Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine

This work includes wetted wall column experiments that measure the CO₂ equilibrium partial pressure and liquid film mass transfer coefficient (kg') in 7, 9, 11, and 13 m MEA and 2, 5, 8, and 12 m PZ solutions. A 7 m MEA/2 m PZ blend was also examined. Absorption and desorption experiments were...

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Main Author: Dugas, Ross Edward
Format: Others
Language:English
Published: 2010
Subjects:
Online Access:http://hdl.handle.net/2152/7586
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spelling ndltd-UTEXAS-oai-repositories.lib.utexas.edu-2152-75862015-09-20T16:53:47ZCarbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamineDugas, Ross EdwardCarbon dioxideAbsorptionDesorptionDiffusionAqueous piperazineMonoethanolamineWetted wall columnAspen Plus® RateSep™RateSep™AminesThis work includes wetted wall column experiments that measure the CO₂ equilibrium partial pressure and liquid film mass transfer coefficient (kg') in 7, 9, 11, and 13 m MEA and 2, 5, 8, and 12 m PZ solutions. A 7 m MEA/2 m PZ blend was also examined. Absorption and desorption experiments were performed at 40, 60, 80, and 100°C over a range of CO₂ loading. Diaphragm diffusion cell experiments were performed with CO₂ loaded MEA and PZ solutions to characterize diffusion behavior. All experimental results have been compared to available literature data and match well. MEA and PZ spreadsheet models were created to explain observed rate behavior using the wetted wall column rate data and available literature data. The resulting liquid film mass transfer coefficient expressions use termolecular (base catalysis) kinetics and activity-based rate expressions. The kg' expressions accurately represent rate behavior over the very wide range of experimental conditions. The models fully explain rate effects with changes in amine concentration, temperature, and CO₂ loading. These models allow for rate behavior to be predicted at any set of conditions as long as the parameters in the kg' expressions can be accurately estimated. An Aspen Plus® RateSep™ model for MEA was created to model CO₂ flux in the wetted wall column. The model accurately calculated CO₂ flux over the wide range of experimental conditions but included a systematic error with MEA concentration. The systematic error resulted from an inability to represent the activity coefficient of MEA properly. Due to this limitation, the RateSep™ model will be most accurate when finetuned to one specific amine concentration. This Aspen Plus® RateSep™ model allows for scale up to industrial conditions to examine absorber or stripper performance.text2010-06-02T18:30:27Z2010-06-02T18:30:27Z2009-122010-06-02T18:30:27Zelectronichttp://hdl.handle.net/2152/7586engCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.
collection NDLTD
language English
format Others
sources NDLTD
topic Carbon dioxide
Absorption
Desorption
Diffusion
Aqueous piperazine
Monoethanolamine
Wetted wall column
Aspen Plus® RateSep™
RateSep™
Amines
spellingShingle Carbon dioxide
Absorption
Desorption
Diffusion
Aqueous piperazine
Monoethanolamine
Wetted wall column
Aspen Plus® RateSep™
RateSep™
Amines
Dugas, Ross Edward
Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
description This work includes wetted wall column experiments that measure the CO₂ equilibrium partial pressure and liquid film mass transfer coefficient (kg') in 7, 9, 11, and 13 m MEA and 2, 5, 8, and 12 m PZ solutions. A 7 m MEA/2 m PZ blend was also examined. Absorption and desorption experiments were performed at 40, 60, 80, and 100°C over a range of CO₂ loading. Diaphragm diffusion cell experiments were performed with CO₂ loaded MEA and PZ solutions to characterize diffusion behavior. All experimental results have been compared to available literature data and match well. MEA and PZ spreadsheet models were created to explain observed rate behavior using the wetted wall column rate data and available literature data. The resulting liquid film mass transfer coefficient expressions use termolecular (base catalysis) kinetics and activity-based rate expressions. The kg' expressions accurately represent rate behavior over the very wide range of experimental conditions. The models fully explain rate effects with changes in amine concentration, temperature, and CO₂ loading. These models allow for rate behavior to be predicted at any set of conditions as long as the parameters in the kg' expressions can be accurately estimated. An Aspen Plus® RateSep™ model for MEA was created to model CO₂ flux in the wetted wall column. The model accurately calculated CO₂ flux over the wide range of experimental conditions but included a systematic error with MEA concentration. The systematic error resulted from an inability to represent the activity coefficient of MEA properly. Due to this limitation, the RateSep™ model will be most accurate when finetuned to one specific amine concentration. This Aspen Plus® RateSep™ model allows for scale up to industrial conditions to examine absorber or stripper performance. === text
author Dugas, Ross Edward
author_facet Dugas, Ross Edward
author_sort Dugas, Ross Edward
title Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
title_short Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
title_full Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
title_fullStr Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
title_full_unstemmed Carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
title_sort carbon dioxide absorption, desorption, and diffusion in aqueous piperazine and monoethanolamine
publishDate 2010
url http://hdl.handle.net/2152/7586
work_keys_str_mv AT dugasrossedward carbondioxideabsorptiondesorptionanddiffusioninaqueouspiperazineandmonoethanolamine
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