Robustness and efficiency of phase stability testing at VTN and UVN conditions

A unified presentation of phase stability analysis including all major specifications

“…( 9), which is effectively used in PT stability testing. The modified TPD function for PHN stability (similarly to PT [6], VTN [28] and UVN [13] stability) is * ()…”

“…The required partial derivatives with respect to molar densities are related to partial derivatives with respect to mole numbers, based on homogeneity properties of the derivatives of the thermodynamic potentials, as described in Refs. [12,13,28].…”

“…[8,9]. Among all specifications other than PT, VTN phase equilibrium is the best documented in the literature [1,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

“…Derivations of the TPD function for VTN stability were given by Mikyska and Firoozabadi [10] and Castier [11]. Phase stability testing at VTN condition was investigated by Nichita et al [8], Mikyska and Firoozabadi [10], Castier [11], Nichita [12,13], Smejkal and Mikyška [14][15][16], Kou et al [17], Kou and Sun [18], Jex and Mikyška [19]. A special topic, closely related to equilibrium at VTN specifications, consists of the so-called "volume-based" phase equilibrium calculations at PT specifications (Michelsen [1], Nagarajan et al [25], Kunz et al [26], Deiters and Kraska [27], Nichita [28], Paterson et al [29], Sandoval et al [30]).…”

“…A derivation of the TPD function at UVN conditions was apparently first given by Castier [52], who also showed that a PT stability testing can be carried out to assess UVN stability. Phase stability at UVN conditions was addressed by Castier [52], Smejkal and Mikyška [54,55], Bi et al [56] and Nichita [13].…”