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Paper Information

Journal:   AMIRKABIR   Spring 2003 , Volume 14 , Number 54-C; Page(s) 518 To 540.
 
Paper: 

SIMULATION OF WAX CRYSTALLIZATION AND SOLID PHASE FORMATION FROM WAXY MIXTURES IN A BATCH PROCESS: EFFECT OF THERMAL HISTORY ON MORPHOLOGY OF WAX CRYSTALS

 
 
Author(s):  SOLEIYMANY NAZAR R., DABIR B.
 
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Abstract: 

The crystallization and deposition of wax in crude oils and petroleum products cause major difficulties in production, transportation lines and the storage of these fluids. Accurate knowledge wax crystallization process and the effective parameters on this phenomena are required for minimizing these problems. The proper wax inhibitors selection in crude oil as well as prediction of optimum operating conditions to controt deposition, is necessary for full understanding of the mechanisms of wax formation, in order to control wax deposition in transportation crude oil lines. Nucleation, growth and aggregation of wax crystals are the stages of crystallization process, which should be considered in simulation modeling of this phenomena. Crystallization modeling of wax received less attention in the past to predict the solid wax particle size distribution.
In this work, for a first time by using population balance, the phenomenon associated with tile wax crystallization for prediction of particle size distribution in a batch process has been studied. Wax particles size distribution as a function of time and thermal history has been obtained on a typical waxy mixture consist of an oil wax cut and toluene solvent. It was shown that cooling rate has an external effect on eacll stage of crystallization and also alters the morphology of the crystals.

 
Keyword(s): WAX, CRYSTALLIZATION, POPULATION BALANCE, AGGREGATION, COOLING RATE, MORPHOLOGY
 
References: 
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