Wax appearance temperature (WAT) determinations of different origin crude oils by differential scanning calorimetry

In this research, wax appearance temperatures (WAT) of eight different crude oils from south-eastern region of Turkey were determined by differential scanning calorimetry. The experiments were performed at a heating/cooling-rate of 2 °C/min from 60 to −20 °C It was observed that the wax appearance temperature of different origin crude oils was varied between 14.2 and 37.8 °C depending on the API gravity and wax content. It was also observed that the crude oils have enthalpy of precipitation ranging from −3.42 to +6.39 mW and melting enthalpy from - 2.5 to +7.46 mW, respectively.