Imidazolium dialkylphosphates—a class of versatile, halogen-free and hydrolytically stable ionic liquids

Kuhlmann, Esther; Himmler, Simone; Giebelhaus, Heidi; Wasserscheid, Peter

doi:10.1039/b611974c

Cited by 137 publications

(71 citation statements)

References 19 publications

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“…Such a density behavior in a homolog series of asymmetric imidazolium-based ionic liquids is also well documented in many literatures. 7,11,23,30,31 As expected, in a homologous series of RTILs, the molar volume increased with the increase of the chain length of the alkyl group or groups on the cation and/or the anion, as going from [ . The correlation of the molar volume with the alkyl chain length is well described in the literatures.…”

Section: Resultsmentioning

confidence: 79%

“…21,22 In this context, dialkylimidazolium alkylphosphites and dialkylimidazolium dialkylphosphates with a basic anion deserve to receive a great attention because of their easy and cost-effective preparation and high stability toward hydrolysis. 23 Herein, we wish to report in detail on the capability of a series of dialkylimidazolium alkylphosphites and dialkylimidazolium dialkylphosphates to capture CO2. The Krichevsky-Kasarnovsky equation was employed to derive the CO2 solubility parameter (Henry's law coefficient) from the solubility data measured at elevated pressures.…”

Section: Introductionmentioning

confidence: 99%

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Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO₂Absorbents

2009

Bulletin of the Korean Chemical Society

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Solubilities of carbon dioxide (CO2) in a series of fluorine-free room temperature ionic liquids (RTILs), dialkylimidazolium dialkylphosphates and dialkylimidazolium alkylphosphites, were measured at 313∼333 K and pressures up to 5 MPa. Henry's law coefficients as the solubility parameter of CO2 in RTILs were derived from the isotherm of fugacity versus CO2 mole fraction. The CO2 solubility in a phosphorus-containing RTIL was found to increase with the increasing molar volume of the RTIL. In general, dialkylimidazolium dialkylphosphate exhibited higher absorption capacity than dialkylimidazolium alkylphosphite as long as the RTILs possess an identical cation. Among RTILs tested, 1-butyl-3-methylimidazolium dibutylphosphate [BMIM][Bu2PO4] and 1-butyl-3-methylimidazolium butylphosphite [BMIM][BuHPO3] exhibited similar Henry's law coefficients to 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([BMIM][Tf2N]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), respectively. The Krichevsky-Kasarnovsky equation was employed to derive the CO2 solubility parameter (Henry's law coefficient) from the solubility data measured at elevated pressures.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO₂Absorbents

2009

Bulletin of the Korean Chemical Society

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“…Alternatively, it has been demonstrated that increasing the alkoxy chain length of a cation species decreases the viscosity of an IL [39,40,[53][54][55][56][57][58][59][60][61][62]. Kuhlmann and colleagues reported that increasing the chain length of a series of ethylene glycolfunctionalized imidazolium cations decreased the viscosity of the corresponding ILs [56].…”

Section: Viscositymentioning

confidence: 98%

Separating Rare-Earth Elements with Ionic Liquids

Mehio

Luo

Do‐Thanh

et al. 2016

Green Chemistry and Sustainable Technology

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The rare-earth elements (REEs) are a group of 17 chemically similar metallic elements; this group consists of scandium, yttrium, and 15 lanthanides. Due to their essential role in permanent magnets, lamp phosphors, catalysts, and rechargeable batteries, the REEs have become an essential component of the global transition to a green economy. Currently, with China producing over 90 % of the global REE output and its increasingly tightening export quota, the rest of the world is confronted with the potential risk of REE shortage. As such, many countries will have to rely on recycling REEs from pre-consumer scrap, industrial residues, and REE-containing end-of-life products. Over the course of the last two decades, ionic liquids have been increasingly used to separate REEs in the recycling process. Ionic liquids (ILs) are a class of molten salts that are liquid at temperatures below 100 C. ILs are amenable to the recycling of REEs because the cation and anion components are readily tailored to a given process, and they offer numerous advantages over typical organic solvents, such as low volatility, low flammability, a broad temperature range of stability, the ability to dissolve both inorganic and organic compounds, high conductivity, and wide electrochemical windows. In this chapter, we discuss the performance of several IL-based extraction systems used to separate and recycle REEs.

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“…Sugarcane bagasse was obtained from a local sugar factory (Zhanjiang, China). The ionic liquids [Bmim]Cl, [Emim]Ac and [Emim]DEP were synthesized as described in previous literature [5][6][7], and their structure were verifed by FT-IR and 1 H NMR. All other reagents and solvents were of analytical grade.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Structural Modification of Sugarcane Bagasse Cellulose Regenerated from Three Imidazolium-Based Ionic Liquids

Cui¹,

Wei²,

Fu³

et al. 2017

Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017)

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Abstract. Sugarcane bagasse cellulose (SBC) was dissolved in three imidazoliumBoth the original and regenerated SBC samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The results showed that the crystal structure of SBC was rearranged from cellulose I to cellulose II after regeneration from all the three ILs, but different IL leads to a different degree of crystallinity index (CrI) reduction. The CrI of SBC regenerated from [Bmim]Cl was significantly decreased from 73.35% to 25.08%, which is the lowest in all samples. Surprisingly, the CrI value of regenerated SBC from [Emim]DEP was just a little higher than that of [Bmim]Cl, although the dissolution time of [Emim] DEP is much shorter than that of [Bmim]Cl. It was also found that the regenerated SBC from [Emim]DEP had better thermal stability when compared with the untreated and regenerated SBC from the other two ILs.

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Imidazolium dialkylphosphates—a class of versatile, halogen-free and hydrolytically stable ionic liquids

Cited by 137 publications

References 19 publications

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO₂Absorbents

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO₂Absorbents

Separating Rare-Earth Elements with Ionic Liquids

Comparison of Structural Modification of Sugarcane Bagasse Cellulose Regenerated from Three Imidazolium-Based Ionic Liquids

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Imidazolium dialkylphosphates—a class of versatile, halogen-free and hydrolytically stable ionic liquids

Cited by 137 publications

References 19 publications

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO2Absorbents

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO2Absorbents

Separating Rare-Earth Elements with Ionic Liquids

Comparison of Structural Modification of Sugarcane Bagasse Cellulose Regenerated from Three Imidazolium-Based Ionic Liquids

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Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO₂Absorbents

Fluorine-Free Imidazolium-Based Ionic Liquids with a Phosphorous-Containing Anion as Potential CO₂Absorbents