Problem Statement

How to make Oligomer volatile when using activity coefficient method?

Solution

Activity Coefficient method is using PLXANT parameter for flash calculation. But the default PLXANT value for polymer (or oligomer) is set to low value to disable the vaporization. And most of polymer activity coefficient method (except PNRTL-IG) is using RK EOS for vapor fugacity calculation. User need to adjust this value if needed.

User need to adjust following parameter to make the oligomer volatile.

- Adjust PLXANT parameter for Oligomer.
- Adjust TC, PC, OMEGA to reasonable value, default value from POLYMER Databank has very high value.

The test has been done with POLYNRTL method for Ethylene oligomer with 5 repeat unit. Phase diagram has calculate with Hexane.



Keywords

Activity Coefficient, POLYNRTL, Oligomer