Adsorption characteristics of toluene and naphthalene on silica gel under the subcritical and supercritical conditions using chromatographic techniques

Chang Ha Lee, Sang Hoon Byeon, Gerald D. Holder

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Chromatographic techniques were used for measuring the adsorption of toluene and naphthalene on silica gel packed beds under the supercritical and subcritical conditions at 301-318 K, 54-150 atm, and 0.3<NRe<7. The moment method was used to determine the equilibrium constants and rate parameters. The results showed a significant reduction of the adsorption equilibrium constant as the pressure changed from subcritical to supercritical; the axial dispersion coefficients at supercritical conditions were intermediate to those of what would be obtained in gases and liquids; in the pressure range where density fluctuations with concentration were large, axial dispersion was influenced by both natural convection and molecular diffusion; diffusion within the pores of the adsorbent was found to be the major resistance to adsorption. In addition to these parameters, partial molar volumes were determined from the chromatographic experiment and were found to agree well with the values reported in earlier work.

Original languageEnglish
Pages (from-to)683-694
Number of pages12
JournalJournal of Chemical Engineering of Japan
Volume29
Issue number4
DOIs
Publication statusPublished - 1996 Jan 1
Externally publishedYes

Fingerprint

Silica Gel
Toluene
Silica gel
Naphthalene
Equilibrium constants
Adsorption
Packed beds
Method of moments
Natural convection
Density (specific gravity)
Adsorbents
Gases
Liquids
naphthalene
Experiments

Keywords

  • Adsorption
  • Adsorption Equilibrium
  • Axial Dispersion
  • Diffusion
  • Partial Molar Volume
  • Supercritical Fluid Chromatography

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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abstract = "Chromatographic techniques were used for measuring the adsorption of toluene and naphthalene on silica gel packed beds under the supercritical and subcritical conditions at 301-318 K, 54-150 atm, and 0.3<NRe<7. The moment method was used to determine the equilibrium constants and rate parameters. The results showed a significant reduction of the adsorption equilibrium constant as the pressure changed from subcritical to supercritical; the axial dispersion coefficients at supercritical conditions were intermediate to those of what would be obtained in gases and liquids; in the pressure range where density fluctuations with concentration were large, axial dispersion was influenced by both natural convection and molecular diffusion; diffusion within the pores of the adsorbent was found to be the major resistance to adsorption. In addition to these parameters, partial molar volumes were determined from the chromatographic experiment and were found to agree well with the values reported in earlier work.",
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T1 - Adsorption characteristics of toluene and naphthalene on silica gel under the subcritical and supercritical conditions using chromatographic techniques

AU - Lee, Chang Ha

AU - Byeon, Sang Hoon

AU - Holder, Gerald D.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - Chromatographic techniques were used for measuring the adsorption of toluene and naphthalene on silica gel packed beds under the supercritical and subcritical conditions at 301-318 K, 54-150 atm, and 0.3<NRe<7. The moment method was used to determine the equilibrium constants and rate parameters. The results showed a significant reduction of the adsorption equilibrium constant as the pressure changed from subcritical to supercritical; the axial dispersion coefficients at supercritical conditions were intermediate to those of what would be obtained in gases and liquids; in the pressure range where density fluctuations with concentration were large, axial dispersion was influenced by both natural convection and molecular diffusion; diffusion within the pores of the adsorbent was found to be the major resistance to adsorption. In addition to these parameters, partial molar volumes were determined from the chromatographic experiment and were found to agree well with the values reported in earlier work.

AB - Chromatographic techniques were used for measuring the adsorption of toluene and naphthalene on silica gel packed beds under the supercritical and subcritical conditions at 301-318 K, 54-150 atm, and 0.3<NRe<7. The moment method was used to determine the equilibrium constants and rate parameters. The results showed a significant reduction of the adsorption equilibrium constant as the pressure changed from subcritical to supercritical; the axial dispersion coefficients at supercritical conditions were intermediate to those of what would be obtained in gases and liquids; in the pressure range where density fluctuations with concentration were large, axial dispersion was influenced by both natural convection and molecular diffusion; diffusion within the pores of the adsorbent was found to be the major resistance to adsorption. In addition to these parameters, partial molar volumes were determined from the chromatographic experiment and were found to agree well with the values reported in earlier work.

KW - Adsorption

KW - Adsorption Equilibrium

KW - Axial Dispersion

KW - Diffusion

KW - Partial Molar Volume

KW - Supercritical Fluid Chromatography

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