Fractionation technologies for liquid mixtures using dense carbon dioxide

High-pressure (vapour+liquid) equilibria for ternary systems composed by {(E)-2-hexenal or hexanal+carbon dioxide+water}: Partition coefficient measurement

“…The temperature value of the ROLSI™ sampler (2) and its transfer line measurements. After each point was measured, the liquid phase sampling line was cleaned with fresh CO 2 , using two-way valves (15), and a vacuum pump (16). The vapour phase line was continuously cleaned by the carrier gas flow from its storage tank (11).…”

“…Alternative technologies for the recovery, concentration and fractionation of fruit aromas are membrane processes, such as pervaporation, and less common techniques such as Current Supercritical Fluid Fractionation (CC-SFF) in packed columns [14][15][16]. The applications of CC-SFF in packed columns of aqueous solutions are mainly related to alcoholic beverages.…”

Fractionation of a dilute acetic acid aqueous mixture in a continuous countercurrent packed column using supercritical CO2: Experiments and simulation of external extract reflux

“…At 30 MPa, the recovery ratio of AA in the CO 2 -free extract increased to 70 % and mass fraction of AA in the CO 2 -free extract from 41 % at 10 MPa to around 50 %, this latter exhibiting a plateau around 15 MPa. As already mentioned, note that higher pressures are usually not considered, according to literature reviews [17,38], mostly because, in the case of aqueous systems, density difference becomes too low for easy decantation of phases. At 30 MPa, density difference is around 110 kg/m 3 .…”

“…So, usual drawbacks of liquid organic solvents could be alleviated. Such a process is usually operated using countercurrent packed columns in a continuous mode [17]. Supercritical extraction applied to liquids has been reported for separation of aqueous solutions (dealcoholisation of beverages [18,19] and recovery of aromas from fruit juices [20]) or for essential oil deterpenation [21].…”

Rate-based simulation of a high pressure counter-current packed column for supercritical CO2 extraction of alcohol from dilute aqueous mixtures

“…Fractionation of liquid mixtures using supercritical solvents has been proposed and studied as a promising tool for new separation challenges, as well as an alternative to current separation processes [1,2]. In this way, the use of supercritical carbon dioxide (scCO 2 ) as a solvent proposes a more environmentally friendly technology when compared to conventional organic solvents.…”