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 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 Annual 2017 CO-LaN 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.
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.



 ChemSep v7.0 Released July 2015 
To enable others to take advantage of our thermodynamic and physical property methods and components database, we developed the ChemSep Cape-Open Property Package: "CS/copp". Now it is possible for others to use the ChemSep implementations of the predictive-SRK or Universal Mixing-Rule Peng-Robinson inside other tools that lack these models, i.e. inside UNISIM Design (Hyprotech) and Pro/II (SIMSCI). Take advantage of the super-simple setup in the ChemSep interface to define a property package and then use it in any compliant flowsheet you need it. This can be particularly useful in mixture with many isomers where measuring all compounds is an undo-able task (e.g. for modeling oxygenates in MTO processes).



 Robust and flexible column specifications January 2014 
On our downloads page we added a several new flowsheets e.g. the hydration of Ethylene Oxide to Mono-Ethylene Glycol (MEG), a gas cracker producing Ethylene and Propylene, a Natural Gas separation train, reactive distillation processes for producing Tert-Amyl Methyl Ether (TAME) and Methyl Acetate, refinery light ends separations, EthylBenzene (EB) production from Ethylene and Benzene, dehydrogenation of 2-Butanol to Methyl Ethyl Ketone (MEK) or of Methanol to DiMethyl Ether (DME), and LNG Refrigeration Cycles for Natural Gas. These flowsheets showcase different separation techniques such as extractive distillation, pasteurization sections for obtaining very pure products, pumparounds, multiple effect evaporization, and reactive distillation. ChemSep handles the column modeling in these flowsheets with ease, employing component concentrations and recoveries specifications or more advanced specifications such as the concentrations at specific stage.



 Application of FRI Tray Efficiency Model in Column Simulation and Design April 2013 
At the 2013 Spring AIChE meeting in San Antonio we presented together with ConocoPhillips a paper on the application of the FRI valve tray efficiency model where we feature the total reflux simulation facility inside ChemSep. We show how the FRI model was implemented in our equilibrium column model and how FRI measured composition and temperature profiles could be closely match FRI data. Included is also a comparison between the model and two industrial columns, a C4 splitter reported by Klemola et al. and a dehexanizer reported by Jakobsson et al.



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