Rate of absorption of carbon dioxide in a mixed solvent

Xu, Shuo; Wang, Yi Wei; Otto, Frederick D.; Mather, Alan E.

doi:10.1021/ie00054a022

Cited by 22 publications

(17 citation statements)

References 8 publications

(15 reference statements)

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“…A pressure decrease method similar to that presented by and further developed by Blauwhoff et al (1984) was applied to measure the kinetic constants of physical or chemical absorption of gases in the aqueous 2-PE solutions. More detailed information about the experiments was presented by Xu et al (1991). The reaction conditions of the experiments were selected in such a way that the absorption process occurred in the "fast pseudo-first-order reaction regime" (3 << Ha<< E i ) .…”

Section: Experiments and Methodsmentioning

confidence: 99%

Kinetics of the reaction of carbon dioxide with aqueous 2‐piperidineethanol solutions

Wang

Otto

et al. 1993

AIChE Journal

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Sterically hindered amines have been proposed recently as attractive solvents for acid gas purification, since they have not only greater capacity for C 0 2 but also a low tendency to form carbamate and an appreciable absorption rate for C 0 2 (Sharma, 1965;Sartori and Savage, 1983;Savage et al., 1984;Say et al., 1984). The advantages of sterically hindered amines result from the bulkiness of the substituent attached to the amino group which causes an increased cyclic capacity and a decreased energy consumption in industrial operations. 2-piperidineethanol(2-PE) is a secondary amine in which the amino group is not only attached to a naphthenic ring group but also sterically hindered by a hydroxyethyl group that is connected to the Q carbon atom of the cyclic system. It has been used for the bulk removal of C 0 2 or the selective removal of H2S (Goldstein et al., 1986).Little information on 2-PE is available. Shen et al. (1991) investigated the kinetic rate of C 0 2 in aqueous 2-PE solutions at 40°C within the amine concentration range 0.2-1.0 kmol/ m3. Their results showed that the reaction of C 0 2 in aqueous 2-PE solutions is first-order with respect to both C 0 2 and the amine. The second-order forward rate constant at 40°C was found to be 195 m'/(kmol-s), which is much lower than that of 2-amino-2-methyl-1-propanol (AMP). Xu et al. (1992) presented the physicochemical properties of 2-PE and its aqueous solutions over a wide range of temperature and concentration. They found that the value of pKa for 2-PE at 25°C is 10.14, which is higher than that of AMP (the pKa of AMP is 9.694).The aim of this work is to investigate the kinetic rate of absorption of C02 in aqueous 2-PE solutions using a stirredcell absorber. The reaction mechanism and the kinetic order with respect to both the reactants C 0 2 and 2-PE are studied within the amine concentration range of 0.25-2.5 kmol/m3, over the temperature range from 10-40°C. Reaction MechanismThe main reaction is to form the carbamate even though there are several parallel and series reversible reactions simultaneously occurring in the solution. This reaction can be described by the zwitterion mechanism:Correspondence concerning this work should be addressed to A.

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Section: Experiments and Methodsmentioning

confidence: 99%

Kinetics of the reaction of carbon dioxide with aqueous 2‐piperidineethanol solutions

Wang

Otto

et al. 1993

AIChE Journal

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“…Kohl and Riesenfeld 1985 and Hendriks et The MEA scrubbing is widely used in the chemical engineering process of gas purification. However, current practices of applying MEA solvent to remove CO from flue gas have found 2 Ž their limitations Xu et al, 1991;Molburg et al, . Ž .…”

Section: Introductionmentioning

confidence: 99%

Comparison of ammonia and monoethanolamine solvents to reduce CO2 greenhouse gas emissions

Yeh

Bai

1999

Science of The Total Environment

265

146

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Ž. This paper presents experimental results on the evaluation of two reagents, ammonia NH and monoethanolamine 3 Ž . Ž . MEA solvents, for scrubbing carbon dioxide CO greenhouse gas emissions. The scrubbing of CO by NH 3 scrubbing process. This indicates that the energy requirement for the regeneration of NH reagent should be less 3 than that for the regeneration of MEA reagent. ᮊ which significantly contribute to global warming, and that the global warming caused by increasing emissions of these gases is one of the most serious environmental problems. Among these gases, CO has the greatest adverse impact on the 2 observed greenhouse effect causing approximately 55% of the observed global warming Ž . IPCC, 1990 . Hence, the reduction of CO emis-2 sions from the fossil fuel energy systems is considered to be the most urgent to slow down the global warming trend. 0048-9697r99r$ -see front matter ᮊ 1999 Elsevier Science B.V. All rights reserved. Ž . PII: S 0 0 4 8 -9 6 9 7 9 9 0 0 0 2 5 -X ( ) A.C. Yeh, H. Bai r The Science of the Total En¨ironment 228 1999 121᎐133 122

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“…Values of k 0 for reaction between CO 2 and aqueous (MDEA + PZ at 10 mol/m 3 ) solutions at different concentrations and temperatures description of the interaction of CO 2 and MDEA in this case as the main reaction between CO 2 with water and OH À as subordinate reaction, beside sulfolane contribution. According to Xu et al, [11] in aqueous amine solutions, sulfolane apparent kinetic rate with CO 2 is so small compared to that of AMP that it can be neglected, but participates like water in the deprotonation of the zwitterion.…”

Section: Aqueous Mdea + Sulfolane Systemmentioning

confidence: 99%

“…The capacity of sulfolane for acid gases is nearly eight times that of water at all partial pressures. [11] One of the benefits of using an aqueous sulfolaneamine process for acid gas capture is its ability to concurrently remove mercaptans and carbonyl sulphides which are not removed by chemical solvents. [12] Dunn et al [13] described an essential industrial mixed solvent called Sulfinol which consists of DIPA, sulfolane, and water.…”

Section: Introductionmentioning

confidence: 99%

“…Equilibrium data for CO 2 in an (AMP + sulfolane + H 2 O) system at 40 and 100 C and at partial pressures up to 6000 kPa were published by Roberts and Mather. [14] The kinetics of absorption of CO 2 in a mixed solvent composed of (sulfolane + AMP + H 2 O) using a stirred-cell absorber were studied by Xu et al [11] Macgregor and Mather [15] reported the solubility of H 2 S, CO 2 , and their mixtures at 313 and 373 K in a blended-solvent composed of MDEA ($21 wt.%) and sulfolane ($30 wt.%). However, there has been no published study reporting on the kinetic data for mixed solvents, especially aqueous systems of (MDEA + sulfolane) or (PZ + sulfolane), widely used in natural gas sweetening plants.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of kinetic rates of CO₂ in aqueous solutions of piperazine and methyldiethanolamine with addition of sulfolane

et al. 2021

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Measurements of kinetics rates of CO 2 in aqueous solutions of methyldiethanolamine (MDEA), piperazine (PZ), and mixtures of (MDEA + PZ), (PZ + sulfolane) and (MDEA + sulfolane) were carried out using the stopped flow technique, and reported in terms of pseudo-first-order rate constants (k 0 ). When possible, the second-order reaction rate constants (k 2 ) were regressed from the data. Experiments were performed over new concentration ranges of (10-60), (200-800), (200-800, 10-40), (10-40, 10-200), and (200-800, 10-200) mol/m 3 for the above-mentioned five systems, respectively, and at temperatures varying from (298.15-313.15 K). When sulfolane was added to the amine solution, pseudo-firstorder rate constants in the mixed solvents were higher than in aqueous MDEA and PZ solutions at all temperatures. The kinetic rates were highest at 298.15 K and decreased at higher temperatures for aqueous (MDEA + sulfolane) solutions but increased with temperature for aqueous (PZ + sulfolane) systems. Reaction orders for both PZ and MDEA were practically one at all sulfolane concentrations and temperatures. The base catalysis mechanism was used to regress very well data for aqueous MDEA and (MDEA + sulfolane + water) and the termolecular mechanism was used for (PZ + sulfolane + water) system. Both the zwitterion and termolecular models were able to fit the experimental data for the aqueous PZ system well. Finally, the termolecular and a hybrid model based on the combination of the Zwitterion and base catalysis mechanisms were able to successfully correlate the experimental data for the mixed aqueous (MDEA + PZ) systems.

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Rate of absorption of carbon dioxide in a mixed solvent

Cited by 22 publications

References 8 publications

Kinetics of the reaction of carbon dioxide with aqueous 2‐piperidineethanol solutions

Kinetics of the reaction of carbon dioxide with aqueous 2‐piperidineethanol solutions

Comparison of ammonia and monoethanolamine solvents to reduce CO2 greenhouse gas emissions

Enhancement of kinetic rates of CO₂ in aqueous solutions of piperazine and methyldiethanolamine with addition of sulfolane

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Rate of absorption of carbon dioxide in a mixed solvent

Cited by 22 publications

References 8 publications

Kinetics of the reaction of carbon dioxide with aqueous 2‐piperidineethanol solutions

Kinetics of the reaction of carbon dioxide with aqueous 2‐piperidineethanol solutions

Comparison of ammonia and monoethanolamine solvents to reduce CO2 greenhouse gas emissions

Enhancement of kinetic rates of CO2 in aqueous solutions of piperazine and methyldiethanolamine with addition of sulfolane

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Enhancement of kinetic rates of CO₂ in aqueous solutions of piperazine and methyldiethanolamine with addition of sulfolane