Y. V. L. Ravi Kumar

Quantitative structure-property relationships for normal saturated and unsaturated fatty acids

Quantitative structure-property relationships, a technique of deriving properties of compounds from knowledge of their structures, has been applied to aliphatic carboxylic acids, an industrially important group of compounds. Equations have been developed from the molecular connectivity of the first order and the molar refraction as inputs which, on testing with data of seven properties, yielded average absolute deviations ranging between 0.9 and 6.7%. The compounds studied ranged between C1 and C30 for saturated and C3 to C22 for unsaturated fatty acids. The properties studied are normal melting and boiling points, critical temperature and pressure, and heats of fusion, combustion and formation.

Isobaric Vapour-Liquid Equilibrium Data for the Binary Systems of Anisole with Benzene and Chlorobenzene

Isobaric VLE data were obtained for the binary systems of anisole with benzene and chlorobenzene over the entire composition range by an indirect method using a standard Swietoslawski-type ebulliometer at 3 different pressures. The experimental t-x data were correlated with Wilson & NRTL methods. Both these methods represent the data adequately.

Estimation of Solubility of Paraffins in Water by the Method of Neural Nets

Abstract Water solubilities of paraffins have been estimated by the method of artificial neural nets. The method, using the normal boiling point and temperature as the input parameters could estimate the solubilities of 151 paraffins at the temperatures of 298 K and 372 K with an overall deviation of 3.4%, yielding superior results over those obtained by least squares.

Bubble Temperature Data for Phenol-Alcohol Systems 1. Phenol-I-propanol System

Abstract Isobaric bubble temperature data were collected for the system phenol-i-propanol over the entire composition range by indirect method using a standard Swietoslawski type ebulliometer. The measurements were made at 209, 412 and 711 mm Hg. The experimental t-x data were correlated with both Gamma-Phi method and equation of state method. In the former approach, Wilson, NRTL and UNIQUAC equations are used whereas in the latter case Soave equation of state is used.

Activity coefficient and excess Gibbs free energies of allyl alcohol with trichloroethylene

Isobaric vapour-liquid equilibrium data have been measured for allyl alcohol and trichlorethylene at 200, 500 and 705 Torr for ten compositions spread evenly over the entire liquid mole fraction range, employing a Swietoslawski-type ebulliometer. The mole fraction composition vs. boiling point data are well represented by the Wilson model. The optimum Wilson parameters are used to calculate the vapour compositions, activity coefficients and the excess Gibbs free energy.

Isobaric Vapour Liquid Equilibrium Data for Binary Systems Phenol-Di-Isopropyl Ether and 2,4-Xylenol-Di-Isopropyl Ether

Abstract Motivated by chemical engineering design purposes, isobaric vapour liquid equilibrium data on two binary mixtures has been obtained. The temperature-mole fraction data were measured in a Swietoslawski ebulliometer.

A simple generalization of low-pressure viscosity of gases and mixtures

Abstract A simple generalized equation for the low-pressure viscosity of non-polar gases, η R = [4.875 T R (2 3) ] − 1.482, was developed. The equation was extended to polar gases and different types of mixtures and tested. The proposed equation is satisfactory for engineering design purposes, giving a percentage average absolute deviation of 7% for 61 pure substances and 8% for 45 binary mixtures.