The butadiene unit primarily comprises the upper section of the first extractive distillation column, the lower section of the first extractive distillation column, a stripping column, the second extractive distillation column, an acetylene flash drum, a raffinate water-washing column, a butadiene water-washing column, a light-component removal column, a heavy-component removal column, an acetylene water-washing column, a solvent recovery column, and an off-gas scrubbing column. The principal internal components include tray assemblies (floating valves, tray decks, downcomers, receiving trays, liquid-seal trays, and their corresponding support beams), oil collection tanks, gas–liquid feed distributors and distribution pipes, as well as fasteners such as bolts, nuts, clamps, and washers.
● Single-, double-, and four-overflow tray – Single-overflow tray / Double-overflow tray / Four-overflow tray / Floating valve / Sieve tray

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