Abdelmoneim Sahab Adday
Create a New Simulation:Open Aspen Plus and create a new simulation. Define the components you want to include (e.g., N2 and O2 for air). Define the Reaction:Set up a reaction that represents the formation of air from its constituent elements (N2 and O2). (Note: The stoichiometric coefficients are based on the molecular formula of air.) The reaction equation for air formation is:N2+1.5O2→AIRN2+1.5O2→AIR Specify Thermodynamic Properties:In Aspen Plus, you’ll need to specify the thermodynamic properties for the components (N2 and O2) and the reaction. Use the Peng–Robinson equation of state (EOS) with Boston–Mathias modification to calculate the properties 1. Estimate DGFORM:Unfortunately, Aspen Plus does not directly provide DGFORM values for individual components. You can estimate DGFORM using the Joback Group contribution method or other estimation techniques 2. Alternatively, you can use external databases or literature values for DGFORM.
To obtain the standard Gibbs free energy of formation (DGFORM) for air (which typically consists of nitrogen and oxygen), you can follow these steps in Aspen Plus:
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Richard Sherritt
Create a new simulation with components AIR, N2, O2, AR, CO2, H2O.
While in the Properties Environment, select Retrieve parameters from Home/Tools on the the Menu Ribbon.
Answer OK, and Yes to view the parameters.
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Richard Sherritt
Aspen assigns 0 to the standards Gibbs free energy of air. This is reasonable because the main components of dry air are N2, O2 and Ar, which all have a standard Gibbs free energy of 0.
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