A simple empirical function for density computation using the measured refractive index of some selected hydrocarbons

Hädrich, Jürgen

doi:10.1063/1.432421

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…The refractivity of hydrogen sulfide was based on an empirical relationship used previously by Hadrich (7) for hydrocarbons. This relationship is…”

Section: Discussionmentioning

confidence: 99%

“…The refractivity of n-heptane was obtained directly from the results reported byKaka et al (9) in their work on the carbon dioxide-n-heptane system.The refractivity of hydrogen sulfide was based on an empirical relationship used previously by Hadrich( 7 ) for hydrocarbons. This relationship iswhere A , B, and Care chafacteristic constants of the material and depend on the wavelength of light.…”

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confidence: 99%

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Equilibrium phase properties of the toluene-hydrogen sulfide and heptane-hydrogen sulfide binary systems

Ng¹,

Kalra²,

Robinson³

et al. 1980

J. Chem. Eng. Data

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Vapor and llquld equilibrium phase compositions have been determined for the toluene-hydrogen sulflde and n-heptane-hydrogen sulflde binary systems at temperatures of 100.0!, 175.0, 250.0, and 400.0 O F at several pressures between the vapor pressure of the hydrocarbon component and the vapor pressure of hydrogen sulflde or thtr critical pressure for the system, whichever was higher. Refractive Index measurements were made on the equilibrium vapor and llquid phases for the hydrogen sulfide-m-heptane system at the three lower temperatures. These measurements were used with the phase composition data to calculate the equlllbrlum phase densltles using the Lorentr-Loren2 molar refractivity relationship.The solublllties of sulfur dioxide In water-acetonitrile solutions were determined at 25 and 50 OC and total pressure of 101.3 kPa. The solubilities are expressed In grams of sulfur dioxide dissolved/100 g of solute gas-free solution. At 25 OC two phases are observed when the overall composition lies between 20 and 80 wt % acetonitrile. The composition of each phase remains constant but the fraction of each phase Is altered as the overall composltlon changes. Above 40 OC only one phase is observed for i:he entire composition range.

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“…The refractivity of hydrogen sulfide was based on an empirical relationship used previously by Hadrich (7) for hydrocarbons. This relationship is…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Equilibrium phase properties of the toluene-hydrogen sulfide and heptane-hydrogen sulfide binary systems

Ng¹,

Kalra²,

Robinson³

et al. 1980

J. Chem. Eng. Data

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show abstract

“…The refractive index of the ethane/propane mixture, needed for calculation of the scattering vector, was determined from experimental density measurements and an empirical Lorentz-Lorenz relationship (12). Incorporating the errors from the viscosity and refractive index calculations into the Stokes-Einstein relation results in a maximum error in the hydrodynamic radius of approximately 5%.…”

Section: Phase Behaviormentioning

confidence: 99%

Inverse Emulsion Polymerization of Acrylamide in Near-Critical and Supercritical Continuous Phases

Beckman

Fulton

Matson

et al. 1989

ACS Symposium Series

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The inverse microemulsion polymerization of watersoluble acrylamide monomers within near-critical and supercritical alkane continuous phase provides a potential route for production of polymers with novel physical properties and at high reaction rates. In order to define conditions for a model polymerization process, the phase behavior of a nonionic surfactant/ acrylamide/water system in near-and supercritical mixtures of ethane and propane was examined. Results show that in mixtures of ethane and propane the continuous-phase density determines the phase behavior. Results also show that acrylamide acts as a co-surfactant with C 16 E 2 /C 12 E 4 (Brij) surfactant blend used for these experiments. Surprisingly, increasing the total dispersed-phase volume fraction lowers the density (and consequently pressure) required to form a stable microemulsion. Dynamic light scattering results suggest the presence of strong micelle-micelle interactions, or clustering, the extent of which increases rapidly as the phase boundary is approached. Initial polymerization results indicate possible dependencies of both the polymerization rate and the molecular weight on continuous-phase density and/or the degree of micelle-micelle clustering, suggesting that the monomer may not be as accessible to a growing chain as in a classical emulsion polymerization.Emulsion polymerization is an important commercial process because, in contrast to the same free-radical polymerization performed in the bulk, molecular weight and reaction rate can be increased simultaneously (1-3). Furthermore, the lower viscosity of an emulsion system compared with that of the corresponding bulk process provides better control over heat transfer. Commercial emulsion processes usually use a surfactant/water/monomer system

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Mean polarizabilities and second and third virial coefficients of the gases C2H4, C2H6, and SF6

Häusler

Kerl

1988

Int J Thermophys

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A simple empirical function for density computation using the measured refractive index of some selected hydrocarbons

Cited by 4 publications

References 4 publications

Equilibrium phase properties of the toluene-hydrogen sulfide and heptane-hydrogen sulfide binary systems

Equilibrium phase properties of the toluene-hydrogen sulfide and heptane-hydrogen sulfide binary systems

Inverse Emulsion Polymerization of Acrylamide in Near-Critical and Supercritical Continuous Phases

Mean polarizabilities and second and third virial coefficients of the gases C2H4, C2H6, and SF6

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