Following the FT reactor, a three-phase flash is used to split the mixed stream into gas, liquid HCs and wastewater. As a simplification to the upgrading system, we use a distillation column (RadFrac) to separate gasoline from diesel. For the gas mixture in the simulation, we use an ideal separator (in the real world, PSA can be an option) to recycle all the C1 components. The GTL system contains inert gas (N2), which must be purged (otherwise, it will gradually accumulate in the recycle stream, making the convergence impossible to achieve). Here, the recycle stream is split to vent (to purge) and C1REC, which will be followed by splitting into reforming section and FT sections, respectively.