Xianshu Qiao

Density, viscosity and excess properties for the binary system 2-butoxy ethanol + water at T = (298.15–318.15) K and mixture’s spectroscopic studies

ABSTRACT This report presents the density and viscosity data of binary system 2-butoxy ethanol (BOE) + water (H2O) over the entire composition range at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K. On the basis of density and viscosity values, the excess molar volumes (), viscosity deviations (∆ν) and excess Gibbs free energies of activation (ΔG*E) were calculated. The computed results were fitted with the Redlich–Kister equation to derive the coefficients and estimate the standard deviations between the experimental and calculated values. The values of were negative, whereas the values of ∆ν were positive over the entire composition range. On the basis of the kinematic viscosity data, enthalpies, entropies and Gibbs energies of activation for the viscous flow were also calculated. Moreover, the intermolecular interaction of BOE with H2O was discussed on the basis of UV-Vis and FTIR spectral data.

Physicochemical properties and spectral studies of the 1,3-butanediol + dimethyl sulfoxide binary system at T = (293.15–318.15) K

ABSTRACT This work reports experimental dynamic viscosity (η) and density (ρ) for 1,3-butanediol (BTD) (1) and dimethyl sulfoxide (DMSO) (2) binary systems at T = (273.15–318.15) K and p = 0.1 MPa. From the experimental ρ and η data, the excess molar volumes () values, viscosity deviation (∆η) values, partial molar volumes ( and ) values, apparent molar volume (Vφ,1 and Vφ,2) values, excess free energies of activation () values and isobaric thermal expansion coefficient (αp) values were, respectively, obtained. After that, a Redlich–Kister equation was used to fit , ∆η and values. The mixtures exhibited positive with a maximum at x1 = 0.55, which became more pronounced after temperature increased. The obtained standard deviations (σ) values were compared with literature data and conclusion about application modus was drawn. From FTIR, UV–vis, FTIR and NMR spectral information, intermolecular interaction between BTD and DMSO was systemically explored.

Absorption, desorption and interaction of SO2 with the binary system tetraethylene glycol + dimethyl sulfoxide

ABSTRACT The gas-liquid equilibrium (GLE) data were determined for the mixture SO2 + N2 in the binary system of tetraethylene glycol (TeEG) + dimethyl sulfoxide (DMSO) at T = 298.15–313.15 K and p = 123.15 kPa with the SO2 partial pressures of 0.4–150 Pa. From GLE data, Henry’s law constants (HLCs) were obtained. When the SO2 concentration in the gas phase was designed at ySO2 = 500 ppmv, the SO2 solubility in the binary system is located in a minimum of 9.36 mol m−3 in TeEG and a maximum of 80.34 mol m−3 in DMSO. The SO2 absorption process was reversible from the five absorption–desorption cycles, and the solvents could repeat utilisation without obvious loss of absorption capacity and the homologous SO2 desorption efficiency was nearby 98.7%. Furthermore, the spectral consequences illustrated that H-bonding was formed among TeEG, DMSO and SO2.

Controllable synthesis of nanostructured BaSO4 and BaSO3 crystals on the basis of DMSO oxidation chemistry

A simple and novel SO2 release method for the synthesis of controllable nanostructured BaSO4 and BaSO3 crystals was developed based on the oxidation of HSO3− to SO42− by dimethyl sulfoxide (DMSO) in a binary system of triethylene glycol (TEG) + DMSO. The binary system was successfully re-used for SO2 absorption and production of BaSO3 crystals at least three times. Aggregation and self-assembly mechanisms for the preparation of BaSO4 and BaSO3 crystals were proposed. This controllable synthesis strategy for BaSO4 and BaSO3 crystals has offered an alternative way for the comprehensive utilization of SO2, and provided a scientific foundation for the development of DMSO oxidation chemistry.

A novel SO2 capture, storage and utilisation to prepare BaSO3 micro-particles

Abstract A highly efficient SO2 capture system was developed. The system consisted of equimolar ethanediamine (EDA) and ethylene glycol (EG), and could chemically transform SO2 into a novel solid material, denoted as SO2SM, under mild condition. This system showed a considerable SO2 storage capacity up to 0.7696 g/g (EDA + EG). Furthermore, the aqueous solution of SO2SM was used to prepare BaSO3 micro-particles. During the reaction, EDA and EG were released from the SO2SM and served as a directing agent and dispersant in making BaSO3 crystals that had a porous structure. Thus, the combined process enabled the comprehensive utilisation of SO2 and could convert SO2 into a value-added chemical.