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 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. 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.

Configuration of a variety of DWC's with drop-down list DWC's with two condensers, two reboilers, Kaibel configuration, and double waals



 ChemSep v8.25 Update 17 February 2021 
This mainenance update mainly provides corrections e.g. for the PSRK and PPR78, as well as bug fixes e.g. for the exergy production in case of split feeds. Furthermore, loading of components from multiple PCD-libraries doesn't hamper the component selection and filtering anymore. Column program output while solving was made to become more concise and we added the fitting of LLE as a new feature (latest revision is 8v26 on 25 April 2021).



 ChemSep v8.20 Dividing Wall Columns with Multiple Condensers/Reboilers 24 March 2020 
This new release expands the type of configurations for our Dividing Wall Columns (DWCs). We also added expander and compressor flash calculations. The loading of thermodynamic model parameters was automated and takes plase while components are selected or a different model is chosen. We added property diagrams where the user can plot different thermodynamic as well as physcial properties as function of T, p, composition. Various updates are included for the UNIFAC and modified UNIFAC activity coefficient models as well as the PSRK and Predictive Peng-Robinson 78 Equations of State. The fitting of Group Interaction Parameters was improved, allowing the fitting of multiple Vapor-Liquid Equilibrium (VLE) data sets simultaneously. Also the binary VLE diagrams allow the reading of data from the comments field and to pick specific data sets for viewing. Several new compounds were added to our databases to handle some new example flowsheets that were added. Total Annualized Cost calculations were added and can be made available as Cape-Open parameters on the flowsheet level.



 Modeling Liquid maldistribution 31 May 2019 
At the 2019 Spring AIChE meeting Ross Taylor presented "Simulating Maldistributiion in Packed Columns". In this paper we review the literature on simulating packed columns with maldistribution. We then show how easily the ChemSep Parallel Column Model for DWCs may be used to describe maldistribution in packed columns and show how our results match the obtained results of earlier papers. We found a simple bed effectiveness approximation that allows the design of packed beds that are robust for the effects of liquid maldistribution. We illustrate with a practical example involving the design of acommercial scaleArgon column (from an air separation plant) with structured packing.



 ChemSep v8.11 Stream Curves 4 January 2019 
We released an update of ChemSep LITE 8v1 with stream curves as new feature, which allow calculation of heating/cooling curves for heat exchanger design (or deeper analysis). Any internal stream can be used, so that the condenser/reboilers can be handled. Furthermore, Matthias-Copeman EOS parameters can be fitted and we improved the extrapolation for CpIG to very high temperatures (e.g. 10000 K). We sped up the loading of large sep-file and fixed various bugs.



 ChemSep v8.0 Dividing Wall Columns 25 October 2018 
We released a version of LITE that can handle single wall DWCs. The model is illustrated with the BTX column as described by Luyben in Ind. Eng. Chem. Res. (2009) Vol. 48 pp. 6034-6049 . BTX Petlyuk / divided wall column



 ChemSep receives the CO-LaN Award for 2017 at the CAPE-OPEN 2018 Annual Meeting October 2018 
We attended the CAPE-OPEN 2018 Annual Meeting where we announced our release date for the new ChemSep LITE v8 and ChemSep was awarded the CO-LaN Award for 2017 for the the sustained and long-lasting involvement of ChemSep with CAPE-OPEN.



 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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