MEASUREMENT OF ADSORPTION ISOTHERMS AND SURFACE AREAS BY CONTINUOUS FLOW METHOD<sup>1</sup>

Eberly, P. E.

doi:10.1021/j100825a040

Cited by 41 publications

(17 citation statements)

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“…Frontal Inverse Gas Chromatography (FIGC) provides rapid determination of sorption isotherms with both kinetic and thermodynamic equilibrium. This has been demonstrated earlier by other investigators who used this method to study the sorption of various organic compounds on food and other systems (James and Phillips, 1954;Eberly, 1960;Eberly and Kimberlin 1961;Greenstein and Issenberg, 1967;Hussey and Purcher, 1976;Kucera et al, 1981). The application of FIGC to determine water vapor sorption isotherms for various food systems has been proposed recently (Gilbert, 1982;Tanaka, 1984;Paik, 1984).…”

Section: Introductionmentioning

confidence: 75%

Frontal Inverse Gas Chromatography as Used in Studying Water Sorption of Coffee Solubles

Apostolopoulos

Gilbert

1988

Journal of Food Science

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Frontal Inverse Gas Chromatography (FIGC) was used to study the combined effects of moisture, temperature, and particle size on the water sorption of freeze-dried coffee. A moisture increase from 0 to 95% RI-I resulted in typical anti-Langmuirian sorption isotherms. Lower temperatures favored sorption at equivalent water vapor pressures. The mesh size of coffee had only a slight effect on the amount of sorbed water at higher relative humidities but did affect FIGC. A comparison of the FIGC and static methods showed that the former was much faster and the sorption isotherms of the two methods were statistically different.

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Section: Introductionmentioning

confidence: 75%

Frontal Inverse Gas Chromatography as Used in Studying Water Sorption of Coffee Solubles

Apostolopoulos

Gilbert

1988

Journal of Food Science

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“…Eberly (12) has shown how the desorption curve can be used to make these c:hilations. The theory assumes instantaneous equilibrium between gaseous and adsorbed phases ancl absence of longitudinal cliff usion in the adsorbent column.…”

Section: Flow Methodsmentioning

confidence: 99%

Adsorption of hydrocarbon gas mixtures at high pressure

Mason

Cooke

1966

AIChE Journal

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An experimental investigation was made of the adsorption on silica gel of components from light hydrocarbon mixtures, and the results were used to test a multicomponent adsorption theory. Experimental methods included a volumetric technique to measure pure component adsorption and flow techniques for adsorption from mixtures. Although the majority of measurements was made at lOO"F., two mixtures were studied over the temperature range 40" to 160°F. Pressure was varied up to 1,800 Ib./sq.in.abs. The Brunauer-Emmett-Teller (BET) theory of adsorption, as extended to mixtures by Hill, wos tested against the experimental data and was found to be adequate for calculating adsorption from hydrocarbon mixtures of components heavier than methane. To account for nonideal behavior, the fugacity of each component in the gas and in the adsorbed phases was calculated by using the Benedict-Webb-Rubin equation of state. The differences in experimental and theoretical values for adsorption capacity were less than 10% for most of the conditions tested, but ranged up to about 25% for the highest pressures studied. Although the BET theory represents a simplified model of a complex process, it can be used to supply adsorption data for engineering application over ranges of pressure, temperature, and gas composition usually encountered in adsorption processing of natural gos mixtures.In the succeeding paragraphs, results of the adsorption capacity experiments are presented, and a multicomponent adsorption theory, capable of reproducing the experimen-countered in natural gas treating. App B icability of various Vol. '12, No. 6 A.1.Ch.E. Journal Journal November, 1966 Fig. 7. Effect of total pressure on silica gel adsorption of n-pentane and n-hexane from a complex gas mixture a t 100°F.

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“…Since any solvent might be adsorbed, severe sampling problems result. Eberly (1961) measured adsorption isotherms and surface areas by frontal analysis gas chromatography. Beebe et al (1966) evaluated this technique and compared it with the eluted pulse method for determination of isotherms and heats of adsorption of gases.…”

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confidence: 99%

Adsorption of Volatile Organic Compounds in Dehydrated Food Systems. 1. Measurement of Sorption Isotherms at Low Water Activities

Issenberg

Greenstein

Bošković

1968

Journal of Food Science

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SUMMARY Removal of water vapor during food dehydration results in losses of volatile compounds that contribute to flavor. The relative importance of diffusion and adsorption to retention of volatile components by solid food constituents during dehydration processes is not well known. A frontal analysis gas chromatographic apparatus has been developed to measure vapor‐solid adsorption at low adsorbate concentrations. Volatile compound is sorbed from the gas stream by an adsorbent in a system designed to minimize diffusion and kinetic effects. The system includes saturator chambers, which maintain constant concentration of adsorbate in the carrier gas stream, and a flame ionization detector. Data collected are presented as sorption isotherms. With microcrystalline cellulose powder as adsorbent and hexane and acetone vapors as adsorbates partial pressures in the range of 1 millitorr were produced and maintained. Resulting concentrations measured were in the range of micrograms adsorbate per gram adsorbent (ppm), orders of magnitude encountered in real dehydrated food systems.

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MEASUREMENT OF ADSORPTION ISOTHERMS AND SURFACE AREAS BY CONTINUOUS FLOW METHOD¹

Cited by 41 publications

References 0 publications

Frontal Inverse Gas Chromatography as Used in Studying Water Sorption of Coffee Solubles

Frontal Inverse Gas Chromatography as Used in Studying Water Sorption of Coffee Solubles

Adsorption of hydrocarbon gas mixtures at high pressure

Adsorption of Volatile Organic Compounds in Dehydrated Food Systems. 1. Measurement of Sorption Isotherms at Low Water Activities

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MEASUREMENT OF ADSORPTION ISOTHERMS AND SURFACE AREAS BY CONTINUOUS FLOW METHOD1

Cited by 41 publications

References 0 publications

Frontal Inverse Gas Chromatography as Used in Studying Water Sorption of Coffee Solubles

Frontal Inverse Gas Chromatography as Used in Studying Water Sorption of Coffee Solubles

Adsorption of hydrocarbon gas mixtures at high pressure

Adsorption of Volatile Organic Compounds in Dehydrated Food Systems. 1. Measurement of Sorption Isotherms at Low Water Activities

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MEASUREMENT OF ADSORPTION ISOTHERMS AND SURFACE AREAS BY CONTINUOUS FLOW METHOD¹