This paper contains the results of a new experimental study of the effect of temperature on density and ultrasonic velocity for palm oil (Elaeis guineensis) and evening primrose seed oil (Oenothera biennis), due to their worldwide economic importance and potential for intensive farming in arid areas or regions with irregular rainfall/low water resources. Current processes design is strongly computer oriented then, consideration was also given to how accurate different theoretical prediction methods work. The Halvorsen’s model and Collision Factor Theory were selected for prediction, attending to ease of use, accuracy and range of application, a good response at the studied conditions being observed, despite of geometrical simplifications and the use of estimated critical magnitudes by molecular group contribution approach.
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