Excess thermodynamic properties of binary mixtures of n-Alkanes with cycloalkanones

Mahl, B.S.; Kaur, H.

doi:10.1016/0040-6031(87)88292-8

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…The mixing of THF with cyclic ketones is endothermic, but H E values are small, revealing again a significant heteroassociation. The excess enthalpies obtained for equimolar mixtures of cyclic ketones with heptane 31 suggest that cohesion forces are stronger in pure cyclopentanone (1256 J‚mol -1 ) than in pure cyclohexanone (1139 J‚mol -1 ). Acting in the opposite sense, unlike-pair interactions are favored by the similarity between the cycle sizes of THF and cyclopentanone.…”

Section: Resultsmentioning

confidence: 95%

Thermodynamics of Mixtures Involving Some Linear or Cyclic Ketones and Cyclic Ethers. 1. Systems Containing Tetrahydrofuran

Brocos¹,

Piñeiro²,

Bravo³

et al. 2002

J. Chem. Eng. Data

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Densities F, refractive indices n, and volumetric heat capacities C p /V have been measured at 298.15 K over the whole concentration range for the binary mixtures {tetrahydrofuran + 2-pentanone, + 2-heptanone, or + cyclopentanone}. From experimental data excess molar volumes V E , excess molar refractions R E , and excess molar isobaric heat capacities C p E were calculated. Excess molar enthalpies H E have been measured at the same temperature for the systems {tetrahydrofuran + 2-pentanone, + 2-heptanone, + cyclopentanone, or + cyclohexanone}. These quantities are discussed in terms of the nature of intermolecular interactions and in terms of the influence of the shape and size of the ketone. The ratio of molar volume to molar refraction V/R allows n, V, and C p data to be analyzed in a comprehensive form.

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Section: Resultsmentioning

confidence: 95%

Thermodynamics of Mixtures Involving Some Linear or Cyclic Ketones and Cyclic Ethers. 1. Systems Containing Tetrahydrofuran

Brocos¹,

Piñeiro²,

Bravo³

et al. 2002

J. Chem. Eng. Data

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“…35,38 For example, cyclohexanone or cylcopentanone have positive V E throughout the entire concentration range in long chain alkane solvents. 39 However, low carbon number alkane solvents, such as hexane, either show negative V E or change sign as the mole fraction changes. This is due to different packing arrangements in the solvent or solvent reorganization.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore V E is positive when these hydrogen bonders are diluted with fairly large n -alkanes. However, when the components differ in their physical makeup, or small inert diluents are used, more complex behavior in V E is often observed. , For example, cyclohexanone or cylcopentanone have positive V E throughout the entire concentration range in long chain alkane solvents . However, low carbon number alkane solvents, such as hexane, either show negative V E or change sign as the mole fraction changes.…”

Section: Resultsmentioning

confidence: 99%

The Nature of the Binary Solvent N-Methylpyrrolidone/Carbon Disulfide

Dyrkacz

2001

Energy Fuels

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The solvent properties of the binary solvent carbon disulfide/N-methylpyrrolidone (NMP) have been investigated using density, viscosity, solvatochromic, and FTIR measurements. The excess molar volumes were negative throughout the entire range of CS2/NMP ratios suggesting complex formation or preferred solvent structures at intermediate ratios of the solvents. The viscosity measurements suggested either complex formation between CS2 and NMP or very complex self-association equilibria. FTIR data did not support the idea of specific interactions between CS2 and NMP, but did show that complex changes in self-association were occurring. The solvatochromic studies indicated that at approximately a 1:1 volume ratio, the dipolar state of the binary solvents was greater than for either solvent separately. All the information together suggested that some type of NMP chain oligomer may be an important factor in understanding the synergistic extraction of coal in CS2/NMP solvent.

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“…Page 10 of 40 cycloalkanone systems. In this framework, the negative E m V value of the cyclohexanone + n-C 6 mixture (-0.323 cm3 •mol -1[53]) remarks the existence of strong structural effects in such a solution, as the corresponding E m H value is positive[57].…”

mentioning

confidence: 86%

Orientational effects in alkanone, alkanal or dialkyl carbonate + alkane mixtures and in alkanone + alkanone or + dialkyl carbonate systems

Hevia

González

Alonso-Tristán

et al. 2017

Journal of Molecular Liquids

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Interactions and structure of alkanone, or alkanal or dialkyl carbonate + alkane mixtures, or of 2-alkanone+ 2-alkanone, or of ketone + dialkyl carbonate systems have been investigated by means of a set of thermodynamic properties and by the application of the Flory model. The properties considered are excess molar quantities: enthalpies, E m H , volumes, E m V , or isobaric heat capacities, E pm C , and liquid-liquid equilibria. Experimental data show that alkane mixtures are characterized by rather strong dipolar interactions. In the case of systems containing ketones with the same number of C atoms and a given alkane, dipolar interactions become weaker in the sequence: aromatic > cyclic > linear. In addition, the mentioned interactions become also weaker in the order: dialkyl carbonate > linear alkanone > linear alkanal. This is an important result, as carbonates show lower effective dipole moments than the other compounds, and it suggests that the group size may be relevant when evaluating thermodynamic properties of liquid mixtures. Results on E m H from the Flory model show that orientational effects (i.e., nonrandom mixing) are rather similar for systems with linear, cyclic or aromatic ketones or alkanals and alkanes. In contrast, orientational effects become weaker in dialkyl carbonate + alkane mixtures. The behaviour of 2-alkanone + 2-akanone systems and of mixtures of longer 2alkanones or cyclohexanone with dialkyl carbonate is close to random mixing. Larger orientational effects are encountered in solutions of carbonates and shorter 2-alkanones.

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Excess thermodynamic properties of binary mixtures of n-Alkanes with cycloalkanones

Cited by 9 publications

References 9 publications

Thermodynamics of Mixtures Involving Some Linear or Cyclic Ketones and Cyclic Ethers. 1. Systems Containing Tetrahydrofuran

Thermodynamics of Mixtures Involving Some Linear or Cyclic Ketones and Cyclic Ethers. 1. Systems Containing Tetrahydrofuran

The Nature of the Binary Solvent N-Methylpyrrolidone/Carbon Disulfide

Orientational effects in alkanone, alkanal or dialkyl carbonate + alkane mixtures and in alkanone + alkanone or + dialkyl carbonate systems

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