Result Changes
Pure Component Property Changes
The default density of water was changed from 997.986 kg/m³ to 999.016 kg/m³, however, existing cases and new prebuilt cases would continue on with the older value. In newer Petro-SIM versions, new case may have the new value.
Jan 2026, Bug 22318: The freeze point for n-Hexane was added to the database. This may help reduce empty freeze point properties in streams with this component.
Dec 2025: Updated TGL component boiling points.
July 2025, Bug 14520: Update RON for MTBE.
Sep 2024, Bug 20836: Starting with 7.6.7027, 7.5.6500, 7.4.4505, 7.3.3800 and 7.7 and upwards, ROM and MON values for ethanol and methanol were revised. These are now the new default values:
| Component | Ron | Mon |
|---|---|---|
| Ethanol | 108.6 | 89.7 |
| Methanol | 108.7 | 88.6 |
Nov 2024: Modify iso and group component properties to be consistent.
Jan 2024, Bug 16229: Updated missing RON/MON for three trimethylcyclopentane components + Corrected MON of two trimethylcyclopentane components.
Model Changes
Petro-SIM V7.7
The default new heat exchanger model is now the end point model and no longer the weighted model. This model solves more reliably.