Aspen Plus: Physical Properties for Process Engineers

Course Id:  EAP201   |   Duration:  2.00 day(s)   |   CEUs Awarded:  1.4   |   Level:  Intermediate

Course Objective

Develop the skills and techniques required to specify and use thermodynamic property models in your steady-state and dynamic simulations by gaining a better understanding of the Aspen Plus physical properties system. Build and troubleshoot property models using the property analysis to tabulate and plot properties of pure components and mixture. Determine pure component and binary interaction parameters using experimental data or estimation methods. Gain some knowledge about the main property models commonly used for property calculation such as activity coefficient models and equation of state.

Course Overview

  • Learn how to specify and use properties in your steady-state and dynamic simulations by gaining a better understanding of the Aspen Plus physical properties system


  • Learn how to select physical property methods appropriate for your process
  • Modify physical properties and supply data to improve the accuracy of an existing model
  • Understand how to validate physical properties
  • Gain practical knowledge in estimating and regressing missing parameters
  • Learn how to use the physical property features of Aspen Plus and Aspen Properties


  • Individuals who want to strengthen modeling skills by learning how to use the physical property features of Aspen Plus and Aspen Properties


  • Instruction on basic topics
  • Demonstrations of general features
  • Instructor-guided exercises
  • Hands-on workshops that apply learned concepts
  • Example problems
  • Detailed course notes


  • A background in process engineering
  • EAP101 (Aspen Plus: Process Modeling) is helpful, but not required

Subsequent Courses

Develop additional expertise with these recommended courses:

  • EAP250      Aspen Plus: Distillation Modeling
  • EAP2980    Modeling of Processes with Aqueous Ionic Solutions - Electrolytes and Salts
  • EAP2911    Solid Modeling using Aspen Plus

Class Schedule

Class Agenda

EAP201: Aspen Plus: Physical Properties for Process Engineers

Introduction to Flowsheet Simulation

  • Identify and explain the need for accurate physical properties by studying a variety of examples
  • Introduce basic concepts:
  • Thermodynamic properties (density, enthalpy)
  • Transport properties (viscosity, )
  • Phases (vapor, liquid, liquid-liquid)
  • Demonstrate how to start and navigate in Aspen Properties user interface

Ideal Gas and Ideal Liquid
  • Explain and review the IDEAL property method
  • Ideal Gas Law for the vapor phase
  • Calculation of the vapor phase enthalpy
  • Calculation of the liquid phase properties
  • Introduce the concept of routes and models
  • Workshop: Analyze pure component properties using the Property Analysis tool

Physical Property Parameters
  • Explain and review physical property parameters and databanks
  • Workshop: Retrieve and display parameters for the IDEAL model

Property Sets and Property Analysis
  • Show how to use interactive property analysis
  • Explain how to create and use property sets
  • Show how to create and use property analysis tables
  • Workshop:  Analyse properties of a mixture using the Generic Property Analysis

Activity Coefficient Models
  • Explain how activity coefficient models may be used to model large deviations from ideal mixture in liquid phase
  • Workshop: Use mixture property interactive analysis tools and display binary and ternary equilibrium diagrams  

  • Explain the UNIFAC method
  • Basis
  • Limitations and applicability
  • Workshop: Demonstrate how to create user defined UNIFAC groups

Henrys Law
  • Explain how to use Henrys law with activity coefficient models
  • Workshop: Analyze solubility for supercritical components (optional)

Equation of State
  • Discuss Issues in Modeling Non-Ideal Systems Using Equations of State, Corresponding States Principle, Mixing Rules, Alpha function
  • Discuss special equation of state for water/steam or specific mixtures
  • Workshop:  Show how an equation of state can be used to model the expansion of a gas mixture through a valve

Advanced Equation of State
  • Identify how some equation of states can be extended to improve predictions for strongly non-ideal mixtures (e.g. PSRK predictive Soave-Redlich-Kwong EOS)
  • Explain how vapor phase association models may be used with activity coefficient models (e.g. NRTL-HOC)
  • Discuss PC-SAFT EOS
  • Workshop: Use PC-SAFT EOS for VLE and LLE calculations

Selection of Physical Property Methods
  • Explain how to select the thermodynamic model based on the type of components and conditions
  • Review the different levels at which property methods can be specified in a simulation
  • Workshop: Demonstrate how to select the appropriate property method for different systems

Electrolyte Property Methods
  • Review the ELECNRTL activity coefficient model for electrolyte systems
  • Explain how to set up properties for a simulation using electrolytes
  • Workshop: Evaluate liquid-vapor equilibrium for an electrolyte mixture

Data Regression
  • Explain the basics of Data Regression in Aspen Plus  and how to setup a Data Regression Run
  • Workshop: Regress Pure Component Data

Data Regression of Mixture Data
  • Explain how to perform Mixture or Phase Equilibrium Data Regression and how to interpret regression results
  • Workshop: Regress vapor-liquid, liquid-liquid and salt saturation experimental data

Solid-Fluid Equilibrium

  • Explain how to perform solid-fluid equilibrium analysis
  • Workshop: Model solid-liquid equilibrium

Property Constant Estimation
  • Describe the purpose of the Property Estimation
  • Explain the workflow to use the Property Estimation to define the molecular structure of components and specify the estimation methods
  • Explain the methods available to estimate binary parameters
  • Workshop: Estimate pure component parameters and binary interaction parameters s

Customizing Property Methods
  • Explain how to customize physical property methods
  • Workshops: Change various settings in property methods 

Aspen Technology, Inc. awards Continuing Education Units (CEUs) for training classes conducted by our organization. One CEU is granted for every 10 hours of class participation.