• Author / Uploaded
• amritrath

• Categories
• Ramas de la termodinámica
• Cantidades fisicas
• Química Física
• Química
• Termodinámica

Citation preview

SR-POLAR The SR-POLAR property method is based on an equation-of-state model by Schwarzentruber and Renon, which is an extension of the Redlich-Kwong-Soave equation of state. You can apply the SR-POLARmethod to both non-polar and highly polar components, and to highly nonideal mixtures. This method is recommended for high temperature and pressure applications

SR-POLAR requires: •

Polar parameters for polar components. These parameters are determined automatically using vapor pressure data generated from the General Pure Component Liquid Vapor Pressure model.

•

Binary parameters to accurately represent phase equilibria. The binary parameters are temperaturedependent.

If you do not enter binary parameters, the Aspen Physical Property System estimates them automatically using VLE data generated from the UNIFAC group contribution method. Therefore, the SR-POLAR property method is predictive for any interaction that UNIFAC can predict at low pressures. The accuracy of the prediction decreases with increasing pressure. You cannot use UNIFAC to predict interactions with light gases.

SR-POLAR is an alternative property method that you can use for nonideal systems, instead of using an activity coefficient property method, such as WILSON. Parameter requirements for the SR-POLAR property method are in the tables labeled Parameters Required for the SR-POLAR Property Method (see below) and Parameters Required for Common Flexible and Predictive Models. For details about optional parameters, and calculation of pure component and mixture properties, see Physical Property Models.

Mixture Types You can use the SR-POLAR property method for mixtures of non-polar and polar compounds, in combination with light gases.

Range You can use the SR-POLAR property method up to high temperatures and pressures. You can expect fair predictions up to about 50 bar. You can expect reasonable results at any condition, provided UNIFAC interaction parameters are available. But results are least accurate close to the critical point.

Parameters Required for the SR-POLAR Property Method Thermodynamic Properties

Models

Parameter Requirements

Vapor and liquid mixture Fugacity coefficient, Density

Schwartzentruber-Renon

TC, PC, RKUPPn, RKUKAn, n = 0, 1, 2

Enthalpy, Entropy, Gibbs energy

General pure component ideal gas heat capacity

(CPIG or CPIGDP)

Schwartzentruber-Renon

Optional: RKUPPn, RKUKAn, n = 0, 1, 2

OMEGA, RKULAn,

RKULAn,

Optional: RKUCn, RKUKBn

RKUCn, RKUKBn