Saturated vapor pressure of multi-component turpentine: Experimental measurement and prediction model with temperature and concentration

The saturated vapor pressure of turpentine is a key attribute for controlling and responding to changes in tank pressure when turpentine is stored in a tank. To improve tank pressure control decisions, it is useful to have a continuous understanding of the saturated vapor pressure of turpentine in the tank. The saturated vapor pressure of eight turpentine samples at the storage and transport temperatures (283.2 K to 333.2 K) were determined using the reference method. The experimental data were fitted with the Antoine equations to obtain the Antoine parameters, yielding a root mean square deviation of less than 0.07 kPa. In order to simplify the calculation of saturated vapor pressure in complex mixed systems, a prediction model of saturated vapor pressure was proposed based on temperature and component data. The predicted values showed good agreement with the experimental values, with an root mean square deviation of 0.16 kPa. Predicting the saturated vapor pressure of turpentine with the accuracy is helpful for tank pressure management decision-making. Additionally, the relationship between the molar evaporation enthalpy and temperature of the eight turpentine samples was correlated by Clausius-Clapeyron equation to obtain the mean molar enthalpies. Besides, the optimal spatial configuration and binding energy between the molecules of major turpentine components were obtained by DFT calculation, explaining the macroscopic vapor pressure experimental phenomenon from the microscopic point of view.