Experimental determination of diethyl methylphosphonate + CO2 and diethyl methylphosphonate + CH4 phase equilibrium data

FACUNDO MATTEA; COR J. PETERS; MAAIKE C. KROON

St. Petersburg

Congreso; 25th European Symposium on Applied Thermodynamics; 2011

St. Petersburg State University

Equations of state (EoS) that can be used as predictive tools are of great interest for many industrial applications. Group contribution equations of state, such as the GC-EoS developed by Skjold-Jørgensen [1], are useful to extend available experimental information of known systems to similar existing molecules or new molecules where no experimental information is available, but where the molecules share same functional groups. Many authors [2-4] have used the GC-EoS as a modeling tool and several functional groups have been added to the group database. However, new groups are necessary in the pursuit of new solvents. For example, the amine group was recently added to the GC-EoS [5], which required a modification of the GC-EoS by adding an associative term to account for the self-association of amines [6]. In this work, measurements of phosphonate based solvents are presented with the aim of providing the necessary phase equilibria data for a later inclusion of the phosphonate group into the GC-EoS database. For that purpose the solubility of carbon dioxide (CO2) and methane (CH4) in diethyl methylphosphonate (DEMP) was determined at different temperatures. References [1] S. Skjold-Jørgensen, Fluid Phase Eq., (1984), 16, 317-351. [2] T. Fornari, Fluid Phase Eq., (2007), 262, 187-209. [3] S. Espinosa, G.M. Foco, A. Bermudez, T. Fornari, (2000), 172, 129-143. [4] E. Kühne, A. Martin, G-J, Witkamp, C.J. Peters , Aiche J., (2009), 55, 1265-1273. [5] F.A. Sanchez, A.H. Mohammadi, A. Andreatta, S. Pereda, E. Brignole, D. Richon. Ind. Eng. Chem. Res., (2009), 48, 7705-7712. [6] H.P. Gross, S. Bottini, E. Brignole, Fluid Phase Eq.., (1996), 116, 537-544