The Effect of Piperazine (PZ) on CO2 Absorption Kinetics into Aqueous Ammonia Solutions at 25.0 °C

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avondale-bepress-to-dspace.facultyScience
avondale-bepress-to-dspace.peer_review_statusPeer reviewed before publication
avondale-bepress.abstract<p>Piperazine (PZ) has been reported as an effective rate promoter in the aqueous ammonia-based solvent process for the post combustion capture (PCC) of CO<sub>2</sub>. However, the detailed promotion effect of PZ on CO<sub>2</sub> absorption into partially loaded ammonia solutions and the mechanism of this process are still unclear. In an effort to determine the detailed promotion effect of PZ in aqueous ammonia-based solvents, overall mass transfer coefficients (<em>K</em><sub>G</sub>) describing the absorption of CO<sub>2</sub> into aqueous PZ/NH<sub>3</sub> solutions were determined using a wetted-wall column apparatus at 25 °C. The effect of added PZ (from 0 to 0.5 M) on the mass transfer of CO<sub>2</sub> into 3.0 M NH<sub>3</sub> solutions over a range of pre-loaded CO<sub>2</sub> concentrations of 0.9 M at 25 °C are reported in this work. The fast kinetic reactions of CO<sub>2</sub>(aq) with blended solutions containing PZ/NH<sub>3</sub> were investigated using stopped-flow spectrophotometry at 25.0 °C. Analysis of the kinetic measurements using a chemical model which incorporates the complete reaction sets of the individual amines with CO<sub>2</sub> (i.e., NH<sub>3</sub>-CO<sub>2</sub>-H<sub>2</sub>O and PZ-CO<sub>2</sub>-H<sub>2</sub>O) resulted in good agreement with the experimental data. The contribution distribution from each reactive species was calculated based on the proposed reaction scheme of the PZ-NH<sub>3</sub>-CO<sub>2</sub>-H<sub>2</sub>O system. Results show that both the PZ/PZH<sup>+</sup> and PZCO2− /PZCO<sub>2</sub>H pathways make contributions to the promotion of CO<sub>2</sub> absorption into PZ promoted aqueous NH<sub>3</sub> solutions. Importantly, the reactive piperazine mono-carbamate species, PZCO2− /PZCO<sub>2</sub>H, which is present in the CO<sub>2</sub>-loaded mixtures of PZ/NH<sub>3</sub>, plays an important role in the promotion of CO<sub>2</sub> absorption into CO<sub>2</sub>-loaded aqueous NH<sub>3</sub> solutions. The mass transfer simulation results reveal that there are additional reactions occurring in the gas–liquid interface and gas phase due to the volatility of NH<sub>3</sub>, which requires further improvement on the simulation model.</p>
avondale-bepress.articleid1097
avondale-bepress.authorsLichun Li
avondale-bepress.authorsWilliam Conway
avondale-bepress.authorsGraeme Puxty
avondale-bepress.authorsRobert Burns
avondale-bepress.authorsSarah Clifford
avondale-bepress.authorsMarcel Maeder
avondale-bepress.authorsHai Yu
avondale-bepress.context-key12530355
avondale-bepress.coverpage-urlhttps://research.avondale.edu.au/sci_math_papers/96
avondale-bepress.document-typearticle
avondale-bepress.field.author_faculty_disciplineScience
avondale-bepress.field.avon_earlyonline2015-03-13T00:00:00-07:00
avondale-bepress.field.comments<p>Due to copyright restrictions this article is unavailable for download.</p> <p>Staff and Students of Avondale College may access the full text of this article via a Library PRIMO search <a href="https://avondale-primo.hosted.exlibrisgroup.com/primo-explore/search?vid=AVN&lang=en_US">here</a>.</p>
avondale-bepress.field.custom_citation<p>Li, L., Conway, W., Puxty, G., Burns, R., Clifford, S., Maeder, M., & Yu, H. (2015). The effect of piperazine (PZ) on CO2 absorption kinetics into aqueous ammonia solutions at 25.0 °C. <em>International Journal of Greenhouse Gas Control,</em> <em>36</em>, 135-143. doi:10.1016/j.ijggc.2015.02.015</p>
avondale-bepress.field.doihttps://doi.org/10.1016/j.ijggc.2015.02.015
avondale-bepress.field.embargo_date2018-07-23T00:00:00Z
avondale-bepress.field.field_of_education01 Natural and Physical Sciences
avondale-bepress.field.for03 CHEMICAL SCIENCES
avondale-bepress.field.issn1750-5836
avondale-bepress.field.journalInternational Journal of Greenhouse Gas Control
avondale-bepress.field.page_numbers135-143
avondale-bepress.field.peer_reviewBefore publication
avondale-bepress.field.publication_date2015-05-01T00:00:00Z
avondale-bepress.field.source_fulltext_urlhttps://doi.org/10.1016/j.ijggc.2015.02.015
avondale-bepress.field.source_publication<p>This article was originally published as:</p> <p>Li, L., Conway, W., Puxty, G., Burns, R., Clifford, S., Maeder, M., & Yu, H. (2015). The effect of piperazine (PZ) on CO2 absorption kinetics into aqueous ammonia solutions at 25.0 °C. <em>International Journal of Greenhouse Gas Control, 36, </em>135-143. doi:10.1016/j.ijggc.2015.02.015</p> <p>ISSN: 1750-5836<em><br /> <br /> </em></p>
avondale-bepress.field.staff_classificationContract
avondale-bepress.field.volume_number36
avondale-bepress.keywordsCO2 capture; Aqueous ammonia solutions; Piperazine; Promotion mechanism
avondale-bepress.label96
avondale-bepress.publication-date2015-05-01T00:00:00Z
avondale-bepress.publication-titleScience and Mathematics Papers and Journal Articles
avondale-bepress.statepublished
avondale-bepress.submission-date2018-07-23T21:11:27Z
avondale-bepress.submission-pathsci_math_papers/96
avondale-bepress.titleThe Effect of Piperazine (PZ) on CO2 Absorption Kinetics into Aqueous Ammonia Solutions at 25.0 °C
avondale-bepress.typearticle
dc.contributor.authorYu, Hai
dc.contributor.authorMaeder, Marcel
dc.contributor.authorClifford, Sarah
dc.contributor.authorBurns, Robert
dc.contributor.authorPuxty, Graeme
dc.contributor.authorConway, William
dc.contributor.authorLi, Lichun
dc.date.accessioned2023-11-01T00:27:04Z
dc.date.available2023-11-01T00:27:04Z
dc.date.issued2015-05-01
dc.date.submitted2018-07-23T21:11:27Z
dc.description.abstract<p>Piperazine (PZ) has been reported as an effective rate promoter in the aqueous ammonia-based solvent process for the post combustion capture (PCC) of CO<sub>2</sub>. However, the detailed promotion effect of PZ on CO<sub>2</sub> absorption into partially loaded ammonia solutions and the mechanism of this process are still unclear. In an effort to determine the detailed promotion effect of PZ in aqueous ammonia-based solvents, overall mass transfer coefficients (<em>K</em><sub>G</sub>) describing the absorption of CO<sub>2</sub> into aqueous PZ/NH<sub>3</sub> solutions were determined using a wetted-wall column apparatus at 25 °C. The effect of added PZ (from 0 to 0.5 M) on the mass transfer of CO<sub>2</sub> into 3.0 M NH<sub>3</sub> solutions over a range of pre-loaded CO<sub>2</sub> concentrations of 0.9 M at 25 °C are reported in this work. The fast kinetic reactions of CO<sub>2</sub>(aq) with blended solutions containing PZ/NH<sub>3</sub> were investigated using stopped-flow spectrophotometry at 25.0 °C. Analysis of the kinetic measurements using a chemical model which incorporates the complete reaction sets of the individual amines with CO<sub>2</sub> (i.e., NH<sub>3</sub>-CO<sub>2</sub>-H<sub>2</sub>O and PZ-CO<sub>2</sub>-H<sub>2</sub>O) resulted in good agreement with the experimental data. The contribution distribution from each reactive species was calculated based on the proposed reaction scheme of the PZ-NH<sub>3</sub>-CO<sub>2</sub>-H<sub>2</sub>O system. Results show that both the PZ/PZH<sup>+</sup> and PZCO2− /PZCO<sub>2</sub>H pathways make contributions to the promotion of CO<sub>2</sub> absorption into PZ promoted aqueous NH<sub>3</sub> solutions. Importantly, the reactive piperazine mono-carbamate species, PZCO2− /PZCO<sub>2</sub>H, which is present in the CO<sub>2</sub>-loaded mixtures of PZ/NH<sub>3</sub>, plays an important role in the promotion of CO<sub>2</sub> absorption into CO<sub>2</sub>-loaded aqueous NH<sub>3</sub> solutions. The mass transfer simulation results reveal that there are additional reactions occurring in the gas–liquid interface and gas phase due to the volatility of NH<sub>3</sub>, which requires further improvement on the simulation model.</p>
dc.description.versionBefore publication
dc.identifier.citation<p>Li, L., Conway, W., Puxty, G., Burns, R., Clifford, S., Maeder, M., & Yu, H. (2015). The effect of piperazine (PZ) on CO2 absorption kinetics into aqueous ammonia solutions at 25.0 °C. <em>International Journal of Greenhouse Gas Control,</em> <em>36</em>, 135-143. doi:10.1016/j.ijggc.2015.02.015</p>
dc.identifier.doihttps://doi.org/10.1016/j.ijggc.2015.02.015
dc.identifier.issn1750-5836
dc.identifier.urihttps://research.avondale.edu.au/handle/123456789/12530355
dc.language.isoen_us
dc.provenance<p>This article was originally published as:</p> <p>Li, L., Conway, W., Puxty, G., Burns, R., Clifford, S., Maeder, M., & Yu, H. (2015). The effect of piperazine (PZ) on CO2 absorption kinetics into aqueous ammonia solutions at 25.0 °C. <em>International Journal of Greenhouse Gas Control, 36, </em>135-143. doi:10.1016/j.ijggc.2015.02.015</p> <p>ISSN: 1750-5836<em><br /> <br /> </em></p>
dc.subjectCO2 capture; Aqueous ammonia solutions; Piperazine; Promotion mechanism
dc.titleThe Effect of Piperazine (PZ) on CO2 Absorption Kinetics into Aqueous Ammonia Solutions at 25.0 °C
dc.typeJournal Article
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