Paweł Gierycz

Vapour—liquid equilibria in binary systems formed by N-Methylpyrrolidone with hydrocarbons and hydroxyl derivatives

Abstract The vapour—liquid equilibria (VLE) determined by an ebulliometric total pressure method under isothermal conditions for binary systems formed by N -methylpyrrolidone with hexane (333.25 and 343.15 K), dodecane (393.25 K), cyclohexane (333.25 and 354.15 K), methyl-cyclohexane (354.15 and 373.25 K), benzene (333.25 and 354.15 K), toluene (362.15 and 383.35 K), propylbenzene (352.15 and 373.75 K), butylbenzene (352.15 and 373.75 K), propanol-1 (354.15 K), hexanol-1 (351.75 and 393.35 K) and at 393.55 K for cyclohexanol, 4-methylphenol and 2,4-dimethylphenol are reported. The vapour pressures of the pure substances are given. The least squares analysis of VLE data by means of the Redlich-Kister equation is given.

Vapour pressures and excess Gibbs energies of (butan-1-ol + n-octane or n-decane) at 373.15 and 383.15 K☆

Abstract The vapour pressures of (butan-1-ol + n -octane or n -decane) have been measured at 373.15 and 383.15 K using the ebulliometric method. Correlation of the experimental results by means of the NRTL and UNIQUAC equations leads to pressure residuals significantly exceeding experimental errors. The excess molar Gibbs energies G m E were calculated. Using these values the excess molar enthalpy H m E was calculated and compared with literature calorimetric values.

Vapour-liquid equilibrium and solid-liquid equilibrium in the system formed by 1-octanol and n-octane

Abstract The total vapour pressures of the binary system containing 1-octanol and n-octane were measured at 373.15 K and 383.15 K using the ebulliometric method. The solid-liquid equilibrium data were determined by the Rossini method. The experimental data were correlated by means of Redlich-Kister, NRTL and modified NRTL equations.

Excess enthalpy in the methanol-water system at 278.15, 298.15 and 323.15 K under pressures of 0.1, 20 and 39 MPa. II: Experimental results and their analytical presentation

Abstract Results are presented of flow-calorimetric measurements of excess enthalpy in the methanol-water system at temperatures 278.15, 298.15 and 323.15 K under pressures of 0.1, 20 and 39 MPa. The experimental results are correlated with the use of Redlich-Kister, NRTL and UNIQUAC formulas.

(Solid + liquid) equilibria in (n-octan-1-ol + n-hexadecane or n-dodecane or n-undecane)☆

Abstract The (solid + liquid) equilibria of (n-octan-1-ol + n-hexadecane or n-dodecane or n-undecane) have been measured using a dynamic method. The experimental results have been correlated using the NRTL and NRTLMK equations.

Vapour-liquid equilibrium and solid-solid equilibrium in the system formed by octan-1-ol and n-decane: measurement and calculation

Abstract The total vapour pressures of the binary system containing octan-1-ol and n -decane were measured at 373.15 K and 383.15 K using the ebulliometric method. The solid-liquid equilibrium (SLE) data were determined by the Rossini method. The experimental data were correlated using the Redlich-Kister, NRTL and modified NRTL equations. The prediction of SLE data from vapour-liquid equilibrium (VLE) and excess enthalpy H E data is proposed and discussed.

Thermodynamics of mixtures of N-methylpyrrolidone with hydrocarbons and their hydroxyl derivatives

Abstract The total pressure data for mixtures of N -methylpyrrolidone + hexane, +dodecane, + cyclohexane, + methylcyclohexane, + benzene, + toluene, + propylbenzene, +buthylbenzene, +propanol-1, +hexanol-1, + 4-methylphenol and + 2,4-dimethylphenol are correlated by means of NRTL and UNIQUAC equations. The NRTL equation is found to be more suitable for these systems. Modifications of NRTL equation making allowance for the solvation and association effects are proposed for accurate description of mixtures containing hydroxyl compounds. Better results are obtained with the model considering association only and so the modified NRTL equation is able to describe the excess Gibbs energy with the accuracy achieved in measurements. An attempt to obtain a consistent set of UNIFAC parameters for different mixtures containing N -methylpyrrolidone has given unsatisfactory results.

(Solid + liquid) equilibria in (butan-1-ol + n-decane or n-octane)☆

Abstract (Solid + liquid) equilibria have been studied for (butan-1-ol + n-decane or n-octane). The results have been successfully correlated with the NRTL and, with a slightly better fit, the NRTLMK equations.

Correlation and prediction of vapour-liquid equilibria in ternary systems formed by hydrocarbons

Abstract The problem of prediction and correlation of vapour-liquid equilibria (VLE) in ternary systems has been discussed and the limitation of the applicability of the known methods for this purpose has been pointed out. The investigations on the comparison of the efficiency of the various methods for the correlation and prediction of VLE in ternary systems belonging to different classes of mixtures have been undertaken. As a part of this work, the total pressure data for 4 ternary mixtures ( n -hexane-cyclohex-ane-benzene, n -hexane-methylcyclopentane-benzene, 1-heptene- n -heptane- n -octane and cyclohexane- n -heptane-toluene) and 12 appropriate binary mixtures ( n -hexane-cyclohexane, n -hexane-benzene, cyclohexane-benzene, n -hexane-methylcyclopentane, n -hexane-benzene, methylcyclopentane-benzene, 1-heptene- n -heptane, 1-heptene- n -octane, n -heptane- n -octane, cyclohexane- n -heptane, cyclohexane-toluene and n -heptane-toluene) have been selected and correlated by means of the NRTL, the UNIQUAC and the Wilson equations. Subsequently, the ternary VLE data have been predicted using the binary parameters of the equations calculated from appropriate binary VLE data. The correlation and the prediction results have been fully discussed from the point of view of intermolecular interactions and some recommendations for the use of the investigated equations for such calculations are made.

Description of binary systems containing hydrocarbons and alcohols by a modified NRTL equation

Abstract The total pressure data for binary mixtures containing hydrocarbons (n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-undecane) and n-alcohols (methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol) have been correlated by means of the NRTL equation and its modified [1] version making provisions for association. The correlation results much improve with the use of the modified equation, achieving the accuracy of representation of the excess Gibbs energy for all systems under investigation within the error limits of original experiment.