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mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Multilayer adsorption equilibria of volatile organic compound mixtures and water on silica gel
  name:
    name part: Steffan, Dirk Guido Alfred
    name part: 1968-
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 1999
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xvi, 191 leaves : illustrations ; 28 cm.
  abstract: This study characterized how properties of the organic sorbates and water affect adsorption onto silica gel, and focused on modeling of binary and ternary mixture isotherms of these sorbates. Single component adsorption equilibria of three volatile organic compounds, n-hexane, benzene, trichloroethylene, and water, adsorption equilibria of these organic compounds in the presence of water, and binary mixtures of hexane-benzene (non-polar/non-polar) and hexane-trichloroethylene (non-polar/polar) both with and without water were examined. Using adsorption isotherms of single compounds, isotherms of binary and ternary mixtures were modeled. Adsorption isotherms of the single adsorbate systems were measured with the frontal analysis chromatography technique. They were BET-type II isotherms, which indicated minelayer followed by multilayer adsorption. The BET-analysis showed an increasing uptake at the minelayer with increasing polarity of the compounds. However adsorbent-adsorbate interactions of the organic sorbates were dominated by Van der Waals interactions and that Of water by hydrogen bonds, respectively. The adsorption equilibria of binary and ternary mixtures were measured using the same technique. Water adsorbed onto polar sites when coadsorbing with n-hexane or benzene, which were adsorbing onto nonpolar sites. The numbers of moles adsorbed were predicted with the two-site adsorption model. Competition for polar adsorption sites was observed for the adsorption of trichloroethylene in the presence of water, which was modeled with the real adsorbed solution theory (RAST). The adsorbed phase activity coefficients were above unity, indicating intermolecular interactions dominating the adsorbed phase properties. The presence of a second organic increased the uptake of the first organic sorbate in all experiments. Adsorbate-adsorbate interactions in the adsorbed phase were stronger for the nonpolar/polar than for the nonpolar/nonpolar mixture. The mixture isotherms o…
  note: by Dirk Guido Alfred Steffan.
  note: Vita.
  note: "Major Subject: Chemical Engineering".
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 1999.
  note: Includes bibliographical references (leaves 158-168).
  subject:
    topic: Major chemical engineering
  identifier: 99-57533 UMI
  identifier: http://proxy.library.tamu.edu/login
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    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 001016
    record change date: 20190325093634.0
    record identifier: in00001556403