Haike Yan
Academia Sinica
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Featured researches published by Haike Yan.
Thermochimica Acta | 1995
Yilin Wang; Buxing Han; Haike Yan; Ruilin Liu
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.
Journal of Solution Chemistry | 1995
Xiaoqing Qian; Buxing Han; Yun Liu; Haike Yan; Ruilin Liu
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.
Journal of Thermal Analysis and Calorimetry | 1998
Guoxing Gu; Wenqing Wang; Haike Yan
A calorimetric investigation was performed on the partition ofn-pentanol in the external oil phase and in the interfacial layer of the water-in-oil microemulsion system sodium dodecyl-benzenesulfonate(DDBS)/n-pentanol/n-heptane/water. The results show that fine changes can be observed in the structure of the water-in-oil emulsion and microemulsion droplets, such as then-pentanol/DDBS mole ratio increase in the interfacial layer; further, the alcohol/surfactant mole ratio α in the interfacial layer of the droplets, and also the standard thermodynamic functions of the alcohol transition from the external phase to the interfacial phase (ΔGe→so, ΔHc→so and ΔSe→so), can be derived from calorimetric data.
Fluid Phase Equilibria | 1998
Buxing Han; Guanying Yang; Jie Ke; Can Mao; Haike Yan
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.
Thermochimica Acta | 1994
Yilin Wang; Buxing Han; Haike Yan; Ruilin Liu
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.
Journal of Solution Chemistry | 1996
Peixun Li; Yilin Wang; Buxing Han; Haike Yan; Ruilin Liu
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.
Journal of Thermal Analysis and Calorimetry | 1995
Yang Zhao; Liang Zhao; Xing Wei; Buxing Han; Haike Yan
The enthalpies of solution of potassium chloride (KCl) in water and magnetically treated water (magnetized water) have been measured at 298.15 K using a LKB-8700 precision solution calorimeter. From the experimental results, it was observed that the effect of magnetic field on the enthalpy of solution is measurable. This is probably due to the distortion of the hydrogen bond of water resulting from magnetic treatment.ZusammenfassungMittels eines Präzisions-Lösungskalorimeters vom Typ LKB-8700 wurde bei 298.15 K die Enthalpie der Lösung von Kaliumchlorid (KCl) in Wasser und in magnetisch behandelten (magnetisiertem) Wasser gemessen. Anhand der experimentellen Ergebnisse wurde festgestellt, daß der Einfluß des magnetischen Feldes auf die Enthalpie der Lösung meßbar ist. Dies ist wahrscheinlich das Ergebnis der durch die magnetische Behandlung erfolgenden Störung der Wasserstoffbindung des Wassers.
Thermochimica Acta | 1991
Xu-Wu An; Haike Yan; Buxing Han; Da-Jun Guo; De-Yin Xie; Qi-He Zhu; Ri-Heng Hu
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.
Thermochimica Acta | 1992
Hong-Guo Liu; De-Qian Liu; Jian-Hua Zhang; Ben-Gao Jiang; Haike Yan
Abstract The coordination reactions of RE(ClO 4 ) 3 (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb or Lu) with dibenzo-30-crown-l0 (DB30C10) acetonitrile containing 0.5 vol.% water were investigated at 298.15 K by titration calorimetry. The formation constants and enthalpies of coordination adducts were calculated by using a program developed for use on an IBM computer. Furthermore, the formation free energies and entropies of the coordination adducts were obtained. The results show that adducts of 1:1 stoichiometry between each of the above 12 rare earth cations and DB30C10 are formed under the experimental conditions used, and all the formation enthalpies are negative.
Thermochimica Acta | 1991
Haike Yan; Bu-Xin Han; Lian Zhao; Yang Zhao; Lan Gao
Abstract The applications of thermodynamics and calorimetry in the petroleum industry are very extensive. This paper focuses on applications to oil recovery, and particularly to enhanced oil recovery. All work reported here has been done or is in progress in this laboratory. Results obtained are presented and discussed.