The reactor outlet product stream (S-13) was cooled to 25℃ before entering a series of liquid-gas flash separators. The first flash separator (F-2) was operated at 0.1MPa and 25℃. The top product of the first flash (S-16) containing hydrogen and some amount of acetone was compressed to 8.5MPa before entering the second flash separator (F-3). The second flash (F-3) was modelled to maintain high pressure at 8MPa and low temperature at 5℃. Final hydrogen product was obtained from the top product stream (S-18) of the second flash separator containing a 95% mass fraction.