- Temperature dependence of physical properties of ionic liquid 1,3-dimethylimidazolium methyl sulfate
-
This paper reports on the synthesis of the ionic liquid 1,3-dimethylimidazolium methyl sulfate [MMIM][MeSO4]. Experimental densities, speed of sounds, and refractive indices were determined from (283.15 to 343.15) K. Dynamic viscosities were measured from (293.15 to 343.15) K. Surface tensions were measured from (288.15 to 313.15) K. The coefficient of thermal expansion and molecular volume of [MMIM][MeSO4] were calculated from experimental values of density.
- Pereiro, Ana B.,Santamarta, Francisco,Tojo, Emilia,Rodriguez, Ana,Tojo, Jose
-
-
Read Online
- Studies of Volumetric and Viscosity Properties in Aqueous Solutions of Imidazolium Based Ionic Liquids at Different Temperatures and at Ambient Pressure
-
The ionic liquids (ILs) 1,3-dimethyl imidazolium methyl sulfate [MIm][MeSO4] and 1-ethyl-3-methyl imidazolium ethyl sulfate [EMIm][EtSO4] have been synthesized and characterized by 1H NMR, 13C NMR, mass spectrometry, TGA and DSC methods. The densities and viscosities of binary aqueous solutions of [MIm][MeSO4] (0.02458 to 0.18922?mol·kg?1) and [EMIm][EtSO4] (0.01044 to 0.21261?mol·kg?1) are reported at (293.15, 298.15 and 303.15) K and at ambient pressure. Apparent and partial molar volumes of the studied ILs are calculated at the studied concentrations. The limiting partial molar volumes of the studied ILs were obtained using an appropriate extrapolation method. The limiting apparent molar expansivity values at 298.15?K are also obtained. The relative viscosity data are analyzed by applying the Jones–Dole equation and Vand’s equations. Positive viscosity A and B coefficients were observed for both studied ILs, while the D coefficients were also found to be necessary, showing specific behavior depending upon the solute–solute interactions. Calculations of the B coefficients for anions are reported. The application of Vand’s equation to the viscosity data enabled us to calculate the Einstein–Simha factor (ν) and particle interaction coefficient (Q) for the ion-pairs. The calculated ν values are found to be less than Einstein’s value of 2.5. The results are discussed from the points of view of the water structure making effect, solute–solvent hydrogen bond interaction and the presence of hydrophobic interaction.
- Patil, Pankaj D.,Shaikh, Vasim R.,Gupta, Gaurav R.,Hundiwale, Dilip G.,Patil, Kesharsingh J.
-
-
Read Online
- USE OF IONIC LIQUIDS IN COMPOSITIONS FOR GENERATING OXYGEN
-
The present invention is directed to the use of an ionic liquid as a dispersant or solvent and as a heat sink in a composition for generating oxygen, the composition further comprising at least one oxygen source formulation, and at least one metal oxide compound formulation, wherein the oxygen source formulation comprises a peroxide compound, the ionic liquid is in the liquid state at least in a temperature range from ?10° C. to +50° C., and the metal oxide compound formulation comprises a metal oxide compound which is an oxide of one single metal or of two or more different metals, said metal(s) being selected from the metals of groups 2 to 14 of the periodic table of the elements.
- -
-
-
- METHOD FOR GENERATING OXYGEN FROM COMPOSITIONS COMPRISING IONIC LIQUIDS
-
The present invention is directed to a method for generating oxygen comprising providing at least one oxygen source, providing at least one ionic liquid, providing at least one metal oxide compound, wherein the oxygen source is a peroxide compound, the ionic liquid is in the liquid state at least in the temperature range from ?10° C. to +50° C., and the metal oxide compound is an oxide of one single metal or of two or more different metals, said metal(s) being selected from the metals of groups 2 to 14 of the periodic table of the elements, and contacting the oxygen source, the ionic liquid, and the metal oxide compound.
- -
-
-
- Salidroside analog (4,4-di-(4-hydroxyphenyl)amyl-beta-D-glucopyranoside) and synthesis method thereof
-
The invention belongs to the field of catalytic synthesis, and particularly relates to salidroside analog (4,4-di-(4-hydroxyphenyl)amyl-beta-D-glucopyranoside) and a preparation method thereof. The structural formula of the 4,4-di-(4-hydroxyphenyl)amyl-be
- -
-
Paragraph 0009; 0024
(2018/04/21)
-
- Method for synthesizing salidroside by using [Rmim][OSO2OR]-Lewis acid ionic liquid system
-
The invention belongs to the technical field of catalytic synthesis and particularly relates to a method for synthesizing salidroside by using a [Rmim][OSO2OR]-Lewis acid ionic liquid system. According to the method, the salidroside compound is synthesized by using ionic liquid [Rmim][OSO2OR]. The synthesis of the ionic liquid provided by the invention needs only a one-step reaction, and atoms ofraw materials in a synthetic reaction of the ionic liquid are utilized by 100%, and thus, the reaction is an atomic-economical-efficiency reaction with simple and convenient operation. The method provided by the invention is environmentally friendly and is mild in reaction conditions and simple in aftertreatment, the problems such as environmental pollution caused by tedious synthesis of the ionicliquid used during the existing O-Glycosylation of a glycosyl trichloroacetimidate donor by using an ionic liquid system, thermal energy consumption, atom waste and a non-atomic-economical-efficiencyreaction are solved, and meanwhile, the problems such as environmental pollution and tedious aftertreatment caused by the existing salidroside drug chemical-synthesis in organic solvents are solved.
- -
-
Paragraph 0024
(2018/04/26)
-
- Correlation between hydrogen bond basicity and acetylene solubility in room temperature ionic liquids
-
Room temperature ionic liquids (RTILs) are proposed as the alternative solvents for the acetylene separation in ethylene generated from the naphtha cracking process. The solubility behavior of acetylene in RTILs was examined using a linear solvation energy relationship based on Kamlet-Taft solvent parameters including the hydrogen-bond acidity or donor ability (α), the hydrogen-bond basicity or acceptor ability (β), and the polarity/polarizability (π*). It is found that the solubility of acetylene linearly correlates with β value and is almost independent of α or π*. The solubility of acetylene in RTILs increases with increasing hydrogen-bond acceptor (HBA) ability of the anion, but is little affected by the nature of the cation. Quantum mechanical calculations demonstrate that the acidic proton of acetylene specifically forms hydrogen bond with a basic oxygen atom on the anion of a RTIL. On the other hand, although C-H???π interaction is plausible, all optimized structures indicate that the acidic protons on the cation do not specifically associate with the π cloud of acetylene. Thermodynamic analysis agrees well with the proposed correlation: the higher the β value of a RTIL is, the more negative the enthalpy of acetylene absorption in the RTIL is.
- Palgunadi, Jelliarko,Hong, Sung Yun,Lee, Jin Kyu,Lee, Hyunjoo,Lee, Sang Deuk,Cheong, Minserk,Kim, Hoon Sik
-
experimental part
p. 1067 - 1074
(2011/06/19)
-
- Process for the Preparation of Onium Alkylsulfites
-
The invention relates to a process for the preparation of onium alkylsulfites by reaction of an onium halide or carboxylate with a symmetrically substituted dialkyl sulfite or with an asymmetrically substituted dialkyl sulfite at temperatures of 0 to 70° C.
- -
-
Page/Page column 8-9
(2008/12/07)
-
- METHOD FOR PRODUCING ONIUM ALKYL SULFATES WITH A LOW HALOGENIDE CONTENT
-
The invention relates to a method for producing onium alkyl sulfates by reacting an onium halogenide with a symmetrically substituted dialkyl sulfate, the alkyl group thereof containing between 1 and 14 C atoms, with an unsymmetrically substituted dialkyl sulfate, one alkyl group containing between 4 and 20 C atoms, and the second alkyl group being methyl or ethyl, with an alkyl-trialkylsilyl sulfate, with an alkylacyl sulfate, or with an alkylsulfonyl sulfate, the reaction with the dialkyl sulphate taking place at room temperature.
- -
-
Page/Page column 20
(2008/06/13)
-
- Halogenide-free preparation of ionic fluids
-
Preparation of ionic liquids (I) involves alkylating an amine, phosphine, imidazole, pyridine, triazole or pyrazole corresponding to the cation of (I) with a sulfate diester (II), then replacing the sulfate anion by the anion of (I). Preparation of ionic liquids of formula (I) involves alkylating the amine, phosphine, imidazole, pyridine, triazole or pyrazole, corresponding to the cation A, with a sulfate diester of formula (II), then replacing the sulfate anion R4SO4 or R5SO4 by the anion Yn-. (An).(Yn-) (I) R4SO2R5 (II) n = 1 or 2; Yn- = BF4, BCl4, PF6, SbF6, AsF6, AlCl4, ZnCl3, CuCl2, SO4, CO3, R'COO, R'SO3 or (R'SO2)2N; R' = 1-12C linear, branched or cyclic alkyl, 5-18C aryl, (5-18C) aryl-(1-6C) alkyl or (1-6C) alkyl-(5-18C) aryl (all optionally halo-substituted); A = NR1R2R3R or PR1R2R3R; or 1-(R)-3-(R1)-imidazolium, (R1)-substituted 1-(R)-pyridinium, 1-(R)-2-(R1)-pyrazolium or 1-(R)-1,3,5-triazolium (all optionally ring-substituted by one or more of 1-6C alkyl, 1-6C alkoxy, 1-6C aminoalkyl, 5-12C aryl or (5-12C) aryl-(1-6C) alkyl); R1-R3 = H; 1-20C linear, branched or cyclic alkyl; Het or Het-(1-6C) alkyl; or Ar or Ar-(1-6C) alkyl; R, R4, R5 = 1-24C linear, branched or cyclic alkyl; Het-(1-6C) alkyl; or Ar'-(1-6C) alkyl; Het = heteroaryl containing 3-8C and at least one of N, O and S (optionally substituted by one or more of 1-6C alkyl and halo); Ar = 5-12C aryl (optionally substituted by one or more of 1-6C alkyl and halo); and Ar' = 5-24C aryl (optionally substituted by one or more of 1-6C alkyl and halo).
- -
-
-
- Reactivite du nitrite de sodium. II. Action sur les sels d'iminium heterocycliques. Etude par RMN multinucleaire
-
The structure and the electronic delocalisation of various heterocyclic iminium salts - and their precursors - have been studied by 13C and 15N NMR.The 13C and 15N chemical shifts are correlated with the nucleophilicity of the second heteroatom.The observation of δ13C explains satisfactorily the reactivity of heterocyclic iminium salts towards nucleophilic reagents and their catalytic activity as model compounds for thiamine or cocarboxylase.Different products are obtained by the reaction of sodium nitrite - in aqueous or non-aqueous medium - : they have been identified by NMR.The products are those expected and allow the determination of the reaction mechanisms.
- Gouesnard, Jean-Paul,Dorie, Jean
-
p. 253 - 258
(2007/10/02)
-
