Abstract
The Peng−Robinson equation of state (PR-EoS) and the Stryjek and Vera modification of the Peng−Robinson equation of state (PRSV-EoS) were used to predict the vapor−liquid equilibrium of the system carbon dioxide(1)/ethanol(2)/water(3) under various temperatures and pressures. We propose a new algorithm that uses a flash calculation to provide a set of initial values and then solves the highly nonlinear phase equilibrium equations using the Broyden modified Newton−Raphson (BNR) method. With interaction parameters for the constituent binary systems, the ternary vapor−liquid equilibrium prediction shows that, at a given temperature, pressure, and water molar fraction in liquid phase, this algorithm is stable to calculate all other compositions. The calculated results from both the PR-EoS and the PRSV-EoS are in good agreement with the experimental data for the binary and ternary systems. A water removal process using supercritical carbon dioxide was experimentally implemented. The pressure dependence of the ...
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