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1
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Pressure swing absorption of carbon dioxide in n-methyl-2-pyrrolidone solutions

100%
Kierzkowska-Pawlak H.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 2
106-109
EN
The mass transfer rates during CO2 absorption and desorption from N-methyl-2-pyrrolidone solutions were measured at 293.15 K in a baffled agitated reactor with a flat gas-liquid interface. Based on the measured values of pressure changes, the desorption rate was determined and compared to the absorption rate at the same driving force. Two distinct mechanisms of desorption were observed. The transition from bubbling to the diffusive desorption is found to be a function of the supersaturation ratio, pressure and the stirring speed.
2
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Determination of Kinetics in Gas-Liquid Reaction Systems. An Overview

100%
Kierzkowska-Pawlak H.
Ecological Chemistry and Engineering S
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2012
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vol. 19
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issue 2
175-196
EN
The aim of this paper is to present a brief review of the determination methods of reaction kinetics in gas-liquid systems with a special emphasis on CO2 absorption in aqueous alkanolamine solutions. Both homogenous and heterogeneous experimental techniques are described with the corresponding theoretical background needed for the interpretation of the results. The case of CO2 reaction in aqueous solutions of methyldiethanolamine is discussed as an illustrative example. It was demonstrated that various measurement techniques and methods of analyzing the experimental data can result in different expressions for the kinetic rate constants.
PL
Celem niniejszej pracy jest przegląd metod określania kinetyki reakcji gaz-ciecz ze szczególnym uwzględnieniem absorpcji CO2 w wodnych roztworach alkanoloamin. Omówiono zarówno homofazowe, jak i heterofazowe techniki eksperymentalne wraz z podstawami teoretycznymi niezbędnymi do interpretacji wyników. Jako przykład zinterpretowano wyniki własnych badań absorpcji CO2 w wodnych roztworach metylodietanoloaminy. Wykazano, że różne techniki pomiarowe i metody analizy danych doświadczalnych mają wpływ na otrzymaną zależność stałej szybkości reakcji od temperatury.
3
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Reaction Kinetics of Carbon Dioxide in Aqueous Diethanolamine Solutions Using the Stopped-Flow Technique

51%
Siemieniec M., Kierzkowska-Pawlak H., Chacuk A.
Ecological Chemistry and Engineering S
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2012
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vol. 19
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issue 1
55-66
EN
The pseudo-first-order rate constants (kOV) for the reactions between CO2 and diethanolamine have been studied using the stopped-flow technique in an aqueous solution at 293, 298, 303 and 313 K. The amine concentrations ranged from 167 to 500 mol·m-3. The overall reaction rate constant was found to increase with amine concentration and temperature. Both the zwitterion and termolecular mechanisms were applied to correlate the experimentally obtained rate constants. The values of SSE quality index showed a good agreement between the experimental data and the corresponding fit by the use of both mechanisms.
PL
W pracy przedstawiono wyniki badań kinetycznych reakcji CO2 w wodnych roztworach dietanoloaminy. Badania przeprowadzono z zastosowaniem techniki zatrzymanego przepływu w temperaturze 293, 298, 303 i 313 K, w zakresie stężeń aminy od 167 do 500 mol·m-3. Stwierdzono wzrost wartości stałej szybkości reakcji pseudopierwszego rzędu wraz ze wzrostem stężenia aminy oraz temperatury. Dane eksperymentalne zostały opisane za pomocą zależności kinetycznych wynikających z mechanizmu jonu dwubiegunowego oraz reakcji trójmolekularnej. Parametry kinetyczne dla obu mechanizmów wyznaczono w oparciu o minimalizację przyjętego wskaźnika jakości (SSE). Wartości tego wskaźnika wykazały dobrą zgodność pomiędzy danymi doświadczalnymi i odpowiednimi dopasowaniami z użyciem obu modeli kinetycznych.
4
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Reaction kinetics of CO2in aqueous methyldiethanolamine solutions using the stopped-flow technique

51%
Kierzkowska-Pawlak H., Siemieniec M., Chacuk A.
Chemical and Process Engineering
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2012
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vol. 33
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issue 1
7-18
EN
The kinetics of the reaction between CO2 and methyldiethanolamine in aqueous solutions have been studied using the stopped-flow technique at 288, 293, 298 and 303 K. The amine concentration ranged from 250 to 875 mol·m-3. The overall reaction rate constant was found to increase with amine concentration and temperature. The acid base catalysis mechanism was applied to correlate the experimentally determined kinetic data. A good agreement between the second order rate constants for the CO2 reaction with MDEA computed from the stopped-flow data and the values reported in the literature was obtained.
5
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A Selection of Amine Sorbents for CO2Capture from Flue Gases

45%
Wilk A., Więcław-Solny L., Śpiewak D., Spietz T., Kierzkowska-Pawlak H.
Chemical and Process Engineering
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2015
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vol. 36
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issue 1
49-57
EN
Amine absorption processes are widely used in the industry to purify refinery gases, process gases or natural gas. Recently, amine absorption has also been considered for CO2 removal from flue gases. It has a number of advantages, but there is one major disadvantage - high energy consumption. This can be reduced by using an appropriate sorbent. From a group of several dozen solutions, three amine sorbents were selected based on primary, tertiary and sterically hindered amines. The solutions were used to test CO2 absorption capacity, absorption kinetics and heat of CO2 absorption. Additional tests were performed on the actual absorber-desorber system to indicate the most appropriate sorbent for capturing CO2 from flue gases.
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