Comparison of the rate of CO2 absorption into aqueous ammonia and monoethanolamine

Puxty, Graeme; Rowland, Robert; Attalla, Moetaz I.

doi:10.1016/j.ces.2009.09.042

Cited by 211 publications

(165 citation statements)

References 15 publications

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“…In addition, the results find that the RA increases with the pH and gas input concentrations, as shown in Figure 6b,c. Alternatively, a wetted-wall column for CO2 absorption test is reported in literatures by different scholars, who obtain RA in the range of 2.15 × 10 −4 -4.48 × 10 −3 mol/(L·s) [13] and 2.05 × 10 −4 -5.53 × 10 −3 mol/(L·s) [26], respectively. Some of these values are higher than that reported in here, 3.21 × 10 −4 -1.10 × 10 −3 mol/(L·s).…”

Section: Effect Of Process Variables On the Ra And Kgamentioning

confidence: 99%

CO2 Capture and Crystallization of Ammonia Bicarbonate in a Lab-Scale Scrubber

Chen

2018

Crystals

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A lab-scale bubble-column scrubber is used to capture CO 2 gas and produce ammonia bicarbonate (ABC) using aqueous ammonia as an absorbent under a constant pH and temperature. The CO 2 concentration is adjusted by mixing N 2 and CO 2 in the range of 15-60 vol % at 55 • C. The process variables are the pH of the solution, temperature, gas-flow rate and the concentration of gas. The effects of the process variables on the removal efficiency (E), absorption rate (R A ) and overall mass-transfer coefficient (K G a) were explored. A multiple-tube mass balance model was used to determine R A and K G a, in which R A and K G a were in the range of 2.14 × 10 −4 -1.09 × 10 −3 mol/(s·L) and 0.0136-0.5669 1/s, respectively. Results found that, R A showed an obvious increase with the increase in pH, inlet gas concentration and gas temperature, while K G a decreased with an increase in inlet gas concentration. Using linear regression, an empirical expression for K G a/E was obtained. On the other hand, ammonia bicarbonate crystals could be produced at a pH of 9.5 when the gas concentration was higher than 30% and γ (=F g /F A , the gas-liquid molar flow rate ratio) ≥ 1.5.

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Section: Effect Of Process Variables On the Ra And Kgamentioning

confidence: 99%

CO2 Capture and Crystallization of Ammonia Bicarbonate in a Lab-Scale Scrubber

Chen

2018

Crystals

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“…For example, a kinetics of absorption by a 30 wt% monoethanolamine solution will be studied on a wettedwall column (Puxty et al, 2010), whereas a 50 wt%. methyldiethanolamine will be studied on a stirred vessel (Versteeg and van Swaaij, 1988b).…”

Section: Mass-transfer Techniquesmentioning

confidence: 99%

Kinetics of Carbon Dioxide with Amines. I. Stopped-Flow Studies in Aqueous Solutions. A Review

Couchaux

Barth

Jacquin

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Cine´tique du dioxyde de carbone avec les amines -I. É tude par stopped-flow en solution aqueuse. Une revue -Il est possible de trouver de nombreuses informations sur la cine´tique de re´action amine-CO 2 dans la litte´rature. Toutefois, comme il existe plusieurs techniques expe´rimentales et plusieurs me´canismes re´actionnels possibles, on observe parfois une grande dispersion des re´sultats expe´rimentaux avec diverses interpre´tations. Dans cet article, une me´thode qui permet de comparer les constantes cine´tiques obtenues par diffe´rents auteurs est propose´e. D'abord nous pre´sentons les diffe´rentes techniques expe´rimentales et justifions de comparer les donne´es obtenues par la technique d'e´coulement a`flux bloque´. Ensuite nous repre´sentons les donne´es cine´tiques des diffe´rentes amines e´tudie´es dans la litte´rature a`partir d'une de´pendance en loi puissance en fonction de la concentration. Cette repre´sentation illustre certaines relations structure-proprie´te´et permet de confronter les donne´es expe´rimentales aux diffe´rents me´canismes propose´s. Les avantages et limites de chaque me´canisme sont discute´s. Finalement nous justifions l'utilisation d'un mode`le termole´culaire pour comparer les donne´es obtenues par diffe´rents auteurs. Ce mode`le conduit a`l'observation d'un phe´nome`ne de compensation qui est un argument en faveur du me´canisme correspondant.Abstract -Kinetics of Carbon Dioxide with Amines. I. Stopped-Flow Studies in Aqueous Solutions. A Review -It is possible to find plenty of information about kinetics of reaction between amine and carbone dioxide in the literature. However, there are several experimental techniques and several possible mechanisms which lead to observe sometimes high dispersion of experimental results with various interpretations. A method which enables to compare kinetic constant got by different authors is proposed in this work. First, we present experimental techniques and justify comparison of data obtained by stopped-flow technique. Then, we plot kinetic data for all amines studied in the literature by a power law dependency with the concentration. This representation illustrates some structureactivity relationships and enables to confront experimental results with the different mechanisms. Advantages and limits of each mechanism are discussed. Finally, we justify the choice of the termolecular model to compare data got by different authors. This model leads to a compensation effect which is an argument in favour of this mechanism.

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“…Monoethanolamine (MEA) is the solvent most often used as a reference in comparative studies to develop more energy efficient absorbents for post-combustion CO2 capture (Liang et al, 2015(Liang et al, , 2016Luo et al, 2009;Puxty et al, 2010;Wang et al, 2011). In general, the process is costly and relatively energy intensive and work is ongoing around the world to make it economically and energetically more attractive for industrial implementation.…”

Section: Introductionmentioning

confidence: 99%