Supercritical Fluid−Solid Phase Equilibria Calculations by Cubic Equations of State and Empirical Equations:  Application to the Palmitic Acid + Carbon Dioxide System

2004 ◽  
Vol 49 (3) ◽  
pp. 435-438 ◽  
Author(s):  
Dolores Gordillo ◽  
Clara Pereyra ◽  
Enrique J. Martínez de la Ossa
Keyword(s):  
Carbon Dioxide ◽  
Phase Equilibria ◽  
Palmitic Acid ◽  
Supercritical Fluid ◽  
Equations Of State ◽  
Solid Phase ◽  
Empirical Equations

scholarly journals Water-carbon dioxide solid phase equilibria at pressures above 4 GPa

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
E. H. Abramson ◽  
O. Bollengier ◽  
J. M. Brown
Keyword(s):  
Carbon Dioxide ◽  
Phase Equilibria ◽  
Solid Phase

Supercritical Fluid Extraction of Aflatoxin M1 from Beef Livert†

1997 ◽  
Vol 60 (6) ◽  
pp. 698-700 ◽  
Author(s):  
SCOTT L. TAYLOR ◽  
JERRY W. KING ◽  
JUDITH I. GREER ◽  
JOHN L. RICHARD
Keyword(s):  
Carbon Dioxide ◽  
Organic Solvent ◽  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
High Performance ◽  
Methylene Chloride ◽  
Solid Phase ◽  
Aflatoxin M1 ◽  
Organic Modifiers ◽  
Fluid Extraction

Supercritical fluid extraction (SFE) and a pressurized-fluid-extraction process were applied for the removal of aflatoxin M1 from beef liver samples. Various pressures, temperatures, quantity of supercritical carbon dioxide, and organic modifiers were investigated to optimize the extraction methods. Organic modifier was found to be essential for quantitative recovery of aflatoxin M1. Extracts were cleaned up by solid-phase extraction and were analyzed via high-performance liquid chromatography coupled with fluorescence detection of the trifluoroacetic acid derivative. Solvent-modified carbon dioxide SFE achieved recoveries comparable to an AOAC-approved method involving organic solvent extraction. SFE allowed the traditional amounts of sample and organic solvent to be reduced. Also, the supercritical-fluid extraction permitted the use of carbon dioxide modified with acetonitrile: methanol (2:1) to replace methylene chloride as the organic solvent for the extraction step.

Fluid Phase Equilibria Correlation for Carbon Dioxide +1-Heptanol System with Cubic Equations of State

2012 ◽  
Vol 51 (34) ◽  
pp. 11284-11293 ◽  
Author(s):  
Catinca Secuianu ◽  
Junwei Qian ◽  
Romain Privat ◽  
Jean-Noël Jaubert
Keyword(s):  
Carbon Dioxide ◽  
Phase Equilibria ◽  
Equations Of State ◽  
Fluid Phase ◽  
Fluid Phase Equilibria

Experimental high-pressure phase equilibria of carbon dioxide/n-alkanes mixtures and model-parameters for solid-phase obtained from DSC thermograms

2020 ◽  
Vol 526 ◽  
pp. 112802
Author(s):  
Wilfred A.G. Jaramillo ◽  
Vinicius M. da Silva ◽  
Rafael P. do Carmo ◽  
Arthur J.O. Braga ◽  
Papa M. Ndiaye ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Phase Equilibria ◽  
Solid Phase ◽  
High Pressure Phase ◽  
Model Parameters ◽  
Pressure Phase ◽  
Dsc Thermograms

Dynamic solubility measurement of substances in supercritical fluids

2019 ◽  
Vol 60 (12) ◽  
pp. 96-103
Author(s):  
Lenar Yu. Yarullin ◽  
◽  
Farizan R. Gabitov ◽  
Insaf I. Zamaliev ◽  
Lyudmila Y. Sabirova ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Phase Equilibria ◽  
Supercritical Fluid ◽  
Supercritical Fluids ◽  
Raw Materials ◽  
Plant Materials ◽  
Fluid Media ◽  
Tea Leaf ◽  
Supercritical Carbon

The study of currently known methods and devices for processing plant materials has shown that during the study period, the greatest interest (about 31%) of patent holders is manifested in increasing the yield of extractive substances. If we take as an example a tea leaf, then indeed, the formation of conditions for a more complete release of the target components into the aqueous phase during brewing can provide a more profitable and economical consumption of tea raw materials. The study of the thermodynamic principles of the use of supercritical fluid media and carbon dioxide, in particular, in the processing of plant materials and the processing of tea raw materials, as well as the development of methods for intensifying mass transfer to the aqueous phase when “brewing” tea leaves, are uniquely relevant tasks. An important section of thermodynamics is the concept of phase equilibria in systems of different composition. And one of the key characteristics of phase equilibria is such a thing as the solubility of a substance, including in supercritical fluid media. Since solutions of substances in supercritical fluids are diluted, the dependence of the solubility of substances on temperature, pressure, and density of a pure solvent near its critical point is of practical interest. The results of experimental studies of measuring the solubility of tannin in supercritical carbon dioxide by the dynamic method at a temperature of 308 and 333 K, in the pressure range from 8 to 26 MPa, are presented. The data obtained, firstly, indicate a low solubility of tannin in supercritical carbon dioxide, which is a positive moment for the implementation of the tea leaf pretreatment process in order to improve its biological potential, and secondly, a clear suppression of isolines is observed, which in turn indicates the presence of crossover behavior on solubility isotherms. Based on the results of the obtained experimental data on the solubility of tannin in supercritical carbon dioxide, a mathematical description of the solubility of tannin was carried out by the Peng-Robinson equation of state.

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