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Your search keyword '"Hofman, Tadeusz"' showing total 109 results
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109 results on '"Hofman, Tadeusz"'

1. Solid-liquid equilibria and excess enthalpies in binary mixtures of propiophenone with some aliphatic amides

Author

Sikorski, Patryk, Cobos, Ana, González, Juan Antonio, Królikowski, Marek, and Hofman, Tadeusz

Subjects
Physics - Chemical Physics, Physics - Applied Physics
Abstract

The solid-liquid equilibria and excess enthalpies of the binary systems of propiophenone and {N-methylformamide, or N,N-dimethylformamide, or N,N-dimethylacetamide, or N-methyl-2-pyrrolidone} were measured. The SLE datawere determined by the cloud-point method, partly supplemented by the DSC technique. The excess enthalpieswere measured by the titration calorimetry at 298.15 K and 308.15 K for all the systems and additionally at 293.15 K and 318.15 K for the system with N-methylformamide, and at 293.15 K for the system with N,N-dimethylformamide. The activity coefficients of both components as a function of concentration and temperature were calculated by the correlation which included both types of data. The results of the prediction by the modified UNIFAC model were comparedwith the experimental data. The observed trends and differences between the systems were discussed., Comment: 8 tables, 9 figures

Published
2024
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2. Solid-liquid equilibria and excess enthalpies in binary mixtures of acetophenone with some aliphatic amides

Author

Cobos, Ana, Sikorski, Patryk, González, Juan Antonio, Królikowski, Marek, and Hofman, Tadeusz

Subjects
Physics - Chemical Physics, Physics - Applied Physics
Abstract

Solid-liquid equilibria for the binary systems of acetophenone and {N-methylformamide, or N,Ndimethylformamide, or N,N-dimethylacetamide, or N-methyl-2-pyrrolidone} were determined by the cloudpoint and DSC techniques. For the same systems, excess enthalpies were measured at 293.15 K and 308.15 K by the titration calorimetry. Both types of data were correlated by the Redlich-Kister equation. The description of the solid-liquid equilibria incorporated measured excess enthalpies. The results of the prediction performed by the modified UNIFAC modelwere compared with the experimental data. The observed trends and differences between systems were discussed., Comment: 8 tables, 8 figures

Published
2024
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25. Prediction of thermodynamic properties of the systems formed by n-alkanes, aliphatic monoethers, and I-Chloralkanes using a cell-hole group contribution model

Author

Hofman,Tadeusz

Subjects
Chemistry, Physical and theoretical -- Research, Alkanes -- Properties, Alkanes -- Research, Thermodynamics -- Research, Chemicals, plastics and rubber industries
Abstract

A detailed test of the group-contribution hole models is used to predict thermodynamic properties of pure n-alkanes aliphatic monoethanes, 1-Chloroalkanes and their mixtures with n-alkane. The model however, in spite of being universal is applicable only to a few properties and limited range of parameters.

Published
2004

48. Liquid–liquid equilibrium in binary systems of isomeric C8 aliphatic monoethers with nitromethane.

Author

Hofman, Tadeusz, Reda, Mateusz, and Gliński, Marek

Subjects
*LIQUID-liquid equilibrium, *SOLID-liquid equilibrium, *BINARY mixtures, *ETHERS, *NITROMETHANE, *SOLUBILITY, *ISOMERS
Abstract

Highlights: [•] New apparatus measuring liquid–liquid and solid–liquid-equilibria was constructed. [•] LLE data for isomeric C8 aliphatic ethers and nitromethane were measured. [•] Influence of the position of ether group on the solubility curve was discussed. [ABSTRACT FROM AUTHOR]

Published
2013
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49. Volumetric Properties of the { x[Cmim][MeSO] + (1 − x)MeOH} System at Temperatures from (283.15 to 333.15) K and Pressures from (0.1 to 35) MPa.

Author

Matkowska, Dobrochna and Hofman, Tadeusz

Subjects
VOLUMETRIC analysis, TEMPERATURE effect, METHANOL, IONIC liquids, SYSTEMS theory, LINEAR free energy relationship
Abstract

Densities of pure 1-butyl-3-methylimidazolium methylsulfate, [Cmim][MeSO], and its mixtures with methanol have been measured. Measurements were made with an accuracy of ±0.2 kg·m, using a vibrating-tube densimeter, over the temperature and pressure ranges (283.15-333.15) K and (0.1-35) MPa, respectively. The experimental densities for the pure ionic liquid and alcohol have been correlated by the Tait equation. The results for the { x[Cmim][MeSO] + (1 − x)MeOH} system have been correlated by a van Laar equation involving parameters that are dependent on temperature and pressure. Excess volumes have been obtained directly from the experimental densities, while isobaric expansivities, isothermal compressibilities, and related excess properties were calculated from the correlation equation. Exceptionally strong pressure and temperature influences on these properties were observed. [ABSTRACT FROM AUTHOR]

Published
2013
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50. Volumetric properties of the ionic liquids: [C6mim][MeSO4], [C6mim][EtSO4], [C4mim][EtSO4] and their mixtures with methanol or ethanol

Author

Matkowska, Dobrochna and Hofman, Tadeusz

Subjects
*VOLUMETRIC analysis, *IONIC liquids, *METHANOL, *ETHANOL, *DENSITY, *IMIDAZOLES, *TEMPERATURE effect
Abstract

Abstract: Densities of pure ionic liquids, 1-hexyl-3-methylimidazolium methylsulfate [C6mim][MeSO4], 1-hexyl-3-methylimidazolium ethylsulfate, [C6mim][EtSO4], 1-butyl-3-methylimidazolium ethylsulfate [C4mim][EtSO4] and their mixtures with either methanol or ethanol, were measured at temperatures T/K=(283.15, 298.15, 313.15, 328.15) at ambient pressure. The excess volumes V E were correlated by the van Laar equation with the temperature-dependent parameters. Isobaric expansivity and excess isobaric expansivity were described as functions of temperature and composition. The negative deviations from ideal mixing were observed for excess volume V E and the excess isobaric expansivity α E. [Copyright &y& Elsevier]

Published
2013
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