Problem Statement

How to make Oligomer volatile when using equations of state method?

Solution

Equations of State method is using fugacity coefficient for flash calculation so the oligomer is volatile in default. Segment property is used for the calculation of oligomer. But the volatility may not be a correct because this model is purposely designed for high molecular polymer. User need to adjust following parameter to get the reasonable volatility.

- Adjust parameter for Segment. (For example, PCSFTR, PCSFTU and PCSFTV need to be adjusted)

You can see the test result, the test has been done for Ethylene oligomer with 5 repeat unit and Hexane mixture.
For this case, only the PCSFTR of ethylene segment has slightly adjusted from 0.04 to 0.03

Keywords
PC-SAFT, Oligomer