Experimental measurements and thermodynamic modeling of high-pressure propane solubility in triethylene glycol

Abstract

The solubility of propane in TEG was measured via bubble point experiments using the Cailletet equipment. The results indicated that within some ranges of the P-T -x space, this system shows an inverse temperature effect, i.e., an increase of propane solubility with increasing temperatures, contrary to most gas solubilty measurements. Thermodynamic modeling of the phase behavior of propane + TEG system was undertaken using the Peng-Robinson EoS and various mixing rules. The UNIQUAC GE model was used together with the WS and HV mixing rules. The results indicated that the GE mixing rules provides satisfactory results for this system, with the WS mixing rule demonstrating the best results (AARD% of 5.06% in bubble point pressure calculations). The modeling results also indicated that the temperature-dependency of the binary interaction coefficient, kij, in the vdW mixing rules is very important for accurate results.