Another look at the water solubility in biodiesels: Further experimental measurements and prediction with the CPA EoS

In a previous work we addressed the importance of knowing and describing the water solubility in biodiesels, for producing high quality biodiesel using the most suitable feedstock and operating the processing plants at the optimal conditions. The lack of information on the water solubility in methyl linoleate limited the quality of the results then reported. To overcome the identified limitations new water solubility measurements were carried out for methyl linoleate and four methylic biodiesels synthesized at our laboratory from the main oil feedstock currently used for biodiesel production (soybean, palm, rapeseed and sunflower oils). w experimental data presented here for the water solubility in methyl linoleate allowed to obtain the information about the binary system water/methyl linoleate (specifically the binary interaction parameter, kij) to be used in the modeling of multicomponent systems (biodiesels) with the CPA EoS. With this new interaction parameter the new experimental water solubilities reported in this work for four biodiesels were predicted with the CPA EoS with global average deviations inferior to 7%.