Predicting Solubility of Tributyl Phosphate in Supercritical Carbon Dioxide

Sustainable process-product development & green chemistry

SCF as Solvent Substitutes (T1-8P)

Mr reza orouj
university of tehran
chemical engineering department
iran, tehran, P.O Box 11365/4563
Islamic Republic of Iran

Mr hosein abolghasemi
tehran university
chemical engineering
No.1; Enghelab Street; Tehran; Iran
Islamic Republic of Iran

Mr Mohammad Mahdavian
Tehran University
Chemical Engineering Depatrment
Chemical Engineering Department, University of Tehran,
Islamic Republic of Iran

Mr mohsen tabasi
university of tehran
Chemical Engineering Department
P.O Box 11365/4563, Tehran, I.R. Iran
Islamic Republic of Iran

Keywords: Keywords: Solubility, Supercritical fluid, Tributyl phosphate, cubic equation of state

Abstract
In this work, two methods were developed to estimate the solubility of Tributyl phosphate (TBP) in supercritical CO2. First method used Soave-Redlish-Kowang (SRK) and Peng-Robinson (PR) equations of state with Huran-Vidal mixing rules while the second method used based-density models for a direct relation between density of solvent and solubility. Since there were not any data for critical properties of Tributyl phosphate (TBP), a new method for evaluating of C2 (mixing rule parameter), as a function of temperature and pressure, was recommended. This function for C2 has never been reported in the literature. This method in comparison with others such as group contribution methods, predicts good result and the amount of Average Absolute Relative Deviation (%AARD) 9% and 17% obtained for SRK-EOS and PR-EOS respectively. Also, two based-density modified equations with variable coefficients (employing Chrastil and semi-empirical model) were used which resulted 6% AARD. Furthermore, critical properties of Tributyl phosphate (TBP) were estimated based on matching method with experimental solubility data.

Presented Monday 17, 13:30 to 15:00, in session SCF as Solvent Substitutes (T1-8P).