OLI added blocks to Aspen PLUS (EFLASH and EFRAC)

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With the installation of the OLI interface for Aspen PLUS come two user added unit operations. These are the EFLASH and EFRACH blocks. The user must enable these added unit operations via the library function in Aspen PLUS. Each block has its own unique properties separate from Aspen PLUS unit operations.

EFLASH

The EFLASH block is unique in that it allows for four phase separation. No such unit exists in the standard Aspen PLUS unit operations. You can simultaneously separate a vapor, aqueous, organic and solid phases. Below is a schematic of the unit operation:

Eflash.png

EFRACH

The EFRACH unit operation is the Aspen PLUS equivalent to the OLI ESP multistage unit operations or to the older OLI ProChem/Frachem unit operations. Some chemical systems solve better and faster using the OLI EFRACH block over the RADFRAC block. In EFRACH, Aspen PLUS uses both the OLI thermodynamic properties as well as the OLI numerical solving routines. Below is a schematic of the EFRACH unit operation.


Efrach.png