K. Venkateswara Rao

Vapor-liquid equilibria of 2-propanol-1,4-dioxane mixtures

Abstract Eight sets of experimental P – T – x data were determined for 2-propanol–1,4-dioxane mixtures using an ebulliometer. Five popular activity coefficient models and a coexistence equation have been used to correlate each set of data through different optimization methods to obtain values of the vapor phase compositions and excess Gibbs free energy. The results of these correlations have been compared. An attempt was made to evaluate the group interaction parameters for alcohol-1,4-dioxane mixtures to improve VLE predictions using the UNIFAC method.

Measurement, correlation and estimation of binary vapor—liquid equilibria for alcohol—chlorobenzene systems

Abstract Experimental VLE of chlorobenzene—1-pentanol binary mixtures are determined at 101.08 kPa. Also, the activity coefficients at infinite dilution (γ ∞ ) for some alcohol—chlorobenzene systems are determined from ebulliometric measurements. The Wilson equation is tested for 10 binary alcohol—chlorobenzene systems. The results show that this model represents the data well. There is good comparison between experimental γ ∞, s and γ ∞, s computed from Wilson parameters. Further, the VLE data for the above-mentioned mixtures are estimated by the UNIFAC method.

Vapor—liquid equilibria of some n-alcohol—tetrachloroethene systems

Abstract Vapor—liquid equilibrium data for binary systems of three n -alcohols with tetrachloroethene are reported at 760 mmHg pressure. Butlers and Wehe and Coates correlations for calculating the limiting activity coefficients have been extended to the systems studied. The latter correlation is found to be valid for n -alcohols as well as iso-alcohols.

Phase equilibrium data needs of fine chemical and pharmaceutical industry

Abstract The phase equilibrium data needs of fine chemical and pharmaceutical industry are emphasized with illustrations from chemical synthesis of vitamin B 1 and in manufacture of lactic acid by fermentation. The constants in the AMP equation for calculation of vapor pressures of the compounds, β-ethoxy proprionitrile, acetobutyrolactone, chloroacetobutyro lactone, 4-methyl 5-hydroxy ethyl thiazole and acetyl acetone are presented. The applicability of UNIFAC method to the binary vapor liquid equilibria of ethyl acetate-acetyl acetone and isopropanol-acetyl acetone which find application in the manufacture of sulfa drugs is shown.