Investigation of volumetric fluid properties of (heptane + hexadecane) at reservoir conditions

New Advances in the Modeling and Verification of Experimental Information for Ester–Alkane Solutions: Application to a Batch-Distillation Case

“…For the six compounds of this work, densities were measured at different pressures, p ∈ [0.1–40] MPa, and temperatures, T ∈ [278.15–418.15] K, and are recorded in Table S4. The literature − contains values of ( p , ρ, T ) for the saturated hydrocarbons, and the comparison with our data is shown in Figure S2 (SI), revealing percentage errors lower than 0.3%, validating the experimentation performed. However, no data were found for esters, with original data presented in Table S4.…”

“…To improve the calculations of the activity coefficients γ I , several actions were carried out: (1) New vapor pressures were measured for alkyl propanoates, which showed maximum deviations of 0.8 and 5.5% for the corresponding propyl and butyl alkanoates, respectively, (2) for the two propanoates, original p– ρ –T values were obtained, since there is no information for those esters in the literature; however, new values for the hydrocarbons were also measured, showing errors below 0.3% in relation to published data, − and (3) with the p –ρ– T database generated, the evaluation of the molar volumes of pure compounds at saturation v i o ( T ) was improved using a combined form of the Tait–Rackett equations (see eqs and ). This improvement allowed a theoretically more robust calculation of the activity coefficients through the γ–ϕ formulation for VLE data.…”