Supercritical Fluids and Gas-Expanded Liquids

CO2-Expanded Alkyl Acetates: Physicochemical and Molecular Modeling Study and Applications in Chemical Processes

“…As it has been previously stated, 62 GXLs are fluids with more free volume than the pure liquids, which contributes to their increased transport properties already observed. 63 Higher f OCC are observed in isoamyl acetate than for the other alkyl acetates at the same x CO 2 , which can be explained by the fact that interspaces in branched alkanes are occupied in part by the branched alkyl groups leaving less free volume between molecules.…”

“…This behavior observed concerning density and expansion can be explained by an increase in free volume observed in GXLs 40 that has been attributed to the intermolecular spaces of the solvent that can host the CO 2 to some extent (x CO 2 ≈ 0.7), increasing the density of the mixture; after this point, interstices between solvent molecules cannot receive any more CO 2 , and thus the mixture experiences a rapid volume expansion. 40,63 The amount of CO 2 that the system can accommodate highly depends on temperature, as the gas solubility decreases and the molecular mobility increases.…”

Pressurized carbon dioxide combined with aqueous ethanol as cosolvent induces efficient delipidation of porcine retina for their use as bioscaffolds

“…A one-phase system prevents direct contact between the tissue and the liquid organic solvent, which would cause cytotoxic effects, and enhances diffusion of the otherwise liquid solvent into the solid sample. In the case of pressurized CO2 mixtures, the pressure was kept the same as for neat CO2 for comparison, and because there is very little information in the literature about how solvation power of one-phase pressurized mixtures changes with pressure [41].…”

Rana chensinensis Ovum Oil Based on CO2 Supercritical Fluid Extraction: Response Surface Methodology Optimization and Unsaturated Fatty Acid Ingredient Analysis

“…In addition, the density of supercritical fluid is 100–1000 times that of gas, which is close to liquid, so it has similar solubility to liquid. However, its diffusion coefficient is 10–100 times that of liquid, which leads to it having a strong penetration ability into RCO, so CO 2 -SFE can obtain an efficient separation effect [ 20 ]. The surface response strategy is used to analyze the influence of various factors (for example, pressure, flow, temperature, and time) in the CO 2 -SFE process on the yield of RCOO, which can further improve the efficiency of RCOO with a relatively small number of experiments and save the development and production costs [ 21 , 22 , 23 ].…”