Effect of anion on thermophysical properties of N , N -diethanolammonium based protic ionic liquids

Sarkar, Anirban; Sharma, Gyanendra; Singh, Dharmendra; Gardas, Ramesh L.

doi:10.1016/j.molliq.2017.07.025

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…The thermal expansion coefficients were found to be quite consistent over the temperature range studied and therefore are considered to be temperature independent. The pattern of the results is consistent with other types of ionic liquids [27,28,36,40,41]. The molecular volume, Vm, of the [BA] ionic liquid was greater than that of [AC] for a fixed cation and this may be attributed to the presence of additional CH2 groups [36,37].…”

Section: Resultssupporting

confidence: 82%

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

et al. 2019

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Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium [EtOHA], tributylammonium [TBA], bis(2-ethylhexyl)ammonium [BEHA] cations, and acetate [AC] and butyrate [BA] anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, , and dynamic viscosity, , were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, p, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 C.min‒1. The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, [BEHA][BA] had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while [BEHA] ionic liquids have higher affinity towards CO2 followed by [TBA] and [EtOHA] ionic liquids.

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Section: Resultssupporting

confidence: 82%

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

et al. 2019

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“…Meanwhile, the behavior of the thermal expansion coefficient is almost similar for all PILs with common cations. Sarkar et al have also reported a similar variation trend of the thermal expansion coefficient for diethylammonium-based PILs [ 19 ]. To conclude, the thermal expansion coefficient can be considered as temperature independent as it shows similar results over the temperature range studied.…”

Section: Resultsmentioning

confidence: 67%

“…Figure 2 shows the examples of DSC curves for the ammonium-based PILs synthesized in this study. Data show that all PILs possess a glass transition temperature (T g ) ranging from −98.37 °C to −90.89 °C, which indicates that all PILs experience the flow of heat from amorphous glass to liquid state [ 19 ]. As T g represents the cohesive energy of the sample, PILs that exhibit T g values have low cohesive energy that could contribute to advantageous physiochemical properties such as low viscosity and high ionic conductivity [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, membrane separation processes are also used commercially for CO 2 removal from natural gas. However, a single-stage membrane system is not capable of capturing CO 2 with high efficiency [ 15 , 16 , 17 , 18 , 19 , 20 ]. Due to the given issue, this had encouraged researchers to find alternative solvents that can capture CO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, data on solvents’ viscosity is important for the designing of industrial processes related to heat and mass transfer as well as dissolution of compounds in solvents [ 36 ]. Several research groups have also investigated and provided discussion on the temperature-dependent properties of protic ionic liquids prior to the utilization of ionic liquids in various applications [ 19 , 22 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Thermophysical Properties of Ammonium-Based Protic Ionic Liquids and Their Potential Ability towards CO2 Capture

et al. 2022

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Ionic liquids, which are extensively known as low-melting-point salts, have received significant attention as the promising solvent for CO2 capture. This work presents the synthesis, thermophysical properties and the CO2 absorption of a series of ammonium cations coupled with carboxylate anions producing ammonium-based protic ionic liquids (PILs), namely 2-ethylhexylammonium pentanoate ([EHA][C5]), 2-ethylhexylammonium hexanoate ([EHA][C6]), 2-ethylhexylammonium heptanoate ([EHA][C7]), bis-(2-ethylhexyl)ammonium pentanoate ([BEHA][C5]), bis-(2-ethylhexyl)ammonium hexanoate ([BEHA][C6]) and bis-(2-ethylhexyl)ammonium heptanoate ([BEHA][C7]). The chemical structures of the PILs were confirmed by using Nuclear Magnetic Resonance (NMR) spectroscopy while the density (ρ) and the dynamic viscosity (η) of the PILs were determined and analyzed in a range from 293.15K up to 363.15K. The refractive index (nD) was also measured at T = (293.15 to 333.15) K. Thermal analyses conducted via a thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC) indicated that all PILs have the thermal decomposition temperature, Td of greater than 416K and the presence of glass transition, Tg was detected in each PIL. The CO2 absorption of the PILs was studied up to 29 bar at 298.15 K and the experimental results showed that [BEHA][C7] had the highest CO2 absorption with 0.78 mol at 29 bar. The CO2 absorption values increase in the order of [C5] < [C6] < [C7] anion regardless of the nature of the cation.

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Influence of temperature and alkyl chain length on physicochemical properties of trihexyl- and trioctylammonium based protic ionic liquids

Keshapolla

Kancharla

Gardas

2019

The Journal of Chemical Thermodynamics

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Effect of anion on thermophysical properties of N , N -diethanolammonium based protic ionic liquids

Cited by 14 publications

References 34 publications

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

Experimental Investigation on Thermophysical Properties of Ammonium-Based Protic Ionic Liquids and Their Potential Ability towards CO2 Capture

Influence of temperature and alkyl chain length on physicochemical properties of trihexyl- and trioctylammonium based protic ionic liquids

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