Influence of Alkyl Substituent on Optical Properties of Carboxylate-Based Protic Ionic Liquids

Sharma, Gyanendra; Singh, Dharmendra; Rajamani, Sunita; Gardas, Ramesh L.

doi:10.1002/slct.201701878

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…The synthesis of the carboxylate-based protic ILs studied in this work was based on the Brønsted acid/base neutralization method, as reported by Sharma et al and Chennuri et al, in which the acid is added drop-by-drop to an equimolar quantity of a base under room-temperature conditions and under a nitrogen atmosphere and vigorous stirring. No additional purification steps, such as using vacuum and moderate temperatures, were performed in order to prevent the reported formation of azeotropes .…”

Section: Experimental Methods and Modelingmentioning

confidence: 99%

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO₂ Separation

Silva

Crespo

Martins

et al. 2022

Ind. Eng. Chem. Res.

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Protic ionic liquids (PILs) have been suggested as promising solvents for CO2 capture; however, their high viscosity and consequent poor mass transfer coefficients hinder their large-scale industrial application. To overcome this limitation, PILs (neat or encapsulated) can be incorporated into polymers coated on hollow fiber membranes, to be implemented in gas–liquid contactor units. However, before the immobilization of PIL-based solvents on membranes, fundamental studies on the CO2 sorption process in PILs are still mandatory. Here, the carboxylate-based PILs’ ability for CO2 absorption was evaluated using an isochoric solubility cell in a wide range of temperatures (303–343 K) and CO2 partial pressures (0–0.8 MPa). The experimental data revealed the existence of a distinct sorption mechanism than that typically observed in other low-volatile physical solvents, where the solubility was mainly affected by entropic effects. The soft-SAFT equation of state was further applied for modeling of the solubility data, which allowed us to infer the influence of the anion’s structure on the system’s interactions. Aiming to improve the process kinetics, the PILs were encapsulated in carbonaceous submicrocapsules, herein proposed as an efficient material for CO2 separation. To characterize the composition, morphology, porous structure, and thermal stability of the solvents used, SEM, TEM, TGA, BET, and elemental analyses were performed. The adsorption of CO2 on these materials showed that these materials retained the same sorption capacity as their neat counterparts and with considerably increased sorption rates. These materials also retained their performance after various sorption–desorption cycles and showed fast and complete regeneration and high sorption capacity, thus indicating their potential for CO2 capture.

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Section: Experimental Methods and Modelingmentioning

confidence: 99%

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO₂ Separation

Silva

Crespo

Martins

et al. 2022

Ind. Eng. Chem. Res.

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“…The synthesis of the carboxylate-based protic ILs has been detailed in previous publications [23,24]. To reduce the water content and volatile impurities, the ILs were dried and purified under vacuum (1 Pa) at room temperature for at least 48 h. The structures of the obtained compounds were analysed by 1 H and 13 C NMR e Fig.…”

Section: Protic Ionic Liquid Synthesismentioning

confidence: 99%

“…were included. Fifteen carboxylate-based protic ILs investigated by us before [23,24,31] were also added to the screening pool, due to the reported potential CO 2 capture capacity [32,33].…”

Section: Cosmo-rs Screeningmentioning

confidence: 99%

Selection and characterization of non-ideal ionic liquids mixtures to be used in CO2 capture

Martins

Sharma

Pinho

et al. 2020

Fluid Phase Equilibria

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Due to the costs involved, the capture of CO 2 in post-combustion is not currently seen as economically viable. Aiming at changing the perception of post-combustion CO 2 from a costly and non-profitable process to a valuable commodity and fostering the development of the next-generation of technologies, novel solvents and their mixtures have been investigated. In this work, mixtures of non-volatile ionic liquids were screened by COSMO-RS aiming to find mixtures with positive excess volumes that could present an increased CO 2 capture by physical sorption. The most promising mixtures identified by COSMO-RS, [C 4 C 1 im][DMP] or [C 4 C 1 im][NTf 2 ] þ carboxylate-based protic ILs were characterized through the measurement of their thermophysical properties, namely density and viscosity. Both properties were measured for pure ILs and their binary mixtures at different temperatures and compositions. The temperature dependence of density of pure ILs was described using the Gardas and Coutinho model while viscosity was accurately described using the VogelÀTammannÀFulcher equation. The Redlich-Kister equation was used to predict the excess molar volumes and the non-ideality of the mixtures' viscosity was assessed using the Grunberg and Nissan mixing law. The excess molar volumes for mixtures containing [C 4 C 1 im][DMP] show large positive values all over the range of compositions and temperatures, making them good candidates for CO 2 capture. To the best of our knowledge, the excess molar volumes obtained in this work were the highest reported so far. COSMO-RS was able to correctly predict the trend of the experimental excess molar volumes for these mixtures. Regarding viscosity, mixtures of [C 4 C 1 im] [DMP] with the carboxylate-based protic ILs led to the desired viscosity decrease compared to the pure aprotic IL, and large deviations from ideality were observed. The mixing of ILs is thus an efficient way to fine-tune the properties, in this case decreasing the viscosity while increasing the sorption capacity.

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Polar zwitterion/saccharide-based deep eutectic solvents for cellulose processing

Sharma

Takahashi

Kuroda

2021

Carbohydrate Polymers

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Influence of Alkyl Substituent on Optical Properties of Carboxylate-Based Protic Ionic Liquids

Cited by 9 publications

References 34 publications

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO₂ Separation

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO₂ Separation

Selection and characterization of non-ideal ionic liquids mixtures to be used in CO2 capture

Polar zwitterion/saccharide-based deep eutectic solvents for cellulose processing

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Influence of Alkyl Substituent on Optical Properties of Carboxylate-Based Protic Ionic Liquids

Cited by 9 publications

References 34 publications

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO2 Separation

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO2 Separation

Selection and characterization of non-ideal ionic liquids mixtures to be used in CO2 capture

Polar zwitterion/saccharide-based deep eutectic solvents for cellulose processing

Contact Info

Product

Resources

About

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO₂ Separation

Encapsulated Protic Ionic Liquids as Sustainable Materials for CO₂ Separation