Wyniki wyszukiwania - BazTech

1

Równowagi ciecz - ciecz w trójskładnikowych układach [BMIM][PF6] - alkohol - woda

Sokołowski A., Sawiński W., Polowczyk I., Koźlecki T., Ludwig W., Feder-Kubis J.

Inżynieria i Aparatura Chemiczna

|

2010

|

Nr 1

101-102

PL

Ciecze jonowe posiadają potencjalne zastosowanie w technikach separacyjnych. W niniejszej pracy badano zdolność heksafluorofosforanu 1-butylo-3-metyloimidazoliowego [BMIM][PF6] do rozdziału wodnych mieszanin metanolu, etanolu i propanolu. Eksperymentalnie uzyskano dane dla równowag ciecz-ciecz dla układów [BM1M][PF6] - alkohol - woda w temperaturze 298,15 K. Dane doświadczalne zostały w satysfakcjonujący sposób skorelowane za pomocą modelu NRTL.

EN

Ionic liquids have potential usability in separation techniques. In this work, ability of l-buthyl-3-methylimidazolium hexafluorophosphate [BMIM] [PFJ to separate methanol, ethanol and propanol from water was investigated. Liquid - liquid equilibrium data for [BMIM][PF6] - alcohol - water systems were measured at 298.15 K. The phase equilibrium data were satisfactorily correlated using the non-random two-liquid (NRTL) model.

2

Recent Developments in Thermodynamics of Mixtures Containing 1,3-Dialkylimidazolium Alkylsulfate Ionic Liquids

Domańska U.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 10

1923-1939

EN

Mixtures of ionic liquids, (ILs), with organic solvents exhibit a most interesting research area in thermodynamics. This report presents the ge eral discussion on the solid-liquid equilibria (SLE), high pressure solid-liquid equilibria, binary and ternary liquid-liquid equilibria (LLE), excess molar volumes, Vm E and ac tiv ity co ef fi cients at in finite dilution, gamma 1 Infinity of 1,3-dialkylimidazolium alkylsulfate ionic liquids, in alcohols and hydrocarbons. New sol u bil ity data of 1,3-dimethylimidazolium methylsulfate, [MMIM][CH3SO4] and 1-butyl-3-methylimidazolium octylsulfate, [BMIM][OcSO4] in methanol are presented. The solubilities have been measured by a dynamic method from 220 K to the melting point of the ionic liquid. Solubility of [MMIM][CH3SO4] and [BMIM][OcSO4] in methanol is very similar because of close melting temperatures of these ILs. The data were correlated by means of the NRTL and UNIQUAC equations utilizing parameters derived from the solid-liquid equilibrium. The melting point, the glass transition temperature and the enthalpy of fusion of [BMIM][OcSO4] were determined by the differential scanning calorimetry (DSC). The solubility of 1,3-dialkylimidazolium alkylsulfate ionic liquids in alcohols and hydrocarbons decreases with an in crease of the molecular weight of the solvent. Usually, with the exception of methanol and short chain alcohols, the mutual liquid-liquid equilibrium with the upper critical solution temperature (UCST) is observed in the liquid phase. This review presents a survey of the most recent data material including current developments and aspects of research activities needed in the future.

3

The Generalized NRTL Model Associated with the Peng-Robinson Equation of State to Predict Liquid-Liquid Equilibria Between Hydrocarbons,Water and Ethylene Glycol

Neau E., Nicolas C., Jaubert J., Mutelet F.

Polish Journal of Chemistry

|

2006

|

Vol. 80, nr 1

27-35

EN

In this study, the generalized NRTLmodel is combined with the Peng-Robinson equation of state in order to predict the liquid-liquid equilibrium of binary systems containing hydrocarbons, water and glycols. In the proposed model, the binary interaction parameters of theNRTLmodel are predicted bymeans of a group contributionmethod, while the volume and surface-area parameters of pure components introduced in the generalized NRTL version are estimated from the UNIFAC group contribution method. The results obtained in this paper are comparedwith those provided bywell knownmodels described in the literature.

4

Liquid-liquid Distribution of Selected Derivatives of Benzoic Acid in 1-Octanol-Toluene-Water Systems

Papciak B., Kopacz S.

Polish Journal of Chemistry

|

2006

|

Vol. 80, nr 9

1575-1582

EN

The influence of 1-octanol on liquid-liquid distribution of chloro and methoxy derivatives of benzoic acid in toluene-water systems was presented. The values of partition constant (Kp) and dimerization constant (Kd) of investigated acidswere calculated. It was found that raising of 1-octanol concentration in the mixture with toluene increases partition constants and decreases dimerization constants of the carboxylic acid.