Temperature dependence of excess molar volumes in (n-alkane (C6-C9) or alcohol (C2-C4)) plus olive oil mixtures

In the scope of investigating physical properties related to equipment design for edible oil industries we present the temperature dependence of excess molar volumes of n-alkane (n-hexane, n-heptane, n-octane and n-nonane) or alkanol (ethanol, 1-propanol, 2-propanol, 1-butanol) with natural olive oil being measured at the range 283.15-298.15 K and atmospheric pressure. The phase compositions on every partial miscible binary mixture were obtained by measurement of density and application of the fitting polynomials. Application of contribution methods (UNIFAC and UNIFAC-Lyngby) were applied in order to compare its capability in predicting the experimental values. Derived properties such as partial excess molar volumes, isobaric expansibility and isothermal coefficient of pressure excess molar enthalpy were computed due to its importance in the study of specific molecular interactions. Because of current processes, design is strongly computer oriented, consideration was also given to how accurate the corresponding states prediction works. The validity of predicting densities was tested by the Rackctt equation, this model being selected attending to ease of use, accuracy and range of application. (C) 1999 Elsevier Science B.V. All rights reserved.