Comparison of Determination Method for Wax Melting Point and Wax Precipitation Point of Waxy Crude Oil

Wax precipitation point and wax melting point are the important parameters that can characterize wax melting process,Under the same experimental conditions,the wax melting point is much closer to the equilibrium point of solid phase and liquid phase than wax precipitation point,According to the determination method of wax precipitation point of crude oil,the wax melting point of Daqing Crud Oil is determined separately by the rheometer and the differential scanning calorimeter(DSC),and compared by the wax precipitation point obtained at the same temperature condition.The results show that the wax melting point measured by rheometer is 12 ℃ higher than wax precipitation point,wax melting point determined by DSC is 18 ℃ higher than wax precipitati-on point-Based on the measuring principle of two instruments,it is believed that result obtained by DSC is more accurate.