Isothermal vapor-liquid equilibrium data for binary systems at high pressures: carbon dioxide-methanol, carbon dioxide-ethanol, carbon dioxide-1-propanol, methane-ethanol, methane-1-propanol, ethane-ethanol, and ethane-1-propanol systems

Measurement and modeling of epicatechin solubility in supercritical carbon dioxide fluid

“…The system was heated to a desired temperature (313.15, 323.15, 333.15, or 343.15 K). Subsequently, liquid CO 2 was pumped into the system using the high-pressure pump until a desired pressure was reached (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26). After equilibrium condition was achieved in 4 h (insignificant increase of epicatechin concentration in CO 2 was observed after 3 h), the output valve was released, and the sample flowed into a collector containing a known amount of ethanol to separate epicatechin and CO 2 .…”

“…In their report, Cháfer et al [22] used ethanol as cosolvent in the range of 5-30%. The presence of high amount of ethanol in their system may have changed the supercritical condition of CO 2 into subcritical [26][27][28][29]. Joung et al [29] found that the maximum concentration of ethanol in the system should be 6.49 mol% at 8.15 MPa and 313.15 K in order to obtain supercritical condition.…”

Catechin sublimation pressure and solubility in supercritical carbon dioxide

“…TheSC-CO 2 extraction of catechin without using cosolvent was not feasible since only trace amount was extracted. However, the presence of a high amount of ethanol in SC-CO 2 (≥15 mol.%) will change the supercritical condition to subcritical since ethanol has a high critical temperature of 513.9 K [2,3,18,19]. In this work, catechin solubility in SC-CO 2 was investigated in a wider range of pressure and temperature (12-26 MPa and 313.15-343.15 K, respectively) than the published data.…”

“…The heating chamber was heated to a desired temperature (313.15, 323.15, 333.15, or 343.15 K). Liquid CO 2 was subsequently pumped into the system using a high pressure pump until a targeted pressure was achieved (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26). After equilibrium condition was achieved in 4 h, the sampling tube (1 ml) was disconnected from the system.…”

Parameter estimation for VLE calculation by global minimization: the genetic algorithm

“…The maximum likelihood principle (MLE) has been applied by several researchers for the correlation of vapor-liquid equilibrium data under atmospheric pressure up to high pressure, such as Cardozo-Filho et al (1997). These authors applied MLE to the modeling of the CO 2 + ethanol binary system (Yoon et al, 1993;Suzuki et al, 1990) with the Peng-Robinson equation of state, and their results are better tan those with the least squares error (LS) method. Then, the mMyGa program was applied to adjust the same binary system with the simple least squares error in the objective function, as is shown below:…”