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Thermodynamic Processes

Thermodynamic Processes

A thermodynamic process is a path through a sequence of states that takes a system from an initial state to a final state. In a cyclic process, the system returns to its initial state, so the changes in state properties and state functions (ΔT, Δp, ΔV, ΔU, ΔH) over one complete cycle are zero. However, heat and work transfers can still occur during the cycle, and the net heat and net work over the cycle need not be zero.A reversible process occurs when the system is infinitesimally close to...

Thermodynamic Background

Thermodynamic Background

The law of mass action states that "the rate of a chemical reaction is directly proportional to the product of the molar concentrations of the reactants." It means that the more 'active mass' or 'concentration' of the reactants present, the faster the reaction will proceed.In a chemical reaction, there are forward and reverse reactions. The forward reaction is the process where the reactants combine to form products. The reverse reaction is the process where the products break down to form the...

Thermochemical Equations

Thermochemical Equations

For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the enthalpy of reaction (also called the heat of reaction, ΔHrxn) is equal to the heat exchanged with the surroundings (qp).

Second Law of Thermodynamics

Second Law of Thermodynamics

In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...

Second Law of Thermodynamics

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The Second Law of Thermodynamics states that entropy, or the amount of disorder in a system, increases each time energy is transferred or transformed. Each energy transfer results in a certain amount of energy that is lost—usually in the form of heat—that increases the disorder of the surroundings. This can also be demonstrated in a classic food web. Herbivores harvest chemical energy from plants and release heat and carbon dioxide into the environment. Carnivores harvest the chemical energy...

Thermodynamics: Chemical Potential and Activity

Thermodynamics: Chemical Potential and Activity

The effective concentration of a species in a solution can be expressed precisely in terms of its activity. Activity considers the effect of electrolytes present in the vicinity of the species of interest and depends on the ionic strength of the solution. The activity of a species is expressed as the product of molar concentration and the activity coefficient of the species.
The thermodynamic equilibrium constant is more accurately defined in terms of activity rather than concentration.

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Termodinámica molecular para el diseño de procesos químicos.

Science (New York, N.Y.)

|August 24, 1979

Resumen

Los ingenieros químicos necesitan datos precisos de equilibrio de mezcla de fluidos para el diseño de procesos. La termodinámica molecular proporciona técnicas de estimación utilizando datos experimentales limitados cuando la caracterización completa es demasiado costosa o requiere mucho tiempo.

Área de la Ciencia:

Ingeniería Química Ingeniería Química.
La termodinámica es la termodinámica.
Química Física es la química física.

Sus antecedentes:

El diseño de procesos químicos se basa en datos precisos de equilibrio para las mezclas de fluidos.
La determinación experimental de estos datos a menudo requiere una gran cantidad de recursos (costo y tiempo).

Objetivo del estudio:

Para resaltar la necesidad de técnicas de estimación en el diseño de procesos químicos.
Introducir la termodinámica molecular como la ciencia fundamental para estas técnicas.

Principales métodos:

Utilizando la termodinámica molecular, una mezcla de termodinámica clásica y estadística.
La integración de los principios de la física molecular y la química física.
Empleando técnicas de estimación racional basadas en datos experimentales limitados.

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Principales resultados:

Estableció la termodinámica molecular como la base para predecir el equilibrio de la mezcla de fluidos.
Demostró la aplicación práctica de estos principios en la ingeniería química.

Conclusiones:

La termodinámica molecular es crucial para el diseño eficiente de procesos químicos.
Las técnicas de estimación derivadas de la termodinámica molecular superan las limitaciones experimentales.