The NRTL-PA Aspen user model is now available for download. This model enhances the capabilities of Aspen to blend the capabilities of NRTL with that of the Wertheim association approach. Shown here is the methanol + cyclohexane system fitted to VLE and LLE. The NRTL-PA models the LLE and VLE simulataneously, whereas the NRTL fitted to LLE cannot simultaneously model the VLE shown with dashed lines.
The model is capable of using the CPA and PC-SAFT forms of association.
The release contains the following files:
readme.txt - an overview of the project
Wertheim_documentaion.pdf - a detailed description for use of the files
NRTL-PA_package.zip - a zip file containing
readme.txt
Wertheim_documentation.docx
nrtlpa.dll - the file that links to Aspen. Note that this is not a stand-alone file and that Aspen is required to use the file.
dlopt.txt - an example txt file needed to tell Aspen where to find the .dll
MEOH-HEP-CYC_SAFT.bkp - An Aspen Plus backup file with example set up.
We appreciate the advice of Paul Mathias (Fluor), Navin Patel, Timothy Frank (Dow, retired), Dung T. Vu, Eric Cheluget (Honeywell/UOP), You Peng (Dow), and particularly Sumnesh Gupta (Dow). This material is based upon work supported by the National Science Foundation under Grant No. 1603705 and the USDA National Institute of Food and Agriculture, Hatch/Multi-State projects MICL02585 and MICL04192. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the funding agencies.