MEMSIC V1 is a calculation module for membrane separation simulating of a multi-constituent gas mixture as a function of upstream and downstream pressures, temperature, partial flow rate of each incoming constituent, or nature of the constituents, It is available as a CAPE-OPEN module compatible with PSE process simulation software such as AspenPlus®, Hysys®, Pro/II®, GPROMS®, PROSIM®, etc. Thus, from any PSE software (PSE: Process Systems Engineering), MEMSIC V1 module can be imported into the developed process diagram like any unit operation belonging to the operation library integrated in the PSE.