- Long Chain Alkylated Ionic Liquids as Pour Point Depressant and Rheology Improver for Crude Oil
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Abstract: Cold flow properties of Iranian crude oil have been investigated by twodifferent imidazolium ionic liquids including 1-dodecyl-3-methylimidazoliumreduce the pour point up to bis(trifluoromethanesulfonyl) imide([C12min](NTf2]) and1-tetradecyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide([C14min](NTf2]).([C14min](NTf2]) showed highability to 12°C optimal performance by addition of 2000 ppm. Wax crystallizationbehaviour of untreated and treated crude oil was monitored using differentialscanning calorimetry (DSC) and the polarized optical microscopy (POM). Resultsfrom DSC and POM revealed that the presence of both ILs changes the process ofcrystallization and extends wax precipitation time. Furthermore, rheologicalbehaviour of the crude oil was improved and viscosity was decreased by 73% at23.5°C and 87% at 15°C by addition of[C14mim][NTf2].
- Hazrati,Abdouss,Miran-Beigi,Pasban
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p. 206 - 213
(2020/12/09)
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- Physicochemical Properties of Long Chain Alkylated Imidazolium Based Chloride and Bis(trifluoromethanesulfonyl)imide Ionic Liquids
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In this research synthesis, purification and characterization of six long-chain imidazolium based ionic liquids (ILs) including C10, C12, and C14 alkyl chain with chloride and NTf2 anions was investigated. All of these studied ILs were characterized using NMR, CHNSO, and DSC, and some impurities such as water, chloride, and metal contents were reported. The temperature dependence of some physicochemical properties such as density, dynamic and kinematic viscosity, refractive index, surface tension, and thermal stability of the synthesized ILs were also studied in the range 283.15 to 363.15 K, and the results were compared with those from the literature. Moreover, using the measured data, the thermal expansion coefficient and molar polarizability of the ILs were calculated. On the other hand the effects of alkyl chain length and anion were explained. The results revealed that although the refractive indices and viscosities increased as alkyl chain length increased, the density and surface tension results were reciprocally decreased. Besides, the results suggest that the synthesized ILs were the best choice as fuel additives.
- Hazrati, Nastaran,Abdouss, Majid,Miran Beigi, Ali Akbar,Pasban, Ali Asghar,Rezaei, Mahmoud
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p. 3084 - 3094
(2017/10/19)
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- Liquid-Crystalline Ionic Liquids as Ordered Reaction Media for the Diels–Alder Reaction
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Liquid-crystalline ionic liquids (LCILs) are ordered materials that have untapped potential to be used as reaction media for synthetic chemistry. This paper investigates the potential for the ordered structures of LCILs to influence the stereochemical outcome of the Diels–Alder reaction between cyclopentadiene and methyl acrylate. The ratio of endo- to exo-product from this reaction was monitored for a range of ionic liquids (ILs) and LCILs. Comparison of the endo:exo ratios in these reactions as a function of cation, anion and liquid crystallinity of the reaction media, allowed for the effects of liquid crystallinity to be distinguished from anion effects or cation alkyl chain length effects. These data strongly suggest that the proportion of exo-product increases as the reaction media is changed from an isotropic IL to a LCIL. A detailed molecular dynamics (MD) study suggests that this effect is related to different hydrogen bonding interactions between the reaction media and the exo- and endo-transition states in solvents with layered, smectic ordering compared to those that are isotropic.
- Bruce, Duncan W.,Gao, Yanan,Canongia Lopes, José Nuno,Shimizu, Karina,Slattery, John M.
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supporting information
p. 16113 - 16123
(2016/10/26)
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- Effect of ionic liquids on the conformation of a porphyrin-based viscometer
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Structure of the cationic and anionic counterparts of ionic liquids has a significant impact on the conformational bias of the porphyrin rotor; an apparent correlation between the conformation and the viscosity of ionic liquids was noted, albeit it was found to be distinct and more complex from that found in molecular solvents.
- Jameson, Laramie P.,Kimball, Joseph D.,Gryczynski, Zygmunt,Balaz, Milan,Dzyuba, Sergei V.
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p. 18300 - 18304
(2013/10/21)
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- Synthesis of imidazolium and pyridinium-based ionic liquids and application of 1-alkyl-3-methylimidazolium salts as pre-catalysts for the benzoin condensation using solvent-free and microwave activation
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An efficient one-pot procedure for the synthesis of ionic liquids based on nitrogen-containing heterocycles, imidazolium or pyridinium under 'green chemistry' conditions has been described. Imidazolium salts and DBU have been found to catalyze efficiently the benzoin condensation giving good yields within very short reaction time using solvent-free microwave activation conditions.
- Aupoix, Audrey,Pégot, Bruce,Vo-Thanh, Giang
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scheme or table
p. 1352 - 1356
(2010/04/02)
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