P. R. Naidu

Excess thermodynamic properties of liquid (ethylenediamine + an aromatic hydrocarbon)

Abstract Excess volumes and deviations in isentropic compressibility for liquid ethylenediamine + benzene, + toluene, + o -xylene, + m -xylene, and + p -xylene were measured at 303.15 K over the entire composition range. V E is positive over the entire mole-fraction range in all the mixtures. Deviations in isentropic compressibility, were computed assuming the compressibility to be additive in terms of volume fraction, were negative for ethylenediamine + benezene and + toluene and positive for ethylenediamine + an isomeric xylene.

Excess volumes of n-butylamine + an aliphatic ketone at 303.15 K

Abstract Excess volumes of methyl ethyl ketone +, methyl n -propyl ketone +, and diethyl ketone + n -butylamine were measured at 303.15 K. These mixtures have negative values of V E with minima occurring from 0.4 to 0.6 mole fraction of n -butylamine. The results suggest that hydrogen-bond interaction between unlike molecules dominates in the mixtures.

Thermodynamic properties of binary liquid mixtures involving weak interactions Part 1. Excess volumes of binary mixtures of 1-chlorobutane with normal alkanols at 303.15 K

Abstract Chandramouli, J., Choudary, N.V., Krishnaiah, A. and Naidu, P.R., 1982. Thermodynamic properties of binary liquid mixtures involving weak interactions. Part 1. Excess volumes of binary mixtures of 1-chlorobutane with normal alkanols at 303.15 K. Fluid Phase Equilibria , 8: 87–92 Excess volumes for binary mixtures of 1-chlorobutane with 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol have been determined at 303.15 K. V E is positive over the whole range of composition for the mixtures of 1-chlorobutane with 1-propanol and 1-butanol. An inversion in the sign of V E is observed over certain ranges of concentration of the halogenated alkane in the remaining four mixtures. The results are explained in terms of depolymerisation of hydrogen-bonded alcohol aggregates, decrease in dipolar association, and weak hydrogen-bonding interaction of the type Cl- - - HO between unlike molecules.

Isentropic compressibilities of n-butylamine + methyl ethyl ketone, + methyl n-propyl ketone, and + diethyl ketone at 303.15 and 313.15 K

Isentropic compressibilities κs of n-butylamine + methyl ethyl ketone, + methyl n-propyl ketone, and + diethyl ketone were measured at 303.15 and 313.15 K. The mixtures exhibit negative deviations in κs. The negative deviation indicates that hydrogen-bond interaction between unlike molecules dominates in the mixtures. Further, the negative deviation decreases with increase in temperature.

Viscosities of binary mixtures containing one polar component

Viscosities of binary mixtures, benzene + benzonitrile, benzene + methylpropylketone and cyclohexane + methylpropylketone were determined at 303·15 K. The experimental results were analysed in the light of Bloomfleld and Dewan’s theory. The analysis showed that the theory correctly predicts the sign of viscosity function in the case of benzene + benzonitrile and cyclohexane + methylpropylketone.

Excess volumes and isentropic compressibilities of binary mixtures of di-n-butylamine with iso-alkanols at 303.15 K

Volumes of mixing and deviations in isentropic compressibility for binary mixtures of di-n-butylamine with iso-propanol, iso-butanol and iso-pentanol were measured at 303.15 K. The excess volumes and deviations in isentropic compressibility are negative over the entire range of mole fractions in all the systems. The results point out that there is a strong H-bond interaction between unlike molecules

Isentropic compressibilities of ternary systems with 1-alkanol as non-common component

New isentropic compressibility data are reported for four ternary mixtures, which contained methylethylketone andn-octane as common components. 1-propanol, 1-butanol, 1-pentanol and 1-hexanol, which form a homologous series, were used as non-common components. The deviation in isentropic compressibility has been computed from the experimental results and compressibility of ideal mixtures. The deviation is positive over the whole range of volume fraction in the fourt mixtures. The positive deviation suggests that the structure breaking effect of the components outweighs the structure making effect.