Steady-state parallel plate apparatus for measurement of diffusion coefficient in supercritical carbon dioxide

Date

1999-02-01

Author

Tuan, DQ
Yener, Meryem Esra
Zollweg, JA
Harriott, P
Rizvi, SSH

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

210
views

0
downloads

A new, steady-state experimental system for measurement of the Fickian diffusion coefficients for solutes in supercritical carbon dioxide (SC-CO2) was designed and evaluated. Mass transfer between a Liquid solute and SC-CO2 was carried out in a parallel plate geometry where a porous metal sheet, immersed in the liquid phase, stabilized the interface. The SC-CO2 flowed over the porous metal sheet containing the liquid phase which was presaturated with CO2. The use of the porous metal sheet and a thin mobile layer allowed now rates high enough to achieve the necessary pressure drop to eliminate the commonly encountered, density-induced stagnation of SC-CO2 at the interface while avoiding surface-tension-related problems. The binary diffusion coefficients of methyl oleate in SC-CO2 at finite concentrations were measured at 40, 50, and 60 degrees C and at pressures ranging from 10.6 to 14.0 MPa. The experimentally measured values were 1.5-4.6 times lower than those predicted for infinite dilution and were found to decrease with solute concentration at constant pressure and temperature. This technique offers advantages over other commonly used methods in that the concentration dependence of diffusion coefficients in multicomponent systems can be studied.

Subject Keywords

Caffeine, Equation, Equilibria, co2, Benzene, Naphthalene, Liquid, Binary-mixtures, Fluid chromatography, Acid methyl-esters

URI

https://hdl.handle.net/11511/41822

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

DOI

https://doi.org/10.1021/ie9802055

Collections

Department of Food Engineering, Article

Suggestions

OpenMETU
Core

Highly Crystalline Poly(L-lactic acid) Porous Films Prepared with CO2-philic, Hybrid, Liquid Cell Nucleators Culhacioglu, Yagmur; Hasırcı, Nesrin; Dilek Hacıhabiboğlu, Çerağ (2019-12-18) Supercritical CO2 (scCO(2)) foaming of poly(L-lactic acid) composite films with liquid polyhedral oligomeric silsesquioxanes (PLLA-POSS) was carried out to obtain polymer matrices for drug delivery applications. Highly crystalline (>45%) PLLA generally requires high supercritical processing (saturation) temperatures close to its melting temperature (similar to 450 K) and pressures about or over 20 MPa for foaming with scCO(2). To decrease the saturation temperature and obtain ductile PLLA films with uniform...
Direct hydrothermal synthesis of palladium-incorporated silicate-structured mesoporous catalysts Sener, Canan; Doğu, Timur; Dogu, Guelsen (2007-01-01) Pd-Si-structured novel mesoporous nanocomposite catalytic materials, having quite high Pd/Si ratios, were synthesized by an acidic direct hydrothermal synthesis route. The nanocomposite catalytic materials were then characterized by XRD, XPS, EDS, nitrogen adsorption, and SEM techniques. Unlike MCM-41, the XRD patterns indicated a rather wide d((100)) band at a 2 theta value of about 1.9. The materials, with very high Pd/Si wt ratios between 1.43 and 2.66, were synthesized and had BJH surface area values be...
Design rules for suspending concentrated mixtures of solids in stirred tanks Ayrancı Tansık, İnci (2011-10-01) This study examines complete off-bottom suspension conditions for slurries containing mixtures of solids at a wide range of concentrations. Binary combinations of five different particles; bronze, two sizes of glass beads, ion exchange resin, and nickel were tested with two impellers: the Lightnin A310 and the down pumping 45 degrees PBT. The effect of particle size ratio and density ratio of the two solid phases on N(js) was investigated. Solids loadings were varied from 3 to 56 wt% (weight percent) with w...
Viscosity measurement and modeling of lipid supercritical carbon dioxide mixtures Yener, Meryem Esra; Rizvi, SSH; Harriott, P (1998-01-31) The viscosities of supercritical carbon dioxide (SC-CO2) containing different levels of methyl oleate and oleic acid were measured with a high pressure capillary viscometer. The SC-CO2-methyl oleate system was evaluated at 313.15, 323.15 and 333.15 K and 11.5, 13.7 and 15.5 MPa, respectively. The SC-CO2-oleic acid system was evaluated at 313.15 K and 20.5 and 30.0 MPa and 333.15 K and 30.0 MPa. The increase in SC-CO2 viscosity was as high as 15-20% at the maximum methyl oleate concentrations (4-5 wt%) and 6...
Optimization and field application of a filter pack system for the simultaneous sampling of atmospheric HNO3, NH3 and SO2 Karakas, D; Tuncel, Süleyman Gürdal (1997-06-01) Optimization and field application of a filter pack system for the simultaneous collection of atmospheric gas-phase HNO3, NH3 and SO2 have been studied. A Teflon prefilter was used to remove particulate matter. Nylon filter, oxalic-acid-treated Whatman 41 filter and sodium-carbonate-treated Whatman 41 filter were used for the collection of HNO3, NH3 and SO2, respectively. For the collection of gas-phase HNO3, nylon filters had better efficiency and capacity as compared to NaCl-impregnated Whatman 41 filters...

Citation Formats

D. Tuan, M. E. Yener, J. Zollweg, P. Harriott, and S. Rizvi, “Steady-state parallel plate apparatus for measurement of diffusion coefficient in supercritical carbon dioxide,” INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, pp. 554–561, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41822.