Speciation of MEA-CO2 Adducts at Equilibrium Using Raman Spectroscopy

Idris, Zulkifli; Jens, Klaus; Eimer, Dag-Arne

doi:10.1016/j.egypro.2014.11.152

Cited by 20 publications

(24 citation statements)

References 10 publications

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“…Py  f a (20) where  is the vapour phase fugacity coefficient, which can be calculated using the Redlich-Kwong equations, 34 a is the water activity, which can be calculated by the Pitzer equation 30 and f is the fugacity of the liquid water, which can be calculated as follows: 35 ln f T ln T T (21) Table 3. Parameters for the Henry's constant in MPa kg/mol:…”

Section: Vapor-liquid Equilibrium (Vle)mentioning

confidence: 99%

Predicting Speciation of Ammonia, Monoethanolamine, and Diethanolamine Using Only Ionic Radius and Ionic Charge

Simoes

Hughes

Ingham

et al. 2018

Ind. Eng. Chem. Res.

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This study investigates the speciation of CO2 involving the most common solvents used to capture carbon from the flue gas, i.e. ammonia, MEA and DEA. This requires the knowledge of both the activity coefficients of the species involved and the equilibrium constants of the relevant reactions. In contrast to the equilibrium constants, which can be obtained from the literature, the activity coefficients of the aqueous species are required to be estimated. Normally, semi-empirical models are used to estimate these activity coefficients, i.e. equations that contain unknown parameters that are obtained through regression against experimental data. In contrast, in this study the activity coefficients are predicted using equations that require only the knowledge of the ionic radii and charges of the species involved in the equilibrium. As a conclusion, the model developed shows a very good agreement with the experimental data obtained, either from spectroscopy or from Vapor Liquid Equilibrium (VLE), up to a solvent mass fraction of 20%.

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Section: Vapor-liquid Equilibrium (Vle)mentioning

confidence: 99%

Predicting Speciation of Ammonia, Monoethanolamine, and Diethanolamine Using Only Ionic Radius and Ionic Charge

Simoes

Hughes

Ingham

et al. 2018

Ind. Eng. Chem. Res.

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“…Due to the long term use and proven reliability, and familiarity with wet chemical methods, offline analysis are still used such as barium chloride (BaCl2) titration-precipitation method (Idris et al, 2014;Weiland et al, 1969) and analysis via acidic evolution (Hilliard, 2008) and LC-MS (Knudsen et al, 2014) for determining CO2 loadings.…”

Section: Introductionmentioning

confidence: 99%

Application of Raman spectroscopy to real-time monitoring of CO2 capture at PACT pilot plant; Part 1: Plant operational data

Akram

Jinadasa

Tait

et al. 2020

International Journal of Greenhouse Gas Control

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Process analyzers for in-situ monitoring give advantages over the traditional analytical methods such as their fast response, multi-chemical information from a single measurement unit, minimal errors in sample handing and ability to use for process control. This study discusses the suitability of Raman spectroscopy as a process analytical tool for in-situ monitoring of CO2 capture using aqueous monoethanolamine (MEA) solution by presenting its performance during a 3-day test campaign at PACT pilot plant in Sheffield, UK. Two Raman immersion probes were installed on lean and rich streams for real time measurements. A multivariate regression model was used to determine the CO2 loading. The plant performance is described in detail by comparing the CO2 loading in each solvent stream at different process conditions. The study shows that the predicted CO2 loading recorded an acceptable agreement with the offline measurements. The findings from this study suggest that Raman Spectroscopy has the capability to follow changes in process variables and can be employed for real time monitoring and control of the CO2 capture process. In addition, these predictions can be used to optimize process parameters; to generate data to use as inputs for thermodynamic models, plant design and scale-up scenarios.

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“…Sterically Hindered Amine (SHA) is a term coined by Sartori and Savage in 1983 to define any primary or secondary amine derivatives in which the amino group is bonded to a tertiary carbon atom and a secondary or tertiary carbon atom, respectively [1]. They have long been known for their performance in carbon dioxide removal for gas steaming in industrial chemical processes [2][3][4]. (2,2,6,6)-Tetramethylpiperidin-4-ol derivatives 1 belong to this compound class and have added an extra-dimension to applications over the last two decades.…”

Section: Introductionmentioning

confidence: 99%

“…They have long been known for their performance in carbon dioxide removal for gas steaming in industrial chemical processes [2][3][4]. (2,2,6,6)-Tetramethylpiperidin-4-ol derivatives 1 belong to this compound class and have added an extra-dimension to applications over the last two decades. Indeed, 1 is a synthetic precursor of TEMPOL [5] which is a well-known nitroxyl radical of major interest in organic synthesis [6], as well as polymer chemistry [7].…”

Section: Introductionmentioning

confidence: 99%

General methodology for the chemoselective N-alkylation of (2,2,6,6)-tetramethylpiperidin-4-ol: Contribution of microwave irradiation

Membrat

Vasseur

Giordano

et al. 2019

Tetrahedron Letters

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A convenient method to access a broad variety of N-alkyl-(2,2,6,6)-tetramethylpiperidin-4-ol compounds is reported. The thermal treatment of a mixture of (2,2,6,6)-tetramethylpiperidin-4-ol and allyl or benzyl bromide derivatives gave the corresponding N-alkylated compounds in good yields while leaving the hydroxyl functional group intact. Whereas 40 h were needed to reach complete conversion, microwave irradiation allowed the reaction time to be reduced (20 min) and improved the yields in most cases.

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Speciation of MEA-CO2 Adducts at Equilibrium Using Raman Spectroscopy

Cited by 20 publications

References 10 publications

Predicting Speciation of Ammonia, Monoethanolamine, and Diethanolamine Using Only Ionic Radius and Ionic Charge

Predicting Speciation of Ammonia, Monoethanolamine, and Diethanolamine Using Only Ionic Radius and Ionic Charge

Application of Raman spectroscopy to real-time monitoring of CO2 capture at PACT pilot plant; Part 1: Plant operational data

General methodology for the chemoselective N-alkylation of (2,2,6,6)-tetramethylpiperidin-4-ol: Contribution of microwave irradiation

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