DWSIM is an open-source chemical process simulator written in VB.NET, with advanced thermodynamic calculations, reactions support, petroleum characterization / hypothetical component generation tools and a fully-featured graphical user interface.


  • Process Flowsheet Diagram (PFD) drawing Interface
  • VLE calculations using Equations of State, Activity Coefficient and Chao-Seader models
  • Characterization of Petroleum Fractions using bulk properties and/or ASTM/TBP distillation curves and creation of Hypothetical Components using UNIFAC groups
  • Rigorous Distillation/Absorption Column models
  • Support for Chemical Reactions and Reactors
  • Supports ChemSep’s Component Database
  • Multivariate Optimization and Sensitivity Analysis utility

Freeware Files

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