Predictive correlation for binary diffusion coefficients in dense carbon dioxide

Funazukuri, Toshitaka; Ishiwata, Yoshihisa; Wakao, Noriaki

doi:10.1002/aic.690381109

Cited by 101 publications

(58 citation statements)

References 36 publications

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“…where N AV is Avogadro number and v 0 was calculated from the equation proposed by Funazukuri et al [17]. The effective hard-sphere diameter of solute(2) was calculated by σ σ σ σ (8) where σ vw is the van der Waals diameter estimated by the method of Bondi [18].…”

Section: Correlationmentioning

confidence: 99%

Diffusion coefficients of naphthalene and dimethylnaphthalene in supercritical carbon dioxide

Higashi

Iwai

Takahashi

et al. 1998

Fluid Phase Equilibria

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A new experimental apparatus based on a pseudo-steady state solid dissolution method has been designed to measure the diffusion coefficients of supercritical carbon dioxide(1)-naphthalene(2) and supercritical carbon dioxide(1)-dimethylnaphthalene isomers (2) systems. The diffusion coefficients were measured at 308.2 K. In order to establish the validity of this method and the performance of the apparatus, the experimental results of the diffusion coefficients of naphthalene in supercritical carbon dioxide were compared with the literature data measured by other methods. The decrease of diffusion coefficient of naphthalene was observed near the critical point of carbon dioxide. The diffusion coefficients of 2,6-dimethylnaphthalene (2,6-DMN) and 2,7-dimethylnaphthalene (2,7-DMN) show almost the same values. The diffusion coefficients of these isomers are about 10% lower than those of naphthalene.

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Section: Correlationmentioning

confidence: 99%

Diffusion coefficients of naphthalene and dimethylnaphthalene in supercritical carbon dioxide

Higashi

Iwai

Takahashi

et al. 1998

Fluid Phase Equilibria

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“…Data at 333.15 and 343.15 K, excluding those deviating from the background values (marked with "a" in Table 1). 12 and myristic acid ethyl ester (X, 308, 313 and 318 K) in the literature. 13 The legend for the present data is the same as in Fig.…”

Section: 13mentioning

confidence: 99%

“…22 Figure 2 shows the D12/T vs. CO2 viscosity for (a) myristoleic acid, and (b) myriostoleic acid methyl ester measured in this study and a previous study, 12 together with the literature data of myristic acid ethyl ester. 13 The D12 values in the latter two studies 12,13 were measured by the Taylor dispersion method. We have demonstrated the validity of the correlation in the following equation for a variety of compounds:…”

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confidence: 99%

Measurements of Binary Diffusion Coefficients, Retention Factors and Partial Molar Volumes for Myristoleic Acid and Its Methyl Ester in Supercritical Carbon Dioxide

et al. 2006

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IntroductionRecently, the chromatographic technique has been a focus of attention as an effective tool to measure various thermodynamic properties of fluids, 1 such as the diffusion coefficient, vapor pressure, partition coefficient, solubility and adsorption isotherm. As well as the properties under ambient conditions, the chromatographic technique is useful for the measurements in supercritical fluids.The authors have applied the technique of supercritical fluid chromatography, referred to as the chromatographic impulse response (CIR) method, to simultaneous measurements of the binary diffusion coefficient, D12, and the retention factor, k, in supercritical fluids. 2-5This technique is a type of transientresponse method in which a solute species is pulse-injected to a polymer-coated diffusion column, and the two parameters are determined by fitting the calculated response curve to the measured one. The Taylor dispersion method, which is also a type of transient-response method, has been commonly employed to measure D12 values in the gaseous, supercritical and liquid phases with an uncoated diffusion column. In particular, most D12 data in supercritical fluids were measured by the Taylor dispersion method. However, this method is not adequate for low-volatility and/or polar compounds. 2The authors measured the D12 and k values for a variety of fatty acids and their derivatives, i.e. fatty acids having carbon numbers of 18 to triglycerides having molecular weights, M, of over 1000, in supercritical carbon dioxide by the CIR method. [2][3][4][5] However, accurate data for compounds having relatively short chain lengths are scarcely available in the literature. Thus, in this study the CIR method was employed to measure the binary diffusion coefficients and retention factors for myristoleic acid and its methyl ester in supercritical carbon dioxide, and the partial molar volumes were estimated from the retention factor and CO2 density. The validities of the predictive correlations for the D12 values were also tested. TheoryThe theory for the CIR technique was described previously in detail, 2,4,5 and is briefly mentioned. When a tracer is pulseinjected into a fully developed laminar flow in a coated cylindrical column, the cross-sectional average concentration, Ca(t), at the outlet of the column is given aswhereand m is the amount of the tracer species, R the radius, t the time, L the distance from the inlet of the diffusion column, ua the average fluid velocity, k the retention factor, and D12 the infinite dilution binary diffusion coefficient of the tracer species, respectively. When ua is measured, D12 and k can be simultaneously determined by minimizing the root-mean-square (rms) error, ε, defined as follows for the measured Cexp(t) and calculated Ca(t) curves:

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“…1) Advantages of supercritical fluid extraction include favourable mass transport properties and minimisation of waste solvent generation. 4) A number of studies have demonstrated the extraction of metal ions present in aqueous solutions by supercritical CO 2 , but understanding of the rate of the extraction process is often unknown. 2,[5][6][7][8][9] The feasibility of extracting uranyl ions from nitric acid solutions may have important applications in nuclear waste management.…”

Section: Introductionmentioning

confidence: 99%

Modelling of the Extraction of Uranium with Supercritical Carbon Dioxide.

Clifford¹,

Shu²,

Smart³

et al. 2001

J. Nucl. Sci. Technol.

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A model is presented for the analysis of the results of extraction of uranium in a flow system by supercritical fluid modified with tributylphosphate from a nitric acid matrix, in which the extraction is not limited by the solubility of the uranium species. The model used is that of diffusion out of a sphere into a medium in which the extracted uranium is infinitely dilute. Although not a completely accurate representation of the liquid-supercritical fluid system, the model is shown to be a reasonable representation and some conclusions discussed.

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Predictive correlation for binary diffusion coefficients in dense carbon dioxide

Cited by 101 publications

References 36 publications

Diffusion coefficients of naphthalene and dimethylnaphthalene in supercritical carbon dioxide

Diffusion coefficients of naphthalene and dimethylnaphthalene in supercritical carbon dioxide

Measurements of Binary Diffusion Coefficients, Retention Factors and Partial Molar Volumes for Myristoleic Acid and Its Methyl Ester in Supercritical Carbon Dioxide

Modelling of the Extraction of Uranium with Supercritical Carbon Dioxide.

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