Synthesis and selection of hindered new amine absorbents for CO2 capture

Chowdhury, Firoz Alam; Okabe, Hiroshi; Yamada, Hidetaka; Onoda, Masami; Fujioka, Yoshio

doi:10.1016/j.egypro.2011.01.042

Cited by 146 publications

(83 citation statements)

References 11 publications

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“…It is well known that bicarbonate formation occurs at a lower rate than carbamate formation while bicarbonate formation results in a large CO 2 absorption capacity [3]. However, we found that some 'moderately' hindered amines have combined desirable characteristics such as high rate and large capacity for CO 2 absorption [4,5]. In this work, we investigated aqueous solutions of alkanolamines by isothermal vapour-liquid equilibrium (VLE) measurements for CO 2 and by 13 C nuclear magnetic resonance (NMR) spectroscopic analyses.…”

Section: Introductioncontrasting

confidence: 39%

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Experimental study into carbon dioxide solubility and species distribution in aqueous alkanolamine solutions

et al. 2012

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We investigated the solubility of CO 2 in aqueous solutions of alkanolamines at 40C and 120C over CO 2 partial pressures ranging from a few kPa to 100 kPa to evaluate the potential for CO 2 capture from flue gas. CO 2 capacities were compared between monoethanolamine, N-ethyl ethanolamine and N-isopropyl ethanolamine. Speciation analyses were conducted in the alkanolamine solutions at different CO 2 loadings by accurate quantitative 13 C nuclear magnetic resonance spectroscopy. N-isopropyl ethanolamine showed a large capacity for CO 2 because of the formation of bicarbonate. However, we also found that at a lower CO 2 loading a significant amount of carbamate was present in the aqueous N-isopropyl ethanolamine solutions.

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Section: Introductioncontrasting

confidence: 39%

“…To maximise the capture efficiency and to reduce energy costs we previously developed CO 2 capture systems and high performance CO 2 absorbents [2][3][4][5]. Recently, we demonstrated that hindered amino alcohols for the promotion of CO 2 capture can be developed by rational molecular design and by the placement of functional groups [4,5].…”

Section: Introductionmentioning

confidence: 99%

Experimental study into carbon dioxide solubility and species distribution in aqueous alkanolamine solutions

et al. 2012

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“…The MEA result is in agreement with the result of a previous study. 15 On the other hand, TEA, a tertiary amine, that was shown to have the lowest absorption rate, presented the lowest heat of absorption, 44.71 kJ/mol CO 2 , while AMP showed 63.95 kJ/mol CO 2 . The heat of absorption was shown to be in the order of precedence of TEA < AMP < DEA < MEA.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Carbon Dioxide Absorption in Aqueous MEA, DEA, TEA, and AMP Solutions

Kim¹,

Lim²,

Jeong³

et al. 2013

Bulletin of the Korean Chemical Society

152

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The separation and capture process of carbon dioxide from power plants is garnering interest as a method to reduce greenhouse gas emissions. In this study, aqueous alkanolamine solutions were studied as absorbents for CO 2 capture. The solubility of CO 2 in aqueous alkanolamine solutions was investigated with a continuous stirred reactor at 313, 333 and 353 K. Also, the heat of absorption (−ΔH abs ) between the absorbent and CO 2 molecules was measured with a differential reaction calorimeter (DRC) at 298 K. The solubility and heat of absorption were determined at slightly higher than atmospheric pressure. The enthalpies of CO 2 absorption in monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), and 2-amino-2-methyl-1-propanol (AMP) were 88.91, 70.44, 44.72, and 63.95, respectively. This investigation showed that the heat of absorption is directly related to the quantity of heat for absorbent regeneration, and is dependent on amine type and CO 2 loading.

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“…The major challenge for the absorption process lies in the unfavorable economics, primarily due to the energy requirement for solvent regeneration [1,2]. Various aqueous solvent systems have been proposed by Chowdhury et al [3,4] to reduce the energy requirements, with only modest results. Some undisclosed solvents, which can allegedly cut the regeneration energy by 20-34 % compared to monoethanolamine (MEA) were reported by Goto et al [5] and Mangalapally et al [6], but the desorption still needs to be carried out at temperatures higher than 120°C.…”

Section: Motivationmentioning

confidence: 99%

Novel Thermomorphic Biphasic Amine Solvents for CO2 Absorption and Low-Temperature Extractive Regeneration

Zhang

Misch

Tan

et al. 2011

Chem. Eng. Technol.

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The key challenge in amine-based CO 2 capture from flue gases is to reduce the energy consumption required for solvent regeneration. Lipophilic amines exhibit a thermomorphic phase transition upon heating, giving rise to autoextractive behavior, which intensifies desorption at temperatures well below the boiling point of aqueous solutions. The low regeneration temperature of less than 80°C together with the high cyclic CO 2 loading capacity of ∼0.9 mol CO 2 mol absorbent -1 of such thermomorphic biphasic solvent (TBS) systems permit the use of low-value and even waste heat at temperatures below 100°C for desorption. In order to reduce the exergy demands still further, techniques for enhancing CO 2 release using extractive regeneration with inert solvent addition were investigated at temperatures of 40-50°C to permit the use of waste heat at temperatures of ∼70°C or less. The regeneration of 3 M absorbed lipophilic amine solutions with 0.93 mol mol -1 CO 2 loading by using various additional solvents and the evaluation of the extractive performance in multiple-stage crosscurrent and countercurrent configurations indicated the promise of adding certain hydrophobic solvents to enhance the low-temperature regeneration of TBS absorbents.

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Synthesis and selection of hindered new amine absorbents for CO2 capture

Cited by 146 publications

References 11 publications

Experimental study into carbon dioxide solubility and species distribution in aqueous alkanolamine solutions

Experimental study into carbon dioxide solubility and species distribution in aqueous alkanolamine solutions

Comparison of Carbon Dioxide Absorption in Aqueous MEA, DEA, TEA, and AMP Solutions

Novel Thermomorphic Biphasic Amine Solvents for CO2 Absorption and Low-Temperature Extractive Regeneration

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