Chintya Effendi, Margareth Shanty, Yi-Hsu Ju, Alfin Kurniawan, Meng-Jiy Wang, Nani Indraswati, Suryadi Ismadji
The solubilities of acetoin (3-hydroxy-2-butanone), a frequently used buttery-odor compound in supercritical carbon dioxide (SC-CO2) at several pressures and temperatures were measured in this work. The measurements were conducted in a static-analytic mode at several pressures ranging from 8MPa to 28MPa and four temperatures of 313.15K, 323.15K, 333.15K, and 343.15K. The equilibrium was established for 3-4h. The solubilities of acetoin in SC-CO2 increased with increasing both pressure and temperature beyond the crossover pressure at 8MPa. Two density-based models namely Chrastil and Del Valle-Aguilera and Peng-Robinson equation of state (PR-EOS) with quadratic and Stryjek-Vera mixing rules were used to represent experimental solubilities and to describe phase behavior of the system. Both Chrastil and Del Valle-Aguilera models were able to correlate experimental solubility data satisfactorily with absolute average relative deviation (AARD) of 0.27%. Similarly, the phase equilibrium behavior of acetoin+supercritical CO2 binary system can be well interpreted by PR-EOS with quadratic (AARD of 0.11%) and Stryjek-Vera mixing rules (AARD of 0.08%). © 2013 Elsevier B.V.
Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya 60114, Indonesia; Department of Chemical Engineering, National Taiwan University of Science and Technology, Keelung Rd., Taipei 106, 43, Sec. 4, Taiwan