Surový

Department of Chemical Engineering, Slovak Technical University, 880 37 Bratislava


Abstract: The basic equations of the original Tao method (1961) for calcg. the binary liq.-vapor equil. from P-x or t-x data were modified for the inconst. integration step Δx. The modified equations permit calcn. of the activity coeffs. of components and the vapor phase compn. directly from the exptl. points; the functional relationship of the P-x or t-x data need not be known. The modified form of the basic equation provides a convergence of the iterative soln. An inevitable condition of the soln. is to carry out the calcn. in the direction of the increasing values of the total pressure, analogously to the integration of the coexistence equation.

Full paper in Portable Document Format: 291a28.pdf


Chemical Papers 29 (1) 28–33 (1975)

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