Heat of absorption of carbon dioxide in mixtures of 2-amino-2-methyl-1-propanol and organic solvents

Svensson, Helena; Velasco, Vanessa Zejnullahu; Hulteberg, Christian; Karlsson, Hans T.

doi:10.1016/j.ijggc.2014.08.022

Cited by 33 publications

(25 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is in agreement with the literature, where same has been reported for several solvent systems (Arshad et al, 2013;Kim and Svendsen, 2011;Svensson et al, 2014).…”

Section: Resultssupporting

confidence: 93%

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Knuutila

Nannestad

2017

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

show abstract

“…This is in agreement with the literature, where same has been reported for several solvent systems (Arshad et al, 2013;Kim and Svendsen, 2011;Svensson et al, 2014).…”

Section: Resultssupporting

confidence: 93%

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Knuutila

Nannestad

2017

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

show abstract

“…To improve the amine scrubbing process, current research is focusing on reducing the energy demand in the stripper through the development of new amine solvents and improved heat integration measures in the process. Research is also carried out on ways to utilize excess heat, for the regeneration of the solvent, with new systems proposed for biogas upgrading that can be regenerated at lower temperature compared to the conventionally used amine solvents [9,10].…”

Section: Introductionmentioning

confidence: 99%

Assessment of zeolite 13X and Lewatit® VP OC 1065 for application in a continuous temperature swing adsorption process for biogas upgrading

Sonnleitner

Schöny

Hofbauer

2017

Biomass Conv. Bioref.

View full text Add to dashboard Cite

Two commercially available CO 2 -adsorbent materials (i.e., zeolite 13X (13X) and Lewatit® VP OC 1065 (Lewatit)) were evaluated for their applicability in a continuous temperature swing adsorption (TSA) process for biogas upgrading. The equilibrium adsorption characteristics of carbon dioxide and methane were determined by fixed bed and TGA tests. While relatively high CO 2 capacities were measured for both materials (3.6 and 2.5 mol kg), neither of them was found to adsorb significant amounts of CH 4 . Lewatit showed to be fully regenerable at 95°C, whereas for 13X, the regeneration was not complete at this temperature. However, 13X showed no degradation up to 190°C, whereas Lewatit started to degrade at 110 and 90°C when exposed to N 2 and air, respectively. Fluidization tests showed that Lewatit provides a high mechanical stability, while on the contrary, the tested 13X showed considerable attrition. An equilibrium adsorption model was fitted to the measured CO 2 adsorption data. The adsorption model was then integrated into an existing simulation tool for the proposed TSA process to roughly estimate the expectable regeneration energy demand for both materials. It was found that depending on the operating conditions, the regeneration energy demand lies between 0.32-0.54 kWh th /m 3 prodgas for 13X and 0.71-1.10 kWh th /m 3 prodgas for Lewatit. Since heat integration measures were not considered in the simulations, it was concluded that the proposed TSA process has a great potential to reduce the overall energy demand for biogas upgrading and that both tested adsorbent materials may be suitable for application in the proposed TSA process.

show abstract

“…In addition, the computed enthalpies of reaction, ΔH r , which range from −133.3 kJ/mol (Li + ) to −73.2 kJ/mol (K + ), agree well with experimental values of alkyl amines measured elsewhere in aprotic solvents without added co-salts. 20 Overall, these results highlight the central role of the alkali cations in driving key shifts in equilibrium speciation of the EEA−CO 2 adducts, which are necessary for the subsequent electrochemical activity to be observed.…”

Section: ■ Results and Discussionmentioning

confidence: 71%

“…In addition, the computed enthalpies of reaction, DH r , which range from -133.3 kJ/mol (Li + ) to -73.2 kJ/mol (K + ), agree well with experimental values of alkyl amines measured elsewhere in aprotic solvents without added co-salts. 20 Overall, these results highlight the central role of the alkali cations in driving key shifts in equilibrium speciation of the EEA-CO 2 adducts which are necessary for the subsequent electrochemical activity to be observed. Figure S7, consistent with the DFT calculations, the N-COOstretching vibration shifted from a higher wavenumber for Li carbamate (~1321 cm -1 ), to lower wavenumbers for Na (~1311 cm -1 ) and K (~ 1309 cm -1 ) carbamate.…”

Section: Equilibrium Speciation Of Co 2 -Loaded Eea With Varying Saltmentioning

confidence: 71%

“…Realizing such a combined capture-conversion approach, however, requires a sorbent with a CO 2 binding strength that is neither too strong (impractically stabilizing the CO 2 ) nor too weak. Amines, a motif abundantly studied in literature for promoting CO 2 chemical interactions, are promising in this regard due to their moderate chemisorption of CO 2 (−65 to −80 kJ/mol CO 2 ) in both aqueous , and nonaqueous media, , which has been widely exploited for applications in CO 2 capture. ,− In those applications, CO 2 is typically regenerated by thermally induced N–C bond cleavage at elevated temperatures (e.g., 100–120 °C), followed by compression for long-term storage or downstream utilization. Until recently, however, it has remained an open question whether amines can be utilized to promote direct electrochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Promoting Amine-Activated Electrochemical CO₂ Conversion with Alkali Salts

et al. 2019

View full text Add to dashboard Cite

Amine-based CO 2 chemisorption has been a longstanding motif under development for CO 2 capture applications, but large energy penalties are required to thermally cleave the N-C bond and regenerate CO 2 for subsequent storage or utilization. Instead, it is attractive to be able to directly perform electrochemical reactions on the amine solutions with loaded CO 2. We recently found that such a process is viable in dimethyl sulfoxide (DMSO) if an exogenous Li-based salt is present, leading to formation of CO 2-derived products through electrochemical N-C bond cleavage. However, the detailed influence of the salt on the electrochemical reactions was not understood. Here, we investigate the role of individual electrolyte salt constituents across multiple cations and anions in DMSO to gain improved insight into the salt's role in these complex electrolytes. While the anion appears to have minor effect, the cation is found to strongly modulate the thermochemistry of the amine-CO 2 through electrostatic interactions: 1 H NMR measurements show that post-capture, pre-reduction equilibrium proportions of the formed cation-associated carbamate vary by up to five-fold, and increase with the cation's Lewis acidity (e.g. from K + → Na + → Li +). This trend is quantitatively supported by DFT calculations of the free energy of formation of these alkali-associated adducts. Upon electrochemical reduction, however, the current densities follow an opposing trend, with enhanced reaction rates obtained with the lowest Lewis-acidity cation, K +. Meanwhile, molecular dynamics simulations indicate significant increases in desolvation and pairing kinetics that occur with K +. These findings suggest that, in addition to strongly affecting the speciation of amine-CO 2 adducts, the cation's pairing with-COOin the amine-CO 2 adduct can significantly hinder or enhance the rates of electrochemical reactions at moderate overpotentials. Consequently, designing electrolytes to promote fast cation-transfer appears important for obtaining higher current densities in future systems.

show abstract

Heat of absorption of carbon dioxide in mixtures of 2-amino-2-methyl-1-propanol and organic solvents

Cited by 33 publications

References 16 publications

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Assessment of zeolite 13X and Lewatit® VP OC 1065 for application in a continuous temperature swing adsorption process for biogas upgrading

Promoting Amine-Activated Electrochemical CO₂ Conversion with Alkali Salts

Contact Info

Product

Resources

About

Heat of absorption of carbon dioxide in mixtures of 2-amino-2-methyl-1-propanol and organic solvents

Cited by 33 publications

References 16 publications

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Assessment of zeolite 13X and Lewatit® VP OC 1065 for application in a continuous temperature swing adsorption process for biogas upgrading

Promoting Amine-Activated Electrochemical CO2 Conversion with Alkali Salts

Contact Info

Product

Resources

About

Promoting Amine-Activated Electrochemical CO₂ Conversion with Alkali Salts