Published: 8 April 2024| Version 1 | DOI: 10.17632/nz7p8bhhs3.1
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## Steps to reproduce

We took the following steps to verify that the software connectivity, data maps, and calculations are working correctly. The work was verified by replicating the published example problem from the textbook by Seader and Henley [Reference 2]. In all cases, we achieved the exact same answers as in the published solution. We also had each contributor download the files and follow the procedure in the instructions file to make sure the guidance is correct. In the example, air containing only nitrogen and oxygen is continuously separated into a nitrogen-enriched retentate stream and an oxygen-enriched permeate stream by gas permeation through a low-density polyethylene membrane. The membrane is in the form of a thin-film composite with a 0.2-μm-thick membrane skin. A total of 20,000 SCFM of clean dry air with composition 79 mol% N2 and 21 mole% O2 at 150 psia and 78 deg F is sent to the separator. The solubilities and diffusivities of nitrogen and oxygen are taken from Table 14.6 in the reference. The material balance and molar flux equation are used to calculate the membrane area in square feet as a function of the cut (moles in the permeate divided by moles in the feed). Pressures of 150 psia on the retentate side and 15 psia on the permeate side are assumed, with perfect mixing on both sides of the membrane, such that compositions on both sides are uniform and equal to exit compositions. Pressure drops and any mass transfer resistances external to the membrane are neglected. The solution shown here is also slightly different in one other respect. In the solution shown here, the user specifies the membrane area, and the cut and product flows and compositions are calculated. In the author's solution in Reference 2, the cut is specified. References [1] Biaglow, Andrew (2023), “Simple Membrane Unit in Mathematica Linked to CHEMCAD ”, Mendeley Data, V1, doi: 10.17632/cdcgbsrrhc.1 [2] J. Henley and E. Seader, Separation Process Principles, New York: Wiley, 1998, Example 14.5, pp. 705-707.