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 ChemSep v7.4 UNIFAC (NIST) May 2018 
We added the UNIFAC group contribution method by NIST Thermodynamics Research Center (TRC) and access to the Viginia Tech (VT) COSMO databank. The UNIFAC (NIST) was defined with more main groups (89) and fitted on VLE, LLE, and SLE data with more group interaction parameters (984) than the original UNIFAC (FPE388p128) and will provide much better descriptions of vapor-liquid equilibria in distillation column simulations than the original UNIFAC. The VT sigma profiles will be used in COSMO-based activity and equation of state thermodynamic models.



 ChemSep PCM (Parallel Column Model) April 2018 
ChemSep user interface has been adapted to fully automate the input for simulating Divided Wall Columns (DWC) as demonstrated at the Spring AIChE 2018 meeting in Orlando. The GUI has been adapted to automatically display profiles and McCabe-Thiele plots for this type of columns, allowing a rapid analysis and optimization. A new version of ChemSep that includes the PCM model will be released later in spring.



 ChemSep v7.3 Export to COCO flowsheets December 2017 
New in release 7.30 is the ability to export any column or flash simulation to a flowsheet in COCO. Furthermore, we added refinements in our solving algorthms to enhance convergence.



 ChemSep v7.2 Column Rating October 2017 
To facilitate actual column design we added a new rating panel for a rapid design of the column internals. This new feature was demonstrated at the CAPE-OPEN 2017 Annual Meeting in London. The rating panel includes the new Duss-Taylor efficiency estimation that provides realistic estimates for tray efficiency and packed bed HETP based on the liquid viscosity and local equilibrium line slope for the design component. The columnn is automatically split into column sections from the placement of feeds and draws, but the user is free to add and remove them. Each column section can be designed individually. The completed column design can then directly be loaded into a vendor tool to obtain hydraulic performance e.g. pressure drops and flood fractions and further detail tray layouts. The supported tools are KG-Tower of Koch-Glitsch, WinSorp of Raschig, and SulCol of Sulzer chemtech. The rating panel also contains a Total Anualized Cost (TAC) estimate for the chosen hardware design. This enables the user to perform parametric studies to determine the lowest TAC as function of reflux or boilup ratio, number of stages, feed locations etc.
In release v7.2 we made further improvements to our column initialization such that convergence improved, especially for problems where compositions and recoveries are specified without providing estimates on the column. This particularly improves the rebustness of ChemSep column used in flowsheet calculations. Finally, by including group contribution method parameters in our sep-files it is now possible to fit these group interaction parameters on multiple binary vapor-liquid equlibria data sets, using our binary phase diagram drawing tool.



 ChemSep v7.1 Improved Graphics January 2016 
Earlier versions of ChemSep relied on the external GNUplot program to display column profiles and McCabe-Thiele diagrams. New in ChemSep 7.1 is an internal graphics package that can show the plots instantly, leading to a more rapid review of results. An intuitive Click-and-Drag functionality allows you to zoom into any detail:

Internal graphics    zooms into    Internal graphics



 ChemSep CAPE-OPEN Property Packages Explained October 2015 
At the Annual 2015 CO-LaN meeting held at Shell Global Solutions, we presented the development of the ChemSep Cape-Open Property Packages, "CS/copp", and showcased benefits by means of trace analysis examples on our ASU and MEG flowsheets.



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