Adsorption from ternary liquid mixtures on silica gel of different mesoporosity

Goworek, J.; Nieradka, A.; Dąbrowski, A.

doi:10.1016/s0378-3812(97)00125-8

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…Some studies have measured adsorption from liquid mixtures using the liquid concentration changes upon adsorption, but these studies determined only relative adsorbed amounts , or assumed that one compound did not adsorb. , Depending on the hydrophobicity of a zeolite, the amount of H 2 O adsorbed from an aqueous organic mixture is potentially appreciable, and the organic concentration change alone does not accurately reflect the total organic mass adsorbed. The absolute adsorption of each compound in a liquid mixture can be determined for porous adsorbents using the nonadsorbing solvent method, , but this technique does not work well with nonideal mixtures.…”

Section: Introductionmentioning

confidence: 99%

Ethanol, Acetic Acid, and Water Adsorption from Binary and Ternary Liquid Mixtures on High-Silica Zeolites

Bowen

Vane

2006

Langmuir

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Adsorption isotherms were measured for ethanol, acetic acid, and water adsorbed on high-silica ZSM-5 zeolite powder from binary and ternary liquid mixtures at room temperature. Ethanol and water adsorption on two high-silica ZSM-5 zeolites with different aluminum contents and a high-silica beta zeolite were also compared. The amounts adsorbed were measured using a recently developed technique that accurately measures the changes in adsorbent/liquid mixture density and liquid concentration. This technique allows the adsorption of each compound in a liquid mixture to be measured. Adsorption data for binary mixtures were fit with the dual-site extended Langmuir model, and the parameters were used to predict ternary adsorption isotherms for each compound with reasonable accuracy. In ternary mixtures, acetic acid competed with ethanol and water for adsorption sites and reduced ethanol adsorption more than it reduced water adsorption.

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Section: Introductionmentioning

confidence: 99%

Ethanol, Acetic Acid, and Water Adsorption from Binary and Ternary Liquid Mixtures on High-Silica Zeolites

Bowen

Vane

2006

Langmuir

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“…Competitive adsorption between adsorbates in the liquid phase has been reported in the form of excess adsorption isotherms, − which only give relative amounts adsorbed. Dynamic chromatographic methods, such as frontal analysis and perturbation technique, have been used to determine the absolute amounts adsorbed.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Liquid Mixtures on Silicalite-1 Zeolite: A Density-Bottle Method

Falconer

Noble

2005

Langmuir

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A technique that measures the effective density of a zeolite after adsorption from the liquid phase was developed to measure the absolute amounts of liquid mixtures adsorbed on zeolites without using a nonadsorbing solvent. Since the fugacities of the adsorbing components in solution can be dramatically different with or without the addition of a nonadsorbing solvent, this technique measures mixture isotherms that can be used for analyzing pervaporation through zeolite membranes. A nonideal solution, methanol/acetone, was used as an example to show that its adsorption isotherms on silicalite-1 zeolite at 294 K differ dramatically from those measured with the nonadsorbing solvent method. The methanol/acetone fugacity ratio is different for the two methods because of different concentrations in the liquid phase. Methanol preferentially adsorbs on silicalite-1 at low methanol concentrations and acetone preferentially adsorbs at high methanol concentrations. The density bottle method was used to show that n-hexane preferentially adsorbs from n-hexane/3-methylpentane liquid mixtures, and at high n-hexane concentrations, essentially no 3-methylpentane adsorbs, as has been predicted previously by simulations. A larger molecule, 2,2-dimethylbutane, adsorbed so slowly at 294 K that silicalite had only 16% of saturation coverage after 370 h, but it was saturated after 1650 h; at 423 K, saturation was obtained in less than 24 h.

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“…However, the influence of changes in pore structure should be also taken into account. These effects were studied for adsorption from binary liquid mixtures on activated carbons [2][3][4] and silica gels [5,6]. Significant influence of pore sizes on the formation of the surface phase was confirmed.…”

Section: Introductionmentioning

confidence: 92%