Performance simulations of MEA/NH3 based large-scale CO2 capture in packed columns under different flue gas parameters

Zhang, Minkai; Guo, Yu

doi:10.1007/s11814-014-0369-8

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…This evidence of carbonate formation under SFC conditions is consistent with nonchromatographic applications concerning the removal of carbon dioxide with aqueous ammonia. − In chromatography, these practices have gained traction as a “trick” to enhance separation speed and selectivity of polar basic analytes or, simply, to streamline the drying process after SFC purifications without a clear understanding of the underlying phenomenon. , The IC-CD experiments in the present work unambiguously prove the hypothesis that an in situ formation of a carbonate species occurred under SFC conditions. ,, …”

Section: Resultssupporting

confidence: 83%

Chaotropic Effects in Sub/Supercritical Fluid Chromatography via Ammonium Hydroxide in Water-Rich Modifiers: Enabling Separation of Peptides and Highly Polar Pharmaceuticals at the Preparative Scale

et al. 2019

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Chromatographic separation, analysis and characterization of complex highly polar analyte mixtures can often be very challenging using conventional separation approaches. Analysis and purification of hydrophilic compounds have been dominated by liquid chromatography (LC) and ion-exchange chromatography (IC), with sub/supercritical fluid chromatography (SFC) moving toward these new applications beyond traditional chiral separations. However, the low polarity of supercritical carbon dioxide (CO2) has limited the use of SFC for separation and purification in the bioanalytical space, especially at the preparative scale. Reaction mixtures of highly polar species are strongly retained even using polar additives in alcohol modifier/CO2 based eluents. Herein, we overcome these problems by introducing chaotropic effects in SFC separations using a nontraditional mobile phase mixture consisting of ammonium hydroxide combined with high water concentration in the alcohol modifier and carbon dioxide. The separation mechanism was here elucidated based on extensive IC-CD (IC couple to conductivity detection) analysis of cyclic peptides subjected to the SFC conditions, indicating the in situ formation of a bicarbonate counterion (HCO3 –). In contrast to other salts, HCO3 – was found to play a crucial role acting as a chaotropic agent that disrupts undesired H-bonding interactions, which was demonstrated by size-exclusion chromatography coupled with differential hydrogen–deuterium exchange-mass spectrometry experiments (SEC-HDX-MS). In addition, the use of NH4OH in water-rich MeOH modifiers was compared to other commonly used basic additives (diethylamine, triethylamine, and isobutylamine) showing unmatched chromatographic and MS detection performance in terms of peak shape, retention, selectivity, and ionization as well as a completely different selectivity and retention behavior. Moreover, relative to ammonium formate and ammonium acetate in water-rich methanol modifier, the ammonium hydroxide in water additive showed better chromatographic performance with enhanced sensitivity. Further optimization of NH4OH and H2O levels in conjunction with MeOH/CO2 served to furnish a generic modifier (0.2% NH4OH, 5% H2O in MeOH) that enables the widespread transition of SFC to domains that were previously considered out of its scope. This approach is extensively applied to the separation, analysis, and purification of multicomponent reaction mixtures of closely related polar pharmaceuticals using readily available SFC instrumentation. The examples described here cover a broad spectrum of bioanalytical and pharmaceutical applications including analytical and preparative chromatography of organohalogenated species, nucleobases, nucleosides, nucleotides, sulfonamides, and cyclic peptides among other highly polar species.

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Section: Resultssupporting

confidence: 83%

Chaotropic Effects in Sub/Supercritical Fluid Chromatography via Ammonium Hydroxide in Water-Rich Modifiers: Enabling Separation of Peptides and Highly Polar Pharmaceuticals at the Preparative Scale

et al. 2019

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“…However, in practical industrial applications, the packed column is the most widely used separation equipment because of large production capacity, high separation efficiency, small pressure drops, and small liquid holdup. 7 The vapor-liquid mass transfer behavior in packed column is different from that in the bubbling reactor and the wetted-wall column, 32 which may affect the enhancement effect of nanoparticles on CO 2 absorption process. Even though CO 2 mass transfer rate into various nanofluids has been numerically predicted by Zerai et al 33 experimental study of nanoparticles' impact on the CO 2 absorption process in a packed tower was rarely reported, to the best of our knowledge.…”

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confidence: 99%

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

et al. 2022

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In this study, the mass transfer enhancement by nanoparticles during CO 2 absorption process with MDEA solution in a randomly packed tower was investigated. The mass transfer performance of MDEA solution with and without nanoparticles were quantified and analyzed in terms of the volumetric overall mass transfer coefficient (K G a v ). An enhancement factor (E), defined as the ratio of K G a v with and without nanoparticles, was further introduced to evaluate the enhancement effect of the addition of nanoparticles. The effects of TiO 2 nanoparticle concentration, MDEA concentration, liquid flow rate, liquid temperature, inert gas flow rate, and CO 2 loading on K G a v and E were systematically studied in the packed tower. It is found that the maximum value of E can reach 1.37, when the nanoparticle concentration is 0.09 wt %, the liquid flow rate is 21.22 m 3 /m 2 •h, the liquid temperature is 27°C, the MDEA concentration is 30%, the gas flow rate is 7.58 kmol/m 2 •h and the CO 2 loading is 0.2 mol CO 2 /mol MDEA. Usually, the K G a v of the MDEA nanofluids can be increased by 10-37% in a randomly packed tower compared to that of the MDEA solution, which is consistent with the results from the bubbling reactors. However, when the CO 2 loading of absorption exceeds 50%, E becomes less than 1.0, which means that high CO 2 loading inhibits the enhancement effect of nanoparticles. In order to predict the mass transfer performance of MDEA nanofluid, a formula correlating E and various dimensionless operating parameters (i.e. L, T , Ĉnf and ĈMDEA ) is proposed and fitted with an average absolute deviation of 14%.

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Carbon dioxide capture using liquid absorption methods: a review

Ochedi

et al. 2020

Environ Chem Lett

212

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Performance simulations of MEA/NH3 based large-scale CO2 capture in packed columns under different flue gas parameters

Cited by 4 publications

References 33 publications

Chaotropic Effects in Sub/Supercritical Fluid Chromatography via Ammonium Hydroxide in Water-Rich Modifiers: Enabling Separation of Peptides and Highly Polar Pharmaceuticals at the Preparative Scale

Chaotropic Effects in Sub/Supercritical Fluid Chromatography via Ammonium Hydroxide in Water-Rich Modifiers: Enabling Separation of Peptides and Highly Polar Pharmaceuticals at the Preparative Scale

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Carbon dioxide capture using liquid absorption methods: a review

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Performance simulations of MEA/NH3 based large-scale CO2 capture in packed columns under different flue gas parameters

Cited by 4 publications

References 33 publications

Chaotropic Effects in Sub/Supercritical Fluid Chromatography via Ammonium Hydroxide in Water-Rich Modifiers: Enabling Separation of Peptides and Highly Polar Pharmaceuticals at the Preparative Scale

Chaotropic Effects in Sub/Supercritical Fluid Chromatography via Ammonium Hydroxide in Water-Rich Modifiers: Enabling Separation of Peptides and Highly Polar Pharmaceuticals at the Preparative Scale

Enhancement of mass transfer performance by nanoparticles during the CO2 absorption with MDEA solution in a randomly packed tower

Carbon dioxide capture using liquid absorption methods: a review

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Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower