Relationship of Thermodynamic Properties to.Molecular Structure. Heat Capacities and Heat Contents of Hydrocarbon Vapors.

Souders, Mott; Matthews, Chris; Hurd, C. O.

doi:10.1021/ie50473a035

Cited by 45 publications

(6 citation statements)

References 6 publications

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“…For the reported thermal conductivities of each substance, the group k*X was calculated and plotted against the corresponding heat capacity (25,63) for constant reduced temperatures ranging from Tr = 0.6 to TR = 6.0. For the substances having a critical compressibility factor of approximately zc = 0.291, straight lines whose slopes were approximately A resulted for each reduced temperature.…”

Section: Treatment Of Experimental Thermal Conductivitiesmentioning

confidence: 99%

Atmospheric Thermal Conductivities of Gases of Simple Molecular Structure.

Misic¹,

Thodos²

1963

J. Chem. Eng. Data

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Section: Treatment Of Experimental Thermal Conductivitiesmentioning

confidence: 99%

Atmospheric Thermal Conductivities of Gases of Simple Molecular Structure.

Misic¹,

Thodos²

1963

J. Chem. Eng. Data

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“…The heat capacities of hydrocarbons presented by Souders, Matthews, and Hurd (28) were used exclusively in this study. The product k*h when related to the heat capacity at the three temperature levels, T R = 0.6, 0.8, and 1.0, produced on log-log coordinates the relationships of Figure 1 olefins, and acetylenes exhibit an identical behavior.…”

Section: Treatment Of E X P E R I M E N T a L T H E R M A L C O N D Umentioning

confidence: 99%

The thermal conductivity of hydrocarbon gases at normal pressures

Misic¹,

Thodos²

1961

AIChE Journal

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Dimensional analysis has been applied for the correlation of the thermal conductivity of a gas to its temperature, molecular weight, heat capacity, and critical constants. This approach indicates that the group k*h/C, should be a function of zc and T,, where h = M1/aT,1/E/Poa/3. Experimental thermal conductivities of hydrocarbons a t normal pressures (approximately 0.2 to 5 atm.) have been used to develop two relationships. The first is applicable to all types of hydrocarbons for 0.6 < T R < 3.0 with the exception of methane ond the cyclic hydrocarbons below TR = 1.0, for which the other relationship is applicable. These two relationships have been used to calculate thermal conductivities for twenty-eight gaseous hydrocarbons for which experimental data are available. Calculated values for normal paraffins, isoparaffins, olefins, diolefins, acetylenes, naphthenes, and aromatics produce an average deviation of 2.4% from experimental values for 154 points considered.

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“…Se han desarrollado métodos para la predicción de la capacidad calorífica y la entalpía de hidrocarburos en fase gas basados en la estructura molecular (Souders et al 1949). Hougen et al (1960) presentan un método aplicable al cálculo de la presión crítica, la temperatura crítica y el volumen crítico de fluidos y fue desarrollado sólo para sustancias orgánicas de baja masa molecular.…”

Section: Introductionunclassified

Método de Contribución de Grupos: una Herramienta Fundamental en cursos Avanzados de Termodinámica y Física de Fluidos para la Estimación de Propiedades de Sustancias

Fierro¹,

Faúndez²,

Valderrama

2016

Form. Univ.

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ResumenSe presenta un Método de Contribución de Grupos (MCG) para la estimación de propiedades de sustancias y se plantea como un método básico que podría ser incluido en cursos avanzados de termodinámica, fisicoquímica y física de fluidos. La idea es mostrar a los alumnos que las propiedades físicas y fisicoquímicas de las sustancias están relacionadas con su estructura química y características físicas y químicas de los átomos y grupos químicos que forman una molécula. Por lo tanto el método considera que una molécula está formada por grupos definidos a los que se les asigna un determinado valor como contribución al valor de una propiedad. Luego se supone que dicha contribución es la misma en todo compuesto donde dicho grupo esté presente. Este trabajo presenta algunos ejemplos que pueden ser mostrados en un curso formal y propone temas de tareas cortas y semestrales. Las tareas involucran conceptos generales asociados a la termodinámica, conocimiento sobre planillas de cálculo y manejo de bases de datos. Se discute sobre la utilidad del MCG como una herramienta en la metodología de aprendizaje basado en problemas. Se concluye que este tipo de conceptos y métodos se ajustan bien a cursos avanzados de pregrado o en tópicos y cursos de postgrado, en disciplinas como física, química, ingeniería química y otras afines.Palabras clave: contribución de grupos; método Joback-Reid; termodinámica; temperatura de fusión; aprendizaje basado en problemas Group Contribution Method: A Fundamental Tool in Advanced Courses of Thermodynamics and Physics of Fluids for Estimating Properties of Substances AbstractThe so-called Group Contribution Method for estimating properties of substances is presented and discussion about its use as a basic method that could be included in advanced courses of thermodynamics, physicalchemistry and physics of fluids is done. The idea is to show students that physical and physical-chemical properties of substances are related to their chemical structure and to the physical and chemical nature of the atoms and groups that form a molecule. Therefore, the method considers that a molecule is formed by defined groups to which a contribution to a given property is assigned. After that, it is assumed that such a contribution is the same in any compound in which that group appears. This works presents some examples that can be shown in a formal course and proposes short and long term assignments. The assignments involve general concepts of thermodynamics, knowledge of spreadsheets calculations, and management of data bases. The usefulness of the Group Contribution Method as a tool in learning methodology based on problems is also discussed. It is concluded that that this types of methods are appropriate for advanced undergraduate and graduate courses of physics, chemistry, chemical engineering and related areas.

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Relationship of Thermodynamic Properties to.Molecular Structure. Heat Capacities and Heat Contents of Hydrocarbon Vapors.

Cited by 45 publications

References 6 publications

Atmospheric Thermal Conductivities of Gases of Simple Molecular Structure.

Atmospheric Thermal Conductivities of Gases of Simple Molecular Structure.

The thermal conductivity of hydrocarbon gases at normal pressures

Método de Contribución de Grupos: una Herramienta Fundamental en cursos Avanzados de Termodinámica y Física de Fluidos para la Estimación de Propiedades de Sustancias

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