Ionic Liquids: Methods of Degradation and Recovery

Siedlecka, Ewa Maria; Czerwicka, Małgorzata; Neumann, Jennifer; Stepnowski, Piotr; Fernández, J.F.; Thöming, Jorg

doi:10.5772/15463

Cited by 35 publications

(33 citation statements)

References 89 publications

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“…Summing up, in this work, it was demonstrated the capacity of Fenton oxidation to degrade ILs with a variety of cations and anions. However, it is notorious, from the present results and others previously reported in literature [6], that the best approach for dealing with an ionic liquid requires a simultaneous attention to the cation and the anion. Cyano-based ILs are good examples of problematic anions, where compounds more toxic than the original ions may result from the oxidation reaction.…”

Section: Microtox ® Acute Toxicity Assaysmentioning

confidence: 41%

“…It can thus be expected the presence of ILs in aqueous industrial effluents related with their manufacture and use. Various authors reported successful studies on the IL's recovery and recyclability after some specific processes for several consecutive cycles [3][4][5] being the main criteria for the choice of the IL recovery process, the IL concentration [6,7]. However, their recyclability may be limited to a certain number of cycles by the accumulation of the contaminant/impurities which concentration may become too high rendering them unusable [6].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover the IL recovery may not be practical when dealing with dilute solutions [6]. In this context, the development of efficient chemical treatments for the degradation of such persistent, nonbiodegradable and/or high toxic compounds has been the focus of considerable research efforts in the last few years [8], principally for water streams with low amounts of IL.…”

Section: Introductionmentioning

confidence: 99%

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Role of the chemical structure of ionic liquids in their ecotoxicity and reactivity towards Fenton oxidation

Muñoz

Domı́nguez

Pedro

et al. 2015

Separation and Purification Technology

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: The efficacy of the process was evaluated by the analysis of the chemical oxygen demand (COD), total organic carbon (TOC), the acids formed by ILs oxidation and the toxicity of the non-treated and treated aqueous effluents towards the Vibrio fischeri bacteria. It was possible to identify the main compounds produced upon Fenton oxidation in the final aqueous effluents (acetic, oxalic and formic acids) and the results seem to suggest that the Fenton oxidation is a good degradation methodology for most of the ILs tested, achieving TOC conversions in the range of 40-80% and 30-40% for aromatic and aliphatic ILs, respectively. Furthermore, non-toxic effluents were obtained at the end of the treatment for all the ILs investigated with the exception of the cyano-based ones due to the release of highly toxic cyanide species to the aqueous medium.

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Section: Microtox ® Acute Toxicity Assaysmentioning

confidence: 41%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of the chemical structure of ionic liquids in their ecotoxicity and reactivity towards Fenton oxidation

Muñoz

Domı́nguez

Pedro

et al. 2015

Separation and Purification Technology

View full text Add to dashboard Cite

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“…ILs are known for their negligible vapor pressure and non-flammability under ambient conditions, high thermal conductivity, high polarity, high heat capacity, high density, extremely low volatility and thermal stability (Domanska 2005;Siedlecka et al 2011;Keith and Johnson 2007;Bermudez et al 2009). They have many advantages over organic surfactants.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of ionic liquids for chemical enhanced oil recovery

Dahbag

AlQuraishi

Benzagouta

2014

J Petrol Explor Prod Technol

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Substantial amount of crude oil remains in the reservoir after primary and secondary production. Chemical flooding is one of the enhanced oil recovery (EOR) methods; however, chemicals (i.e., Surfactant) used are sensitive to the harsh environment characterizing the local reservoirs. The current study aimed at investigating the utilization of ionic liquids (ILs), known as environment friendly salt with good solubility, thermal stability and effective surface activity, as an alternative to conventional organic surfactants in enhanced oil recovery process. In this work, screening tests of nine ILs were performed. These ILs were diluted in different brine solutions of different salt compositions at 10 % (w/w) salinity and their solubility, thermal stability and surface activity in presence of Saudi medium crude oil were tested. Tetra alkyl ammonium sulfate known as Ammoeng 102 was found to be the ionic liquid of choice. Further investigations on Ammoeng 102 solutions at 10 and 20 % (w/w) salinity were conducted and IFT measurements indicate enhanced surface activity of Ammoeng 102 with increasing solution salinity. Effects of pressure and temperature on interfacial tension (IFT) were also tested and the results indicate minor effects. Adsorption test indicates high Ammoeng 102 adsorption tendency with more adsorption for higher salinity solution. Different flooding scenarios were conducted in sandstone rock samples to investigate the effectiveness of Ammoeng 102 IL as an EOR chemical. The findings indicate promising results for ionic solution flooding in secondary mode at irreducible water saturation (S wirr ). Ultimate recovery obtained is higher than that obtained with combined secondary brine flooding followed by tertiary ionic solution flooding at residual oil saturation (S or ). Injection of slug of ionic solution in secondary mode provides lower recovery compared to that recovered with continuous ionic solution injection in the same mode. Rock water content affects recovery efficiency indicating higher oil recovery for secondary brine and tertiary ionic solution flooding at low S wirr . Contact angle and relative permeability measurements demonstrate the role of wettability alteration behind the extra oil recovery which is very much affected by ionic liquid concentration that can be altered by dilution with formation and injected brines.

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“…Even more forceful conditions, i.e. the use of NaOH (1 equ., 1M), lead to total decomposition of these salts (which might be of interest for the degradation of ionic liquids in order to address ecological concerns [2]),but no products were identified. Single crystals were obtained after 4daysat20°Casfine needles from this aqueous solution.T heyw erew ashedw ithH 2 Oa nd dried(yield23%;m.p.…”

Section: Source Of Materialsmentioning

confidence: 99%