Aniline via nitrobenzene hydrogenation

Vapor-phase catalytic hydrogenation of nitrobenzene (C6H5NO2 + 3H2 -> C6H5NH2 + 2H2O, highly exothermic) with excess hydrogen, a high-pressure flash recovering unreacted H2 as a recycle vent, then a reduced-pressure flash stripping residual water from the crude aniline. Honesty notes: the reactor is a stoichiometric conversion model (98%), not a nitrobenzene-specific rate law — this solver has no curated hydrogenation kinetics for this reaction. The final aniline/water cut is a single-stage flash, not a multi-tray column: aniline and water are a genuinely non-ideal, partially-miscible pair, and this solver's UNIFAC-based decanter (the tool built for exactly that miscibility gap) doesn't have nitrobenzene's group decomposition, so a real plant's decant-then-distill sequence isn't fully modeled here.