Modeling the Polystyrene-Asphaltenes-Toluene Mixture Using the Perturbed-Chain Form of Statistical Associating Fluid Theory Equation of State

Ali A. Alhammadi, Walter G. Chapman

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Typically, the addition of a non-adsorbing polymer to a system containing colloidal particles causes a phase separation in a mechanism known as depletion flocculation. Recent experiments have shown that the addition of polystyrene to a mixture of asphaltenes and toluene causes phase separation into two liquids.1 In this paper, this effect is modeled using the perturbed-chain form of statistical associating fluid theory (PC-SAFT) equation of state, demonstrating agreement with the experimental data. The effects of the temperature, pressure, and polystyrene mean molecular weight on the mixture phase behavior are investigated. The phase behavior of the system was not sensitive to pressures up to 1500 atm; however, increasing the temperature or reducing the mean molecular weight of polystyrene caused the one-phase region to expand. The paper demonstrates that a solution model with rigorous physics is able to capture the phase behavior that is typically described as a depletion flocculation mechanism in the colloidal literature.

Original languageBritish English
Pages (from-to)6019-6024
Number of pages6
JournalEnergy and Fuels
Volume31
Issue number6
DOIs
StatePublished - 15 Jun 2017

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