Release v8.47: Improved Matthias-Coppman parameters	20 April 2025
On Easter we released a new version with improved support for the Matthias-Coppman (MC) parameters, particularly for Peng-Robinson. The PCD manager can now compare the vapor pressure temperature correlations with the predictions of the equations of state. It can also fit the MC parameters for the SRK and PR and store the MC parameters for the PR-eos in a dedicated text file. This resulted in much improved performance for the UMR-PR.

Release v8.45: Improved Liquid-Liquid Equilibria Capabilities	5 January 2025
We improved the stability check of the Liquid-Liquid (LL) flash calculations and added support for LLE Cape-Open Property Packages such that Liquid-Liquid eXtraction columns (LLX) can acquire their properties via cape-open calls. The LLX columns now perform a density calculation on all the feeds to assign them as either a light or a heavy phases. Other improvements include the drawing of column internals in the panel of the operation, as well as icons on flowsheets for didactic purposes. We increased the number of points that can be computed in the parametric study option and we added new compounds in our libraries with Pure Component Data (PCD). Minor fixes include improvements for the phase diagrams and for the UMR methods as well as updated PCD data.

Release v8.44: Maintenance update	3 March 2024
This version of ChemSep has improvements for the handling of more than six different functional groups per molecule (for methods like UNIFAC). Total Reflux columns can now be dropped onto COCO flowsheets. The Interface can read X-files for a quick setup of a new simulation. Plots can be saved as SVG files. PCDman can read Stenutz information from the web and can load/save component list files (CLF) and various compressed formatted files (e.g. xlsx files). Finally, various Tall oil compounds, Pyridines, Anisoles, Chloro-compounds to our PCD libraries.

Release v8.41: Easy and Fast Dividing Wall Column Setup	23 July 2023
ChemSep LITE 8v41 extends the number of predefined divided wall columns (DWCs) and we added a new, simple pressure specification for that makes setting up a DWC simulation a breeze compared to other commercial tools. We also improved the Matthias-Copeman (MC) parameters for all compounds in our libraries. This will significantly enhance the performance of the PPR78, PSRK, and UMR-SRK Equations of State. For the UMR-PR all new parameters were determined, which now reside in its own library file mc-pr.lib. Editing PSRK and NIST UNIFAC groups is now supported, as well as entering up to 12 groups per molecule. Furthermore, our binary phase diagrams for Vapor-Liquid Equilibrium are improved and now feature an export to the Veusz drawing tool for producing diagrams ready for publishing. Finally, missing alkanal compounds were added to our PCD libraries.

Release v8.30: Drop-down selection of DWC's and Petroleum properties	16 May 2022
ChemSep LITE 8v30 features drop-down list selection of Dividing Wall Column configurations which simplifies the ease of use. We added petroleum properties such as Reid Vapor Pressure and ASTM D86 temperatures as reportable properties. These can become available in any CAPE-OPEN application/flowsheet when using ChemSep/COPP as a property package (for now, only in the COCO simulator). Our binary VLE tool can now search for available binary VLE data in literature and draws relative volatility diagrams. We also added a considerable number of bio-fuel type of components to our libraries.

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