Deep eutectic solvents for extraction-desulphurization: A review

Chandran, Davannendran; Khalid, Mohammad; Walvekar, Rashmi; Mubarak, Nabisab Mujawar; Dharaskar, Swapnil; Wong, Wai Yin; Gupta, T. C. S. M.

doi:10.1016/j.molliq.2018.11.051

Cited by 155 publications

(63 citation statements)

References 75 publications

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“…All materials isolated in this way exhibited 1H and 13C NMR spectra in accord with the indicated structures. Other approaches toward preparation of ionic liquids that have been established in more recent times are might be useful for further exploration [ 22 , 23 , 24 ]. There exists wide capability to fine-tune the physical properties by simply changing the structure of the cation or the counterion [ 25 ].…”

Section: Methodsmentioning

confidence: 99%

Role of Heat Expansion with a Series of Ionic Liquids: The Case for Isochoric Thermoelectric Generators and Minimal Steric Repulsion

Jackson

Engel

Vuong

2019

Entropy

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The role of convection in liquid thermoelectric cells may be difficult to predict because the inter- and intramolecular interactions are not currently incorporated into thermodynamic models. Here, we study the thermoelectric response of a series of five anhydrous 1-methyl-3- alkylimidazolium halide ionic liquids with varied chain length and counterion in a high-aspect-ratio, horizontal-temperature-gradient geometry, where convection is minimal. While a canonical constant-volume thermodynamic model predicts that the longer aliphatic groups exhibit larger Seebeck coefficients, we instead measure the opposite: Longer aliphatic chains correlate with lower densities and greater heat expansion, stronger intermolecular associations, stronger steric repulsion, and lower Seebeck coefficients. As evidence of the critical role of thermal expansion, we measure that the Seebeck effect is nonlinear: Values of −2.8 mV/K with a 10 K temperature difference and −1.8 mV/K with a 50 K difference are measured with ether ion. Our results indicate that steric repulsion and heat expansion are important considerations in ionic liquid design; with large temperature differences, the Seebeck coefficient correlates negatively with heat expansion. Our results suggest that Seebeck values will improve if thermal expansion is limited in a pressurized, isochoric, convection-free design.

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Section: Methodsmentioning

confidence: 99%

Role of Heat Expansion with a Series of Ionic Liquids: The Case for Isochoric Thermoelectric Generators and Minimal Steric Repulsion

Jackson

Engel

Vuong

2019

Entropy

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“…These two components are a hydrogen bond acceptor (HBA) and a hydrogen bond donor (HBD). When the HBA and HBD are mixed together, a mixture is formed with a melting point that is much lower than those of the individual HBA and HBD [13][14][15][16]. Due to this, these novel solvents are named the deep eutectic solvents (DESs).…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, these novel solvents have attracted great attention due to their unique characteristics. Based on the desirable properties and advantages of DESs, some studies have suggested that DESs have the potential to be used for various applications in the industries, such as in extraction and separation processes, chromatography, biodiesel production, drug delivery systems and for introducing novel drugs [9,12,15,17,19,20]. Furthermore, DESs are designer solvents, i.e., suitable DESs possessing the desired (thermo-)physical properties can be designed by the engineered choice of the HBA, HBD and their molar ratios.…”

Section: Introductionmentioning

confidence: 99%

A Global Model for the Estimation of Speeds of Sound in Deep Eutectic Solvents

et al. 2020

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Deep eutectic solvents (DESs) are newly introduced green solvents that have attracted much attention regarding fundamentals and applications. Of the problems along the way of replacing a common solvent by a DES, is the lack of information on the thermophysical properties of DESs. This is even more accentuated by considering the dramatically growing number of DESs, being made by the combination of vast numbers of the constituting substances, and at their various molar ratios. The speed of sound is among the properties that can be used to estimate other important thermodynamic properties. In this work, a global and accurate model is proposed and used to estimate the speed of sound in 39 different DESs. This is the first general speed of sound model for DESs. The model does not require any thermodynamic properties other than the critical properties of the DESs, which are themselves calculated by group contribution methods, and in doing so, make the proposed method entirely independent of any experimental data as input. The results indicated that the average absolute relative deviation percentages (AARD%) of this model for 420 experimental data is only 5.4%. Accordingly, based on the achieved results, the proposed model can be used to predict the speeds of sound of DESs.

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“…Oxidation, adsorption, extraction and biodesulfurization are some of the alternative or complementary methods for HDS [5]. Among these, the extractive desulfurization has received special attention due to its convenient operating conditions (ambient temperature and pressure), easy separation of refined fuel and solvent and low cost [6][7][8][9][10][11][12][13]. Moreover, extraction is not a destructive method, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…does not change the quality of liquid fuels and chemical structure of valuable S-compounds in the fuel (which can be used as starting materials in different industries) [8,10]. Because the extraction process is significantly influenced by the type of extractant, extractive desulfurization (EDS) performance of different solvent has been investigated up to now [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Extractive desulfurization of liquid fuel using diamine-terminated polyethylene glycol as a very low vapour pressure and green molecular solvent

et al. 2020

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Removal of sulfur compounds from liquid fuel is one of the important issues in the field of energy and environment. Among the available methods, extractive desulfurization (EDS) is of great interest due to its convenient operating conditions. In this study, EDS performance of 4,7,10-trioxatridecane-1,13-diamine (TTD), a very low vapour pressure diamine-terminated oligomeric polyethylene glycol (PEG), was studied. Effect of the influencing factors, as well as multiple extraction, mutual solubility, reusability and regeneration of TTD were investigated. Results showed that the TTD/fuel volume ratio of 0.5 could extract benzothiophene, dibenzothiophene and dimethyl dibenzothiophene with the efficiencies 67%, 74% and 53%, respectively, in less than 1 min at ambient temperature. The distribution coefficient ( K N ) value for removal of dibenzothiophene by TTD was 3.66 higher than that of PEG, and it is similar to K N values (approx. 4) for polyethylene glycol dimethyl ether (as a modified PEG) and Lewis acid-containing ionic liquids. It was observed that spent TTD after five cycles could be regenerated using the back-extraction method. Also, deep EDS was achievable after three times extraction using fresh TTD. Finally, the extraction mechanism was studied using 1 H-NMR. These observations, as well as very low vapour pressure and insignificant dependency of TTD on the initial S-concentration of fuel and temperature, make this extractant to be introduced as a valuable option for green and effective EDS.

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Deep eutectic solvents for extraction-desulphurization: A review

Cited by 155 publications

References 75 publications

Role of Heat Expansion with a Series of Ionic Liquids: The Case for Isochoric Thermoelectric Generators and Minimal Steric Repulsion

Role of Heat Expansion with a Series of Ionic Liquids: The Case for Isochoric Thermoelectric Generators and Minimal Steric Repulsion

A Global Model for the Estimation of Speeds of Sound in Deep Eutectic Solvents

Extractive desulfurization of liquid fuel using diamine-terminated polyethylene glycol as a very low vapour pressure and green molecular solvent

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