Physicochemical Research on Effect of Pour Point Depressant on Wax Precipitation and Dissolution of Waxy Oil

Abstract

Abstract: The heating cooling procedures were studied with differential scanning calorimeter.Equilibrium wax dissolution temperature(WDT), wax precipitation temperature(WPT) and solubility as well as saturation of undoping and doping pour point depressant were measured and analyzed thermodynamically.The results show that equilibrium WDT is higher than WPT, and pour point depressant(PPD) can make the WDT increase and the WPT decrease, resulting in large depression of pour point of waxy oil.The relationship between wax solubility saturation and temperature accords to Van′t Hoff equation.The dissolving enthalpy and entropy of the wax of pour point depressant doped oiLIncreased, but the precipitation enthalpy and entropy of the wax of pour point depressant doped oil decreased.PPDmakes the critical radius and the potential barrier of nucleation of wax crystaLIncrease, and makes the separation of wax from waxy oil difficult.

Key words: Waxy oil, Pour point depressant(PPD), Enthalpy, Entropy

CLC Number:

O648.122

TrendMD:

LI Chuan-Xian, ZHANG Chun-Guang, SUN De-Jun, SUN Jie . Physicochemical Research on Effect of Pour Point Depressant on Wax Precipitation and Dissolution of Waxy Oil[J]. Chem. J. Chinese Universities, 2003, 24(8): 1451.

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Physicochemical Research on Effect of Pour Point Depressant on Wax Precipitation and Dissolution of Waxy Oil

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