The thermodynamics of mixing C6 and C7 compounds with a bicyclic compound at infinite dilution

The activity coefficients at infinite dilution have been measured at 25°C for cyclohexane, cyclohexene, 1,3-cyclohexadiene, 1,4-cyclohexadiene, benzene, n-hexane, 1-hexene, 1-hexyne, n-heptane, 1-heptene and 1-heptyne in decahydronaphthalene, bicyclohexyl, 1,2,3,4-tetrahydronaphthalene and cyclohexylbenzene. These results, together with previously determined H _m ^E and V _m ^E have been used to calculate the partial molar excess thermodynamic properties of mixing at infinite dilution.     

Application of the Prigogine-Flory-Patterson theory part III. Mixtures of a bicyclic compound,benzene, cyclohexane,n-hexane with a cycloalkane,cyclohexene, a cycloalkadiene and benzene

The Prigogine-Flory-Patterson theory of liquid mixtures has been qpplied to the H _m ^E and V _m ^E for binary mixtures of a bicyclic compound, benzene, cyclohexane and n-hexane with a cycloalkane, cyclohexene, a cycloalkadiene and benzene. Furthermore the Prigogine-Flory theory has been used to predict activity coefficients at infinite dilution from the experimentally determined H _m ^E at 25°C for the mixtures cyclohexane, cyclohexene, 1,3-cyclohexadiene, 1,4-cyclohexadiene and benzene with a bicyclic compound. The predictions are compared to experimental results.     

Excess volumes and enthalpies of mixing benzene with various bicyclic compounds

The V _m ^E and H _m ^E for solutions of benzene in decahydronaphthalene, in bicyclohexyl, in cyclohexylbezene and in 1,2,3,4-tetrahydronaphthalene have been measured over the complete composition range at 25°C. The results have been fitted to the Flory theory of liquid mixtures.     

Application of the Prigogine-Flory-Patterson theory part II. Mixtures of a bicyclic compound,benzene, cyclohexane,n-hexane with a 1-alkene and a 1-alkyne

The Prigogine-Flory-Patterson theory of liquid mixtures has been applied to the H _m ^E and V _m ^E for binary mixtures of an n-alkane with decalin, bicyclohexyl, tetralin, cyclohexylbenzene, benzene, cyclohexane and n-hexane with 1-hexene, 1-hexyne, 1-heptene and 1-heptyne. Furthermore the Prigogine-Flory theory has been used to predict activity coefficients at infinite dilution from the experimentally determined H _m ^E at 25°C for the mixtures 1-hexene, 1-hexyne, 1-heptene, 1-heptyne with decalin, bicyclohexyl, tetralin and cyclohexylbenzene. The predictions are compared to experimental results.     

Short-Range Ordering in Liquid Bicyclohexyl by X-Ray Diffraction

Abstract

The paper reports results of the X-ray diffraction structural studies of liquid bicyclohexyl, C₆H₁₁—C₆H₁₁ at room temperature, using CuK _α radiation. Angular distribution of X-ray scattered intensity was measured, and the electron-density radial-distribution function was calculated. Computer techniques were used to minimize the effects of experimental errors, uncertainties in the scattering factors, and termination errors. Good agreement between the theoretical and experimental functions was obtained on assuming the statistically most probable model of this molecule. The structural data obtainable by X-ray analysis for liquid bicyclohexyl were discussed. The mean distances between the neighbouring molecules and the radii of coordination spheres were found. The maxima in the differential radial distribution function were at: r ₁ = 4.68, r ₂ = 5.57, r ₃ = 6.62, r ₄ = 8.05 Å. X-ray structural analysis was applied to determine the packing coefficient of bicyclohexyl molecules. A simple model of short-range arrangement of the molecules in liquid bicyclohexyl was proposed.     

Retention of some phenyl-substituted and bicyclic hydrocarbons on graphitized carbon black

Summary Retention volume values for zero cample size (Henry's constants) at different temperatures, retention indices and differential adsorption heats of phenylethylene, phenylacetylene, C₉–C₁₂ phenylcyclanes, biphenylethylenes, biphenylacetylene, bicyclohexyl and bicyclohexylmethane have been determined on graphitized thermal carbon black (GTCB). The molecules of all these hydrocarbons are capable of internal rotation. The values of the thermodynamic adsorption characteristics of phenylcyclanes increase with increasing number of carbon atoms in the cycle. Bicyclohexyl is retained on GTCB considerably weaker than biphenyl while bicyclohexylmethane is retained stronger than biphenylmethane. Symmetric and nonsymmetric biphenylethylenes are retained much stronger than the corresponding biphenylethanes. Phenylethylene (styrene) and trans-biphenylethylene (trans-stilbene) are stronger retained on GTCB than phenylacetylene and biphenylacetylene (tolane), respectively. The relationship between the structure of these molecules and their retention on GTCB is discussed.     

Application of the Prigogine-Flory-Patterson theory part I. Mixtures ofn-alkanes with bicyclic compounds,benzene, cyclohexane andn-hexane

The Prigogine-Flory-Patterson theory of liquid mixtures has been applied to the H _m ^E and V _m ^E for binary mixtures of an n-alkane with decalin, bicyclohexyl, tetralin, cyclohexylbenzene, benzene, cyclohexane and n-hexane. Furthermore the Prigogine-Flory theory has been used to predict activity coefficients at infinite dilution from the experimentally determined H _m ^E at 25°C and at finite concentrations for n-hexane and n-heptane with decalin, bicyclohexyl, tetralin and cyclohexylbenzene.     

Low-birefringence liquid crystal mixtures for photonic liquid crystal fibres application

ABSTRACT

Series of low-birefringence liquid crystal mixtures composed of alkyl alkylbicyclohexyl carbonates and modified mixtures with other compounds have been formulated, their refractive indices and electric permittivity measured upon temperature. They exhibit the ordinary refraction index n_o lower than the refractive index of silica glass in a different range of temperature. This enables to observe in photonic liquid crystal fibres (PLCFs) a change in the light propagation mechanism from photonic band gap guiding to modified total internal reflection at different temperatures. Selected applications of PLCFs are also discussed.     

Bicyclohexyl Interference in the Quantitation of Environmental Alkanes by Gas Chromatography

Abstract

Cyclohexane is the solvent of choice for the extraction of n-alkanes from environmental matrices. This solvent contains traces of bicyclohexyl. This impurity does not interfere with analyses at the ppm level, but is a potential problem at the ppb* level. Erroneous concentrations of n-tridecane could be obtained using conventional packed gas chromatographic columns. However, this problem is obviated by using capillary columns or combined gas chromatography - mass spectrometry.     

Activity of Mono-, Bi-, and Trimetallic Catalysts Pt-Ni-Cr/C in the Bicyclohexyl Dehydrogenation Reaction

The influence of metals with different redox properties and a carbon carrier on the activity of mono-, bi- and trimetallic Pt-Ni-Cr/C catalysts has been studied in the bicyclohexyl dehydrogenation reaction as the hydrogen release stage in hydrogen storage. An increase in the conversion (X > 62%) of bicyclohexyl and selectivity for biphenyl (S > 84%) was observed on trimetallic catalysts Pt-Ni-Cr/C compared with the monometallic catalyst Rt/C (X > 55%; S > 68%). It has been established that the increase in the conversion of bicyclohexyl and selectivity for biphenyl in the dehydrogenation reaction on trimetallic catalysts is due to an increase in the activity of Pt nanoparticles in the vicinity of local Cr-Ni clusters of solid substitution solutions.