Adsorption isotherms and overloaded elution profiles of phenyl-n-alkanes on porous carbon in liquid chromatography

Diack, Moustapha; Guiochon, Georges

doi:10.1021/la00042a016

Cited by 16 publications

(10 citation statements)

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“…These responses are obtained because for a Langmuir isotherm concentration velocities increase with increasing concentration (DeVault, 1943). In contrast, non-Langmuirian adsorption behavior results in increased retention time with increased column loading in overload elution chromatography (Svoboda, 1990;Diack and Guiochon, 1992). Diffuse fronts are also generated at some overload concentrations.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Chromatography of .beta.-Lactoglobulins A and B: Non-Langmuirian Behavior

Jen¹,

Pinto²

1995

Ind. Eng. Chem. Res.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Chromatography of .beta.-Lactoglobulins A and B: Non-Langmuirian Behavior

Jen¹,

Pinto²

1995

Ind. Eng. Chem. Res.

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“…We calculate effluent concentration profiles in a liquid chromatography column for mixtures of phenyl‐ n ‐alcanes in the system acetonitrile/graphitized carbon at 50°C, reported by Diack and Guiochon . The adsorption of these solutes is well represented by the combined quadratic plus Langmuir model

\begin{matrix} q_{i}^{0} (c_{i}^{0}) = q_{i 1}^{sat} \frac{c_{i}^{0} true(b_{i 1} + 2 b_{i 2} c_{i}^{0} true)}{1 + b_{i 1} c_{i}^{0} + b_{i 2} {c_{i}^{0}}^{2}} + q_{i 2}^{sat} \frac{b_{i 3} c_{i}^{0}}{1 + b_{i 3} c_{i}^{0}}, i = 1, \dots, N \end{matrix}

with modified spreading pressure

Π (c_{i}^{0}) = q_{i 1}^{sat} \ln true[1 + b_{i 1} c_{i}^{0} + b_{i 2} {c_{i}^{0}}^{2} true] + q_{i 2}^{sat} \ln true[1 + b_{i 3} c_{i}^{0} true]

Figure shows the single component adsorption i...…”

Section: Dynamic Modeling Of Fixed‐bed Adsorbers Using Iastmentioning

confidence: 99%

“… Single component adsorption isotherms of phenyl‐ n ‐alcanes in the acetonitrile/graphitized carbon system at 50°C taking the parameters of Table as reported by Diack and Guiochon …”

Section: Dynamic Modeling Of Fixed‐bed Adsorbers Using Iastmentioning

confidence: 99%

A method for efficiently solving the IAST equations with an application to adsorber dynamics

2012

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The Ideal Adsorbed Solution Theory (IAST) developed by Myers and Prausnitz and Radke and Prausnitz provides a powerful tool to calculate multicomponent adsorption equilibria based on single component adsorption isotherms. An important aspect of the application of IAST is that it requires the solution of an implicit algebraic system of equations. Analytical solutions can be derived only for few simple single component isotherm models. This work offers a new concept to solve the equations of the IAST for mixtures of N components characterized by nondecreasing single component adsorption isotherm behavior. The approach is based on transforming the algebraic system of IAST equations to a system of ODEs with one specified initial value. This work also provides analytical expressions for the partial derivatives of the predicted adsorption equilibria and increases the efficiency of numerical calculations for fixed-bed adsorber dynamics. The strength of the solution method is illustrated in case studies. Figure 3. Trajectories for the 10 component case of Example 3.(a): Solution orbit. and (b): inset of (a) for the low-pressure region.

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“…Chromatography, is firmly established as an essential technique for physicochemical investigations [9][10][11][12][13][14], however, research by the liquid chromatographic method on adsorption of binary mobile phases solutions, has not considered the most used in the HPLC practice stationary phases: hydrophobic and hydrophilic silicagel. HPLC can be successfully applied to determine adsorption isotherms [6,7,9,12,[15][16][17], by different procedures [18] which lead to practically identical results [19,20] and it has been demonstrated that in the case of adsorbents used in HPLC, the derived adsorption data are in good agreement [8,9,18,21] with those obtained by using the static methods [2,22] for adsorption studies. A common feature of the HPLC procedures is speed.…”

Section: Introductionmentioning

confidence: 99%

“…For solid-liquid systems the method based on retention data was established in the relevant work of Kov~its [24] and the investigations [25][26][27] on adsorption from binary mixtures in RP-HPLC are particularly noteworthy. At present, Guiochon [6,7,[17][18][19] has maximized the precision of isotherm determinations under the most accurate conditions, together with excellent theoretical studies [6,10,18,19,[28][29][30][31]. Our goal in the present work was to obtain adsorption isotherms point by point from peak profiles combining the last two techniques in a way easy to carry out.…”

Section: Introductionmentioning

confidence: 99%

HPLC study of the adsorption from solutions on two silicagels

1997

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SummaryIn this paper, we report and discuss the adsorption isotherms of hydro-organic mixtures and of compounds used as mobile phase in reversed phase and normal phase high performance liquid chromatography (RP-HPLC and NP-HPLC, respectively). This work is the first attempt to study the solid-liquid interface between two types of chromatographic silica surfaces and pure organic adsorbates from water and from organic eluents by HPLC. Frequently, among the dynamic techniques the method of choice for the measurement of an adsorption isotherm is frontal analysis. We suggest here the combination of the technique based on peak asymmetry calibration and peak profiles, which allows calculations directly from integration data. The group of systems studied permits the analysis of the intermolecular interactions on the silica surface. Particular attention was given to the system methanol-water and the measurement of the adsorption of n-octanol from methanol on RP-silica was also carried out.

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Adsorption isotherms and overloaded elution profiles of phenyl-n-alkanes on porous carbon in liquid chromatography

Cited by 16 publications

References 0 publications

Nonlinear Chromatography of .beta.-Lactoglobulins A and B: Non-Langmuirian Behavior

Nonlinear Chromatography of .beta.-Lactoglobulins A and B: Non-Langmuirian Behavior

A method for efficiently solving the IAST equations with an application to adsorber dynamics

HPLC study of the adsorption from solutions on two silicagels

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