Modeling Processes with Equation Oriented Methods using Aspen Plus

Learn to configure, manipulate, and solve flowsheets in Equation Oriented (EO) solution mode and how to convert your sequential model (SM) simulations to EO. Learn when to use EO versus SM and how SM features are translated to EO. Troubleshoot common EO simulation errors.


  • Engineers new to equation-oriented modeling in Aspen Plus
  • Simulation engineers involved in design and/or in real time optimization
  • Users who want to learn the advantages of v 8.6 over previous versions of Aspen Plus 

Training Details

  • Course Id:


  • Duration:

    2 day(s)

  • CEUs Awarded:


  • Level:



  • Learn when to use the EO strategy over SM and how to efficiently convert your SM simulations to EO
  • Understand how SM features, such as Design Specs and Calculator blocks, are translated to EO
  • Manipulate the EO data entry, including Spec groups, EO input, and Analyzer blocks
  • Heat integrate your process using the Heater/HXFlux combination
  • Use Parameter Estimation and Data Reconciliation for model tuning
  • Optimize a process using EO Optimization
  • Effectively troubleshoot common EO simulation errors
  • Access to Aspen Plus at worksite is needed before and after the course in order to gain full benefit


  • Instruction on basic topics
  • Discussion about the general approach and the key elements for successful simulations
  • Instructor-guided demonstrations of the main features
  • Hands-on workshops that apply learned concepts
  • Detailed course notes


  • Attend  EAP101 Aspen Plus:Process Modeling
  • Designed as a stepping-stone between EAP101 Aspen Plus:Process Modeling and the EAP301 Aspen Plus: Real Time Modeling and Optimization courses, it is assumed that you are able to set up and run process models in sequential-modular (SM) mode in Aspen Plus.

Subsequent Courses

EAP301 Aspen Plus: Real Time Modeling and Optimization


Equation Oriented (EO) Modeling
  • Differentiate between Equation Oriented (EO) and Sequential Modular (SM) modeling  approaches within Aspen Plus
  • Discuss and demonstrate typical uses for EO Modeling
  • Review the EO modeling inputs and control panel functions 
  • Synchronize model from SM to EO
  • Workshop:  Examine EO variables and create a query for the column duties and product flowrates

Workflow (EO) Modeling Strategy
  • Review workflow and general changes which may be required to run EO simulation
  • Discuss reinitialization options and variables import/export
  • Workshop Experiment with reinitialization and export of variables;

Variable Specifications
  • Define and use Spec Groups and EO Input to change the Specifications of pairs of variables
  • Workshop Create a Spec Group and enter EO Input data; set the variable specifications so that the water mole fraction in a stream is fixed and the distillate rate is calculated;

  • Review how to specify connections
  • Workshop Create a connection to enforce pressure equality for inlet streams of Flash2 block;

User Calculations
  • Review and explain the options for User Calculations in the EO strategy
  • Use the automatic variable mapping capabilities and create local parameter in Calculator blocks
  • Review the setup of Analyzer block to generate EO variables
  • Workshop: Set up and run a Calculator block in EO mode.

Cyclohexane Flowsheet
  • Wrap-up workshop to review previous topics
  • Workshop Configure an existing simulation in EO mode with minimal guidance;

Heat Integration
  • Identify and explain the modeling options for heat integration
  • Use the Heater/HXFlux combination with Spec Groups and Connections to heat integrate your process in the EO simulation mode
  • Workshop: Determine refrigerant flow and process conditions.

Parameter Estimation
  • Identify the Tuning modes in the EO strategy
  • Learn how to setup a Parameter Estimation run
  • Workshop: Use Parameter Estimation to calculate heat transfer coefficient based on known process outlet temperature.

Data Reconciliation
  • Learn how to use Reconciliation mode to tune a model
  • Workshop: Use Reconciliation to calculate heat transfer coefficient by minimizing the measurement error in inlet flows and temperatures, and outlet cooling water temperature.

EO Optimization
  • Identify and explain equation oriented strategy for Optimization
  • Workshop: Find the process cooling temperature that maximizes the profit.

Sensitivity Analysis
  • Review how to setup an EO Sensitivity Analysis
  • Workshop: Perform an EO Sensitivity Analysis calculation

  • Discuss the purpose of Scripts
  • Review the syntax of scripts and how to execute them
  • Review some typical script applications

Troubleshooting Tips
  • Review common causes of EO convergence problems
  • Discuss troubleshooting tips for resolving EO convergence problems
  • Workshop: Review EO troubleshooting techniques

Equation Oriented Solvers (Optional)
  • Identify and explain the features and capabilities of the following EO solvers
    • DMO
    • LSSQP
    • NSOLVE
    • XSLP
  • Workshop: Use the different EO solvers and observe the output

Register for a Class

Date Class Type Location Price Language
Date(s): 09/13/2021 - 09/14/2021 Type: Public Virtual Location: Virtual-Americas Price: (USD) 1400.00 Language: English Register
Date(s): 08/30/2021 - 08/31/2021 Type: Public Classroom Location: 2500 Citywest Blvd, Suite 1600
Houston , Texas USA 77042
Price: (USD) 1400.00 Language: English Register
Date(s): 06/24/2021 - 06/25/2021 Type: Public Virtual Location: Virtual-Americas Price: (USD) 1400.00 Language: English Register
Date(s): 07/26/2021 - 07/27/2021 Type: Public Virtual Location: Virtual-Americas Price: (USD) 1400.00 Language: English Register
Date(s): 10/25/2021 - 10/26/2021 Type: Public Virtual Location: Virtual-Americas Price: (USD) 1400.00 Language: English Register
Date(s): 12/20/2021 - 12/21/2021 Type: Public Virtual Location: Virtual-Americas Price: (USD) 1400.00 Language: English Register
Date(s): 07/6/2021 - 07/7/2021 Type: Public Virtual Location: Virtual-APAC Price: (USD) 540.00 Language: English Register

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.