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Absorption and desorption of CO2 and CO in alkanolamine systems Jamal, Aqil
Abstract
Absorption and desorption of carbon dioxide (CO₂) and carbon monoxide (CO) in aqueous alkanolamine solutions are modeled and important kinetic and physical property data are obtained using novel experimental methods. The model is based on the principle of diffusional mass transfer accompanied with fast to very slow chemical reactions in the liquid phase. Fast reactions are represented by CO₂ absorption/desorption in aqueous alkanolamines and slow reactions are represented by CO absorption in aqueous diethanolamine (DEA). The experiments for CO₂ absorption and desorption were conducted in a novel hemispherical contactor designed and developed in this work. The absorption experiments were conducted at near atmospheric pressure using pure CO₂ saturated with water at 293 to 323 K with initially unloaded solutions. The desorption experiments were performed at 333 to 383 K for CO₂ loadings between 0.02 to 0.7 moles of CO₂ per mole of amine using humidified N₂ gas as a stripping medium. The experiments for CO absorption were carried out in a 660 mL batch autoclave reactor at 313 to 413 K with amine concentration between 5 to 50-wt% in distilled water. The partial pressure of CO in the reactor was varied from 800 to 1100 kPa. The data for CO₂ absorption and desorption in aqueous amine systems were analyzed using a new, rigorous mathematical model. The model predicts the experimental results well for all amine systems studied. The results indicate that the theory of absorption with reversible chemical reaction could be used to predict desorption rates. The kinetic data obtained show that desorption experiments could be used to determine both forward and backward rate constants accurately. The absorption experiments on the other hand could only be used to determine forward rate constants. The data for CO absorption in aqueous diethanolamine (DEA) solutions were analyzed using the model for mass transfer with extremely slow reactions. The data are consistent with a mechanism by which formyl-diethanolamine (DEAF) is predominantly formed by direct insertion of CO into DEA. The data also confirm that DEAF formation via the DEA-formate reaction is relatively slow and reversible.
Item Metadata
Title |
Absorption and desorption of CO2 and CO in alkanolamine systems
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2002
|
Description |
Absorption and desorption of carbon dioxide (CO₂) and carbon monoxide
(CO) in aqueous alkanolamine solutions are modeled and important kinetic and
physical property data are obtained using novel experimental methods. The
model is based on the principle of diffusional mass transfer accompanied with
fast to very slow chemical reactions in the liquid phase. Fast reactions are
represented by CO₂ absorption/desorption in aqueous alkanolamines and slow
reactions are represented by CO absorption in aqueous diethanolamine (DEA).
The experiments for CO₂ absorption and desorption were conducted in a
novel hemispherical contactor designed and developed in this work. The
absorption experiments were conducted at near atmospheric pressure using pure
CO₂ saturated with water at 293 to 323 K with initially unloaded solutions. The
desorption experiments were performed at 333 to 383 K for CO₂ loadings
between 0.02 to 0.7 moles of CO₂ per mole of amine using humidified N₂ gas as
a stripping medium.
The experiments for CO absorption were carried out in a 660 mL batch
autoclave reactor at 313 to 413 K with amine concentration between 5 to 50-wt%
in distilled water. The partial pressure of CO in the reactor was varied from 800 to
1100 kPa.
The data for CO₂ absorption and desorption in aqueous amine systems
were analyzed using a new, rigorous mathematical model. The model predicts
the experimental results well for all amine systems studied. The results indicate
that the theory of absorption with reversible chemical reaction could be used to
predict desorption rates. The kinetic data obtained show that desorption
experiments could be used to determine both forward and backward rate
constants accurately. The absorption experiments on the other hand could only
be used to determine forward rate constants.
The data for CO absorption in aqueous diethanolamine (DEA) solutions
were analyzed using the model for mass transfer with extremely slow reactions.
The data are consistent with a mechanism by which formyl-diethanolamine
(DEAF) is predominantly formed by direct insertion of CO into DEA. The data
also confirm that DEAF formation via the DEA-formate reaction is relatively slow
and reversible.
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Extent |
12194019 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-09-15
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0058971
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2002-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.