Abstract
Summary The success of phase-behavior calculations based on an equation of state (EOS) depends to a great extent on the quality of the selected initial estimates of the independent variables. Estimates considerably different from the final answer often lead to either trivial solutions or convergence problems. The method presented in this paper consists of obtaining the maximum possible information concerning the vapor/liquid equilibrium of the mixture by directly solving the selected EOS before the start of the main iterative calculation. The information obtained, with minimal computational cost, is subsequently used to initiate a Newton-type iterative method that is stable and converges rapidly toward the solution when good estimates are provided.
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