Heterogeneous phase equilibrium in the ethane-n-dodecane system

Abstract

of viscosity given by the present correlation and the values computed by Dean and Stiel's (3)equations. This may be attributed to inherent errors in the method of determination of the pseudocritical constants (3). In Figure 1, a regular trend is noticed between the limits of the two pure components. This clearly brings out the effect of mixture composition on viscosity of the Freon-12-Freon-22 vapor mixture system. CONCLUSIONThe present correlation facilitates design of engineering systems, as viscosity information on pure Freon-12 and Freon-22 vapors and their mixtures may be obtained readily. The determination of viscosity, however, requires an accurate knowledge of the temperature-dependence of viscosity at zero density. For engineering purposes, it may be convenient to use the atmospheric viscosity values. These atmospheric viscosity values may be calculated for pure components by the correlation of Witzell and Johnson (20) and for mixtures by Herning and Zipperer's (4) equation or by Wilke's (19) equation.

Phase equilibria for supercritical fluid process design

“…A more complete picture of the phase equilibria, especially the phase diagram, can be obtained with high-pressure view cells, sometimes equipped with sampling valves for all phases (Rodrigues et al, 1968;Lee and Kohn, 1969;Kalra et al, 1978;Tiffin et al, 1978;Kohn et al, 1980;Legret et al, 1980;Li et al, 198 1 ;Meskel-Lesavre et al, 198 1 ;Gasem and Robinson, 1985;Hsu et al, 1985;Nagarajan and Robinson, 1986;Anderson et al, 1986;Bufkin et al, 1986). A very early study (Chappelear and Elgin, 1961) examined seven organic liquids in SCF Freon 13.…”

Phase-equilibriums behavior of systems carbon dioxide-n-eicosane and carbon dioxide-n-decane-n-eicosane

“…The apparatus used in this study is the same as that used in earlier studies (3)(4)(5). Briefly, a P-V-T apparatus was used in conjunction with a viewable 10-cm3 glass equilibrium cell.…”

Carbon Dioxide Solubility Enhancement through Silicone Functionalization: “CO2-philic” Oligo(dimethylsiloxane)-substituted Diphosphonates∗

“…Without exception, the product compounds were liquids under ambient conditions, thereby precluding the facile application of the dynamic extraction approach to measuring solubility employed in our studies of TMSP esters (30). Instead, the affinity of each of the compounds for CO 2 was evaluated by measuring the amount of CO 2 that partitions into each at pressures from 30 to 90 bar at a constant temperature (40 C) (35). Figure 2 shows the amounts of CO 2 incorporated into the ligand-rich phase in each case, a direct reflection of the compatibility of the ligands with CO 2 .…”