Viscosity studies of certain alkyl phosphates and their aqueous mixtures

Abstract

sured system forms a closed curve between the upper and lower critical limits of solubility limited by the temperatures 27.9" and 830°C and by the concentrations 34.7 and 73.7 wt %,

Densities and Viscosities of Binary Mixtures of Tri-n-butyl Phosphate + Cyclohexane, + n-Heptane at T = (288.15, 293.15, 298.15, 303.15, and 308.15) K

“…TBP has a higher activation energy than cyclohexane and n -heptane. TBP is a liquid with self-association and H-bonding properties attributed mainly to dipole−dipole interactions. , The network of dipole−dipole forces P δ+ =O δ- binds the TBP molecules together. Extra energy is required to break this interaction.…”

“…The pycnometer filled with air bubble free experimental liquids was kept in a DF-02 transparent walled water bath (Fangao Scientific Co., Ltd., Nanjing, China) maintained constant to ( 0.01 K for more than 20 min to attain thermal equilibrium. The pycnometer was then removed from 18 3.770 3.8156 (292.88 K) 18 298.15 0.9725 0.97249 18 3.341 3.3440 18 0.9725 19 3.32 29 303.15 0.9682 0.96819 (303.17 K) 18 2.969 2.9726 (303.18 K) 18 0.968 13,15 2.97 13,15 308.15 0.9639 0.96388 (308.19 K) 18 2.651 2.6603 (308.19 K) 18 0.963 13,15 2.68 the water bath, properly dried, and weighed in the BS 224S analytical balance. Each reported density data was determined by averaging two to three measurements.…”