What is the temperature and pressure range of TMVOC？

TMVOC was developed for the modeling of VOCs migration in the unsaturated zone and in shallow aquifers. For this reason the EOS was not designed for high P and T conditions. There are no stated P&T limits for TMVOC because they depend on the fluid mixture modeled.

For pure water and NCGs, basically the code can run up to the limits of pure water correlations employed, i.e. 1000 bar and 350°C, with a loss of accuracy on gas phase properties and NCG solubility in the aqueous phase as P goes up.

When VOC are included, then the max T is the lowest critical T of the VOCs modeled, because the solution of 3-phase thermodynamic equilibrium implemented requires that all VOCs may exist as a liquid phase. This is the reason why CH4, ethane and ethylene are available among the NCGs.

TMVOC was not developed thinking to the modeling of CO2 sequestration, an emerging topic at that time. Supercritical CO2 sequestration may in principle be simulated, including CO2 as an NCG, but CO2 gas phase properties might not be reliably estimated at high P and for sure CO2 solubility would be overestimated. With CO2 as an NCG, no CO2 phase transitions may be simulated. 

In principle, CO2 might be included as a VOC by supplying all critical and transport parameters required. In this case CO2 phase transitions could be simulated, but the highest T would be the CO2 critical T, probably too low to simulate the CO2 sequestration in a depleted gas reservoir. I also wonder how accurate could be the thermodynamic equilibrium of the CO2-CH4 mixture.

I have never tried, but may be somebody already did it.

I think TOGA should be the only simulator at present distributed by LBNL able to simulate the 3-phase flow conditions evolving in a low T depleted gas reservoir when CO2 is injected.

Alfredo