Esther Forte, Felix Llovell, Lourdes F. Vega, J. P. Martin Trusler, and Amparo Galindo.
J. of Chemical Physics, 2011, 134, 154102, DOI: 10.1063/1.3570614.


An accurate prediction of phase behavior at conditions far and close to criticality cannot be ac- complished by mean-field based theories that do not incorporate long-range density fluctuations. A treatment based on renormalization-group (RG) theory as developed by White and co-workers has proven to be very successful in improving the predictions of the critical region with different equations of state. The basis of the method is an iterative procedure to account for contributions to the free energy of density fluctuations of increasing wavelengths. The RG method has been com- bined with a number of versions of the statistical associating fluid theory (SAFT), by implementing White’s earliest ideas with the improvements of Prausnitz and co-workers. Typically, this treatment involves two adjustable parameters: a cutoff wavelength L for density fluctuations and an average gradient of the wavelet function