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The Resource Adsorption of moisture and indoor pollutants on a mixed-adsorbent, by Song-Yng Lee

Adsorption of moisture and indoor pollutants on a mixed-adsorbent, by Song-Yng Lee

Creator
Summary
A theoretical study by Collier (1986) showed that if the shape of water adsorption isotherm on a material is between the shapes on molecular sieve 13X and silica gel, the use of this material in the desiccant dehumidifier would lower installation and operating costs of a desiccant cooling system. In order to obtain such a shape of the water adsorption isotherm, a desiccant manufacturer has prepared an adsorbent by mixing a silica gel, molecular sieve 13X, and a hydrophobic molecular sieve. The hydrophobic molecular sieve was added into the mixture to enhance the pollutant adsorption capacities of the mixture. The objective of this study was to investigate adsorption characteristics of water vapor and some selected air pollutants on this mixed-adsorbent coated aluminum foil under dynamic conditions. The breakthrough behavior of water and toluene from the mixed-adsorbent bed showed some interesting characteristics. Once these compounds broke through the bed, their concentrations at the bed outlet increased sharply to about 70% of the inlet concentration, which was followed by a plateau region, where the concentration of these compounds remained almost the same for a while. Following the plateau region, the outlet concentration slowly approached that of the inlet concentration. This phenomenon was observed at all three temperatures and humidities that were employed while studying water vapor and toluene adsorption. The breakthrough curves for 1,1,1-trichloroethane and carbon dioxide did not exhibit this behavior. The adsorption capacity of the mixed adsorbent for water vapor and individual pollutants decreased significantly when present in a mixture with other compounds compared to their pure component capacities. A mathematical model was developed to describe the adsorption of a pure compound in a packed bed adsorber. The model was then modified to predict the breakthrough of a compound from the desiccant matrix. In the model, the linear, the Langmuir, the Freundlich and the Hines et al. isotherms were used. The linear isotherm model provided the best fit of the data for these systems. The overall mass transfer coefficients for toluene, 1,1,1-trichloroethane and carbon dioxide for adsorption in the mixed adsorbent bed were found to be 40 min$\sp{-1}$, 50 min$\sp{-1}$, and 20 min$\sp{-1}$, respectively
Language
eng
Work
Publication
Extent
xvi, 179 leaves
Note
  • Typescript
  • Vita
Instance
Label
Adsorption of moisture and indoor pollutants on a mixed-adsorbent
Title
Adsorption of moisture and indoor pollutants on a mixed-adsorbent
Statement of responsibility
by Song-Yng Lee
Title variation
Adsorption of moisture & indoor pollutants
Creator
Subject
Language
eng
Summary
A theoretical study by Collier (1986) showed that if the shape of water adsorption isotherm on a material is between the shapes on molecular sieve 13X and silica gel, the use of this material in the desiccant dehumidifier would lower installation and operating costs of a desiccant cooling system. In order to obtain such a shape of the water adsorption isotherm, a desiccant manufacturer has prepared an adsorbent by mixing a silica gel, molecular sieve 13X, and a hydrophobic molecular sieve. The hydrophobic molecular sieve was added into the mixture to enhance the pollutant adsorption capacities of the mixture. The objective of this study was to investigate adsorption characteristics of water vapor and some selected air pollutants on this mixed-adsorbent coated aluminum foil under dynamic conditions. The breakthrough behavior of water and toluene from the mixed-adsorbent bed showed some interesting characteristics. Once these compounds broke through the bed, their concentrations at the bed outlet increased sharply to about 70% of the inlet concentration, which was followed by a plateau region, where the concentration of these compounds remained almost the same for a while. Following the plateau region, the outlet concentration slowly approached that of the inlet concentration. This phenomenon was observed at all three temperatures and humidities that were employed while studying water vapor and toluene adsorption. The breakthrough curves for 1,1,1-trichloroethane and carbon dioxide did not exhibit this behavior. The adsorption capacity of the mixed adsorbent for water vapor and individual pollutants decreased significantly when present in a mixture with other compounds compared to their pure component capacities. A mathematical model was developed to describe the adsorption of a pure compound in a packed bed adsorber. The model was then modified to predict the breakthrough of a compound from the desiccant matrix. In the model, the linear, the Langmuir, the Freundlich and the Hines et al. isotherms were used. The linear isotherm model provided the best fit of the data for these systems. The overall mass transfer coefficients for toluene, 1,1,1-trichloroethane and carbon dioxide for adsorption in the mixed adsorbent bed were found to be 40 min$\sp{-1}$, 50 min$\sp{-1}$, and 20 min$\sp{-1}$, respectively
Additional physical form
Also available on the Internet.
Cataloging source
MUU
http://library.link/vocab/creatorDate
1968-
http://library.link/vocab/creatorName
Lee, Song-Yng
Degree
Ph. D.
Dissertation year
1997.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri-Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
bibliography
http://library.link/vocab/subjectName
  • Humidity
  • Drying agents
  • Adsorption
  • Dampness in buildings
  • Air conditioning
  • Indoor air pollution
  • Toluene
Target audience
specialized
Label
Adsorption of moisture and indoor pollutants on a mixed-adsorbent, by Song-Yng Lee
Instantiates
Publication
Note
  • Typescript
  • Vita
Bibliography note
Includes bibliographical references (leaves 115-119)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
42190945
Dimensions
29 cm
Dimensions
unknown
Extent
xvi, 179 leaves
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations
Specific material designation
remote
Label
Adsorption of moisture and indoor pollutants on a mixed-adsorbent, by Song-Yng Lee
Publication
Note
  • Typescript
  • Vita
Bibliography note
Includes bibliographical references (leaves 115-119)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
42190945
Dimensions
29 cm
Dimensions
unknown
Extent
xvi, 179 leaves
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations
Specific material designation
remote

Subject

Genre

Library Locations

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      2908 Lemone Blvd, Columbia, MO, 65211, US
      38.919360 -92.291620

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