N-heptane System Research Articles

P, T, x, y data of benzene + n-hexane and cyclohexane + n-heptane systems

The isothermal vapour—liquid equilibria of the benzene + n-hexane and cyclohexane + n-heptane systems have been studied using a dynamic method. The thermodynamic consistency of the data has been tested and the prediction from several empirical and semitheoretical models have been compared with the experimental values of different excess properties.

Molar excess volumes of trans-decalin+benzene, +toluene, +isooctane and + n-heptane at 298.15 K

The molar excess volumes of the trans-decalin+benzene, +toluene, +isooctane and + n-heptane systems have been measured at 298.15 K. The experimental results are analyzed using the Flory and the Sanchez-Lacombe solution theories. The effects of the sizes and shapes of the component molecules and of the interaction energy in the systems are discussed.

Interfacial tensions and partition coefficients in water and n-heptane systems containing n-alkanols, alkylketones, alkylamides, and alkylmonocarboxylic acids

Interfacial tensions and partition coefficients in water and n-heptane systems containing n-alkanols, alkylketones, alkylamides, and alkylmonocarboxylic acids

A new method of parameter adjustment and diagnostic checks on gamma models used in vapor—liquid equilibrium calculations

A procedure based on the maximum likelihood principle applied to the general case when all variables are subject to random error has been developed for the estimation of parameters in thermodynamic relationship (gamma) models (eqns 2–5) from binary VLE x- T- P data sets. A high precision dynamic ebulliometry technique has been used to measure isobaric VLE in toluene-cyclohexane and methylcyclohexane- n-heptane system. Geometrical interpretation of the maximum likelihood principle for the VLE problem has led to plotting κ i s -distances (eqn 13) which are used as diagnostic checks on the models applied.

Phase equilibria of binary systems containing crystalline inclusion compounds. Part 1. The perhydrotriphenylene–n-heptane system

The vapour pressure of saturated solutions containing the perhydrotriphenylene (PHTP)–n-heptane inclusion compound as a solid phase shows a maximum at ca. 10 °C below the m.p. of the crystalline adduct. A second pressure maximum coincident with a eutectic point, is observed in the case of mixtures very rich in PHTP. Moreover, a sudden increase in pressure is observed in the case of pure or nearly pure inclusion compound in the close vicinity of the m.p. Such a behaviour is consistent with that predicted on the basis of the phase rule. The experimental values agree with those calculated by assuming the complete dissociation of the adduct in the liquid phase.

Ermittlung von ausgleichsfunktionen für thermodynamische messwerte binärer gemische ohne computer

The Redlich—Kister equation for thermodynamic excess functions can be transformed in such a way that the coefficients can be evaluated graphically up to 7 coefficients. As an example, the free excess enthalpy of the ethanol + n-heptane system has been fitted with respect to the mole fraction. The results is comparable with numerical fits. The equation is applicable to any thermodynamic function of binary systems.

Équilibre liquide-vapeur dans des systèmes binaires morpholine-hydrocarbures

Vapor-liquid equilibrium data have been obtained for the systems : n-hexane-morpholine, n-heptane-morpholine and methylcyclohexane-morpholine, at 760 mmHg. Refractive indices of the binary mixtures at 25 °C are also reported. The system n-heptane(1)-morpholine(2) shows an azeotrope at 97.67 °C and x1 = 0.885, and also the system methylcyclohexane(1)-morpholine(2) at 100.3 °C and x1 = 0.892. Data have been correlated by the Wilson equation.

Hydrocarbon radiolysis in the presence of carboranes(12) 3. Formation of product hydrocarbons

A study has been made of the effect of o-carborane on hydrocarbon formation in the radiolysis of n-heptane. The introduction of o-carborane into the n-heptane system reduced the yield of “intermediate” and dimeric hydrocarbon products. The inhibiting effect of o-carborane traces back to its electron-acceptor activity and its ability to deactivate the excited n-heptane molecule.

Thermodiffusionsfaktor von n-Heptan—Benzol mit einer Autokollimationsmethode / The Thermal Diffusion Factor of n-Heptane — Benzene

The concentration-dependence of the thermal diffusion factor α is determined in the binary system n-heptane - benzene at 25 °C. α ranges from 0.72 to 2.39 for the mole fraction of benzene going from 0.1 to 0.9. By the aid of a mirror the sensing light beam passes the cell twofold, which results in a corresponding higher sensitivity.

Kinetics of an interfacial polycondensation reaction. Part 1.—Hydrolysis of terephthaloyl chloride

The kinetics of hydrolysis of terephthaloyl chloride in a stirred, two-phase system n-heptane + aqueous buffer has been studied by following the rate of consumption of the acid chloride. The reaction is first order with respect to terephthaloyl chloride and the variation in rate constant with salt concentration has been examined. From studies at different temperatures it is calculated that the energy of activation is 12 kcal mole–1 and the Arrhenius frequency factor log10 A = 4.7 sec–1. It is concluded that the rate-determining step is the homogeneous hydrolysis of terephthaloyl chloride in the aqueous phase. The results of this study are used in part 2 to correct the rates of the interfacial polycondensation of terephthaloyl chloride with piperazine.

Vapour—liquid equilibrium studies for the ethane—n-pentane—n-heptane system at 150, 200, 250, 300 and 350°F

The vapour—liquid equilibrium behaviour of the ethane—n-pentane—n-heptane system was investigated at 150, 200, 250, 300 and 350°F for pressures approaching the critical state. This experimental investigation utilized the static method approach for a total of twenty-one cell charges of this system. Co-existing equilibrium vapour and liquid samples were analysed with a gas chromatograph. The results of this study, covering the pressure range from 400 psia up to the critical pressure, are tabulated and are presented graphically. In addition, the equilibrium compositions for the vapour and liquid phases together with their corresponding K values for composition parameters of C = 0·200, 0·400, 0·600 and 0·800 are also tabulated.