Buxing Han

Solubility of CH4 in the mixed solvent t-butyl alcohol and water

Abstract The solubility of CH 4 in water + t -butyl alcohol (TBA) mixtures has been measured at 283.15, 288.15, 293.15 and 298.15 K respectively and at pressures of up to 5 MPa. The solubility varies slowly with the composition of the solvent in the water-rich region and maxima and minima are observed in solubility versus solvent concentration curves at the lower temperatures. Anomalous behaviour of the solubility observed can be explained by the existence of a clathrate-like structure, which has been suggested by other authors. The standard thermodynamic functions are also closely related to the clathrate sturcture. The shapes of the solubility isotherms at different pressures are nearly the same, which shows that the dissolved gas and pressure do not significantly affect the structure of the solvent mixtures.

Vapor pressure of dimethyl sulfoxide and water binary system

The total vapor pressures of dimethyl sulfoxide (DMSO) and water mixtures have been measured at 15, 20, 25 and 30°C. The activity coefficients and molar excess Gibbs energies of the system have been calculated. Possible association interaction in the system are discussed.

Phase equilibria of supercritical propane–Fengcheng bitumen system and the density and viscosity of the liquid phase

Abstract Vapour–liquid equilibria of supercritical propane–Fengcheng bitumen system have been determined at 381.15 K, 388.15 K, and 398.15 K and at pressures ranging from 4.4 to 8.6 MPa. The densities of the two phases, the viscosity of the liquid phase, and the average molecular weight of the extracted bitumen components were also determined.

Vapour pressures of binary mixtures of t-butyl alcohol and water

Abstract The total vapour pressures of t -butyl alcohol (TBA) and water mixtures have been measured at 283.15, 288.15, 293.15, 298.15 and 303.15 K, respectively. Maxima and minima were observed in the vapour pressure versus concentration curves at the three lowest temperatures. The anomalous behaviour of the solution can be explained by the existence of a clathrate-like structure, which has been suggested by other authors.

Solubility of ethane int-butanol + water mixtures and a hydrophobic interaction study

The solubilities of ethane int-butanol (TBA) and water mixtures have been determined at 10, 15, and 20°C and pressures up to 3.1 MPa. Thermodynamic properties have also been calculated based on the measured solubility data and the hydrophobic interaction for the methane-methane pair interaction in the mixed solvent is discussed.

Calorimetric investigation of electrochemically induced nuclear fusion of deuterium

Abstract Two similar calorimeters electrically connected in series, one for heavy water and the other for ordinary water for comparison, were used in the investigation of their excess heating rates. The production of neutrons, γ-rays, tritium and helium was not investigated in our laboratory. Cathodes for the two calorimeters were made from palladium rods 5.9 mm in diameter and 47 mm in length. They were treated in molten NaOH at 600°C for 1 h to activate their surfaces. Platinum gauze (0.5 mm wire) anodes were used in both calorimeters. For electrolysis, a current of 0.600 A was first maintained for 96 h and was then increased to 0.800 A, 1.000 A and 1.300 A for additional periods of 13 h, 16.5 h and 21 h respectively. A separate measurement with a current of 1.300 A without stirring for 72 h was also made. No evidence of nuclear fusion of deuterium was found in this investigation, which was carried out from 14 April to 16 May, 1989.