OLI Flowsheet: ESP

If your company licenses a commercial flowsheet simulator, stay with it!

Please look for OLI as a property method in OLI Alliance Products. The advantages are significant for working with a User Interface (UI) that is already known, with features that support your work process.

   However, if your flowsheet applications are electrolyte-primary and the OLI thermodynamic methods are sufficient for your process, then a flowsheet simulator designed especially to work with electrolytes may be an advantage for you.

   Why OLI Flowsheet: ESP?


    OLI Flowsheet: ESP is the choice when you have an electrolyte-only or electrolyte-primary process:

  • Original requirements and specifications were steered by 6 companies in an OLI industry consortium

  • OLI Flowsheet: ESP  is a powerful steady-state electrolyte process simulator

  • OLI Flowsheet: ESP can simulate aqueous chemical processes for a wide range of markets

  • Unique and fast convergence capabilitie, critical for electrolyte processing

  • OLI Flowsheet: ESP remains the most complete expression of OLI electrolyte thermodynamics, and contains flowsheet capabilities that include reaction kinetics and mass transfer in columns as well as more usual flowsheet units. 

Unit Operations

Unit operations include neutralizers, absorbers, strippers,

reactors, compressors, and exchangers, as well as standard

split, separate, mix and component split. Reverse Osmosis
(RO) will be ready later in 2017, followed by other membrane



Flowsheeting and control


Process flowsheeting with multiple recycles and control loops

are allowed in OLI Flowsheet: ESP. Feedforward and feedback
controllers and Manipulate blocks help to achieve process

 Hydrocarbons in OLI Flowsheet: ESP


Although this is an electrolyte process simulator, hydrocarbons are effectively modeled. Both OLI's MSE and AQ models accept pseudocomponents and hydrocarbon components as part of process input. In the AQ model, hydrocarbons are modeled using the SRK equation of state for both the gas phase and the hydrocarbon-rich nonaqueous liquid phase. In the MSE model, the SRK equation is used for the gas phase whereas both the aqueous and the hydrocarbon-rich liquid phases are modeled using the MSE activity coefficient model.



The Sensitivity Block in OLI Flowsheet: ESP in V9.5.3 or later, allows clients to determine the sensitivity of output results to changes in Block Parameters and physical constants.

User Interface (UI)


For clients who used the earlier ESP Original software, OLI Flowsheet: ESP is a welcome change. Well designed and easy to anticipate.

Ionic input is accepted through the OLI Studio interface and dragged-dropped into an OLI Flowsheet: ESP stream.


A convergence monitor, a trace facility for key variables and callout blocks for annotating the flowsheet make it possible to track progress through complicated control loops and convergence patterns.


What about Dynamic Simulation?

OLI Flowsheet: ESP is a steady-state flowsheet simulator and there are no plans to introduce dynamic simulation into this product.


However, if you have an electrolyte application that would benefit from a dynamic simulation, please contact us for access to OLI DynaChem, a tool that we can use to develop a dynamic simulation for you. DynaChem allows the study of dynamic response of a process. The software can be used to examine control strategy, potential upsets, scheduled waste streams, controller tuning, and startup/shutdown studies. Studies of pH and compositional control, batch treatment interactions, multistage startup and shutdown, controller tuning, multicascade and adaptive control are all possible. 

Case Templates

At OLI we are interested in our clients' success.  We welcome the opportunity to discuss your particular application with us.

OLI has developed a roster of 25 case templates that you can access to get started on your own application. 

Applications include but are not limited to:

  • lime softening,

  • sour water stripping,

  • flue gas scrubbing,

  • product distillation,

  • reagent chemical purification,

  • amine sweetening, and

  • environmental/geochemical modeling. 

Application assessments are free and come with no obligation.