Application of UNIFAC models for prediction of vapor–liquid and liquid–liquid equilibria relevant to separation and purification processes of crude biodiesel fuel

Phase equilibria modeling of biodiesel related mixtures using the GCA-EoS model

“…Korgitzsch [2] presents liquid-liquid experimental results on the binaries between water, methyl ester and glycerol and on the ternary systems of glycerol, methyl ester and methanol; the correlation of the data is made using the UNIQUAC [3] and NRTL [4] models. Kuramochi et al [5] have made predictions of vapor-liquid and liquid-liquid equilibria using different UNIFAC [6,7] models and some data on the solubility of water in methyl esters are reported. The distribution coefficients of methanol between the biodiesel and glycerol phases were studied by Chiu et al [8] and by Di Felice et al [9].…”

Process design of continuous biodiesel production by reactive distillation: Comparison between homogeneous and heterogeneous catalysts

“…They reported that the Dortmund modified UNIFAC model was the most appropriate one to represent the models of VLE and LLE of the methanol-soybean biodiesel and methanolglycerol mixtures. Moreover, Dortmund modified UNIFAC allows prediction of solubility of water in biodiesel, which is of importance for the design of a purification process for water-washed biodiesel[22]. The rigorous continuous stirred tank reactor (CSTR) model in Aspen plus was employed for the conventional process.…”

Study of an energy-integrated biodiesel production process using supercritical methanol and a low-cost feedstock

“…The activity of the compounds in the liquid phase was described using the NRTL (non-random two liquid) or the UNIQUAC (universal quasi-chemical) models. The vapor-liquid [13]. Modeled process units were the flash drum (FS-1), the expansion valve (VLV-1), the heat exchangers (HE01-HE04) and the distillation column (T-1).…”

“…2. The reactions of dehydration (11, 12, 17 and 18), etherification (13)(14)(15)(16) and reforming of glycerol (19) are thermodynamically feasible. In contrast the formation of polyglycerols (10) is scarcely feasible.…”