Yansheng Liu

Desulfurization of Diesel Fuel by Extraction with [BF4]−-based Ionic Liquids

Abstract The extractive removal of sulfur compounds (S-compounds) from Dongying and Liaohe diesel fuels with [BF4]−-based ionic liquids were systematically investigated. The results show that the absorption capacity of an ionic liquid for the S-compounds in diesel fuels relies on its structure and its size. In the case of the two examined diesel fuels, both elongating the cation tail length and increasing the mass ratio of ionic liquid/diesel fuel promote the desulfurization ability of the examined ionic liquids. The results also show that imidazolium-based ionic liquids display higher extraction efficiencies than pyridinium-based ionic liquids, presumably owing to the fact that the rings of the S-compounds are similar to the imidazolium head ring. With the 1 : 1 mass ratio of ionic liquid/diesel fuel, the rates of the first desulfurization of Dongying and Liaohe diesel fuels using [C8mim][BF4] amount to 29.96% and 39.76%, suggesting that [C8mim][BF4] is a promising extractant for desulfurization of these diesel fuels.

Separation of ionic liquids from dilute aqueous solutions using the method based on CO2 hydrates

Abstract Ionic liquids (ILs) have been regarded as the potential novel solvents for improved analytical- and process-scale separation methods. The development of methods for the recovery of ILs from aqueous solutions to escape contamination and recycle samples will ultimately govern the viability of ILs in the future industrial applications. Therefore, in this paper a new method for separation of ILs from their dilute aqueous solutions and simultaneously purification of water was proposed on the basis of the CO2 hydrate formation. For illustration, the dilute aqueous solutions with concentrations of ILs ranging from 2 × 10−3 mol% to 2 × 10−1 mol% were concentrated. The results show that the separation efficiency is very impressive and that the new method is applicable to aqueous solutions of both hydrophobic and hydrophilic ILs. Compared to the literature separation method based on the supercritical CO2, the new method is applicable to lower concentrations, and more importantly, its operation condition is mild.

Effect of 1-butyl-3-methylimidazolium tetrafluoroborate on the formation rate of CO2 hydrate

Abstract The effect of the addition of 1-butyl-3-methylimidazolium tetrafluoroborate ([C 4 mim][BF 4 ]) on the formation rates of CO 2 hydrates was investigate. The isothermal and isobaric methods were used to measure the formation rates of CO 2 hydrates. As compared to those of pure water, the data of phase equilibrium changed greatly. The effects of pressure, temperature, and the concentration of [C 4 mim][BF 4 ] aqueous solution on the formation rates of CO 2 hydrates were investigated. With a constant concentration of [C 4 mim][BF 4 ], the rate of gas consumption was enhanced with the lowering of experimental temperature. However, a decrease in pressure exerted an opposite effect on the rate of gas consumption. Moreover, the addition of [C 4 mim][BF 4 ] raised the equilibrium pressure of hydrate formation at the same temperature.

Densities and Viscosities of the Quaternary System Mannitol-Sorbitol-D-Glucose-H2O and Its Ternary Subsystems at 298.15K*

Abstract To check the applicabilities of the simple density equation and viscosity equation in the semi-ideal solution theory to nonelectrolyte solutions, the densities and viscosities were measured for the quaternary system mannitol-sorbitol-D-glucose-H 2 O and its ternary subsystems mannitol-D-glucose-H 2 O and sorbitol-D-glucose-H 2 O at 298.15K. The results were used to test the applicability of the simple equations for the density and viscosity of the multicomponent nonelectrolyte solution. The agreements between the predicted and measured results are good.

Effect of Ionic Liquids on Organic Reactions Based on Activity Coefficients at Infinite Dilution

Abstract It is important to know how ILs (ionic liquids) influence organic reaction. In this paper, activity coefficients at infinite dilution of more than 80 organic compounds in ILs are collected and analyzed systematically. Through the study on typical organic reactions happened in ILs, such as Diels-Alder, esterification and Friedel-Crafts reaction, the ratio of activity coefficients at infinite dilution of products and reactants is employed to estimate different effects of different structural ILs on the rate and selectivity of reactions.