西南石油大学学报(自然科学版)

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Thermodynamics Study Progress of Wax Precipitation in
Multiphase System

Yang Wen, Cao Xuewen   

  1. College of Pipeline and Civil Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China
  • Online:2014-04-01 Published:2014-04-01

Abstract:

Wax precipitation in multiphase system was studied with wax thermodynamic models and experiment methods in
view of sea floor transportation system. Based the analysis of the wax thermodynamic models of Won and Ji’s,the consistency
of calculation method selecting of liquid phase fugacity in vapor-liquid equilibrium and liquid-solid equilibrium,solid-solid
transition,the thermodynamic properties of pure components,Poynting correction term treatment,as well as activity coefficient
calculation should be considered when a new model is built. Experimental measurement methods,such as laser method,
ultrasonic method,acoustic resonance method,quartz crystal microbalance method(QCM),high-pressure micro-differential
scanning calorimetry method(HP–µDSC),which can be used to the analysis of the multiphase system. The results show
that quartz crystal microbalance method has good prospect because of its high sensitivity,and high-pressure micro-scanning
calorimetry method because of its easy conduction,small sample consumption,good reproducibility and almost no influence
of human factors in the testing process.

Key words: multiphase, wax, thermodynamic model, experimental method, mixed transportation system