Analysis of retrograde behavior and the cross-over effect in supercritical fluids

Chimowitz, Eldred H.; Kelley, F.D.; Muñoz, Francisco

doi:10.1016/0378-3812(88)80102-x

Cited by 42 publications

(23 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is consistent with the crossover phenomena generally reported for supercritical carbon dioxide extraction of seed oils (Ö zkal et al, 2005Xu et al, 2008;Liu et al, 2009). Crossover pressure is a pressure value at which the effect of temperature on the solubility changes (Chimowitz et al, 1988).…”

Section: Solubility Measurement and Data Correlationsupporting

confidence: 90%

See 1 more Smart Citation

Mathematical modelling of soybean oil solubility in supercritical carbon dioxide

Jokić

Svilović

Zeković

et al. 2011

Int J of Food Sci Tech

View full text Add to dashboard Cite

The solubility of soybean oil in supercritical carbon dioxide has been determined in the pressure range of 100-300 bar and in the temperature range of 313-323 K. The obtained values (from 0.0005 to 0.02055 g L )1 ) have been correlated using four different empirical equations proposed correspondingly by Chrastil, del Valle and Aquilera, Adachi and Lu and Sparks et al. Since the Sparks et al. equation provided the lowest average absolute relative deviation (AARD) (10.25%) than other models in the examined experimental range, a modified equation of Sparks et al. model was developed for predicting the solubility of soybean oil in supercritical carbon dioxide as a function of temperature and density. An improved equation showed the lowest deviation (2.15%) between experimental data than the other empirical equations considered in this study. The proposed equation was also applied for correlating the solubility of linoleic acid (AARD was 2.40%).

show abstract

Section: Solubility Measurement and Data Correlationsupporting

confidence: 90%

“…, 2009). Crossover pressure is a pressure value at which the effect of temperature on the solubility changes (Chimowitz et al. , 1988).…”

Section: Resultsmentioning

confidence: 99%

Mathematical modelling of soybean oil solubility in supercritical carbon dioxide

Jokić

Svilović

Zeković

et al. 2011

Int J of Food Sci Tech

View full text Add to dashboard Cite

show abstract

“…In the near-critical region of a supercritical fluid in contact with a solute, one interesting property of the system is the existence of retrograde behavior. This has been the subject of a number of our recent papers and those of others, (Chimowitz et al, 1988;Kelley and Chimowitz, 1989;Debenedetti and Kumar, 1988;Johnston et al, 1987;Schaeffer et al, 1988). The allied crossover effect phenomenon, a situation in which certain components in the system are retrograde while others are not, was proposed by Chimowitz and Pennisi (1986) as the basis for novel molecular separation techniques using a staged processing concept.…”

Section: Introductionmentioning

confidence: 78%

Near‐critical phenomena and resolution in supercritical fluid chromatography

Kelley

Chimowitz

1990

AIChE Journal

View full text Add to dashboard Cite

The analysis in this paper shows the relationship between molecular resolution in supercritical fluid chromatography (SFC), and certain divergent thermodynamic properties of solutes dissolved in near-critical fluids. This divergence is most pronounced in the near-critical regime, leading to the hypothesis that this region provides most promise for heightened molecular resolution, which lies at the heart of analytical and separation technologies.A thermodynamic model for representing capacity factor data in SFC is proposed, spanning a wide density range. The model uses a perturbed hard sphere equation for the fluid phase and lattice concepts for the stationary phase. In addition, data are presented for a number of systems and discussed in terms of the analysis provided. For an isomeric system, the data shows that resolution between species increases with the onset of retrograde behavior, resulting in a distinct maximum point.

show abstract

“…The existence of a crossover region in multicomponent systems, where a temperature change will affect the solubility of mixture components in opposing ways has been proposed as a means to separate solid mixtures [46]. However, in liquid mixtures the separation efficiency will be determined by the partition coefficients of the mixture components.…”

Section: Implications For Fractionationmentioning

confidence: 99%

Solubility behavior of ternary systems of lipids in supercritical carbon dioxide

Üstündağ

Temelli

2006

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

Analysis of retrograde behavior and the cross-over effect in supercritical fluids

Cited by 42 publications

References 17 publications

Mathematical modelling of soybean oil solubility in supercritical carbon dioxide

Mathematical modelling of soybean oil solubility in supercritical carbon dioxide

Near‐critical phenomena and resolution in supercritical fluid chromatography

Solubility behavior of ternary systems of lipids in supercritical carbon dioxide

Contact Info

Product

Resources

About