Liquid−liquid equilibria of ethylene glycol monobutyl ether
(C4E1) + water and diethylene
glycol
monohexyl ether (C6E2) + water at atmospheric
pressure were measured for temperature ranges of 322.8
K and 273.2 K to 382.5 K, respectively. The lower critical
solution temperature (LCST) and upper critical
solution temperature (UCST) of C4E1 + water
were determined to be 322.8 K and 402.8 K, respectively.
The LCST of C6E2 + water is 273.2 K,
while the corresponding UCST does not exist. The
equilibrium
compositions of o-chlorophenol partitioning in the top and
bottom phases of the three binary C4E1
+
water, C6E2 + water, and
poly(oxyethylene(4)) lauryl ether
(C12E4) + water mixtures were also
measured.
High-pressure vapor−liquid equilibria for the binary carbon dioxide + 3-petanol system were measured
at 313.2 K. The phase equilibrium apparatus used in this work was of the circulation type in which the
coexisting phases were recirculated, on-line sampled, and analyzed. The critical pressure and corresponding
mole fraction of carbon dioxide at 313.2 K were found to be 8.22 MPa and 0.974, respectively, for this
binary system. The phase equilibria for the ternary carbon dioxide + 3-pentanol + water system were
also measured at 313.2 K and pressures of 2.00, 4.00, 6.00, 8.00, and 8.25 MPa. This ternary system
showed the liquid−liquid−vapor (LLV) phase behavior over the range of pressure up to the critical pressure
of 8.25 MPa. The binary equilibrium data were all reasonably well-correlated with the Redlich−Kwong,
Soave−Redlich−Kwong, Peng−Robinson, and Patel−Teja equations of state incorporated with the eight
different mixing rules: the van der Waals, Panagiotopoulos−Reid, and six modified Huron−Vidal mixing
rules with UNIQUAC parameters. For the prediction of high-pressure phase equilibria for the systems
containing carbon dioxide and alcohols, the SRK-MHV2 might reproduce many features of the measured
behavior although further tests are needed with other systems.
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