Liquid Phase Equilibria Of Mixtures Research Articles

Liquid−Liquid Equilibria of Room-Temperature Ionic Liquids and Butan-1-ol

Room-temperature ionic liquids are salts that are liquid at room temperature. Their use as catalysts and catalytic support has been studied extensively. However, there are very few measurements on their solubility and phase equilibria in common organic solvents. In this work, the liquid−liquid phase equilibria of mixtures of room-temperature ionic liquids, 1-alkyl-3-methylimidazolium hexafluorophosphate, [Rnmim][PF6] (1) where Rn = butyl, pentyl, hexyl, heptyl, and octyl, with butan-1-ol (2) over a composition range have been measured. The binodal coexistence curves of the mixtures were found to have an upper critical solution temperature (USCT) at x2 ≈ 0.9. The UCST decreases with increase in the length of the alkyl chain of the ionic liquid, with the UCST of the butyl at 373 K and that of the octyl at 326 K. Both the UCST and the composition at the UCST as a function of the 1-alkyl group chain length can be reasonably well predicted from theory on the basis of unimolecular quantum chemical calculations.

Solid and liquid phase equilibria in mixtures of N, N-dimethylacetamide with chlorinated hydrocarbons

IN refs. [1,2], we studied the solid and liquid phase equilibria in mixtures of tetrachloromethane with oxygen and nitrogen-containing compounds, intermolecular interactionswith the formation of solid molecular addition compounds. The nitrogen atom linking withthree carbon atoms is a strong electron donor, so is N,N-dimethylacetamide (DMA). The...

Calculation of chemical potentials of mixtures from computer simulations

We report simulation results of chemical potentials on argon–krypton and nitrogen–ethane mixtures calculated by three methods, namely, the Widom test particle method, the difference method, and the ‘fA–fB’ method. The results showed that the ‘fA–fB’ method is best among the three methods for the calculation of chemical potentials at high densities, and capable of dealing with the liquid–liquid phase equilibria of mixtures.

Solid and liquid phase equilibria in mixtures of tetrachlorome-thane with oxygen-containing compounds

We have reported the solid and liquid phase diagrams for tetrachloromethane+cyclopentanone, +4-butyrolactone, and +1-methyl-2-pyrrolidinone.The solid compounds are formed in all the three systems. The second component in the three tetrachloromethane mixtures have cyclic structure. Ref. [2] pointed out that the cyclic structure of the second component is very important during the compound formation in the