Multiple pumparounds

Multiple pumparounds Side-stream steam strippers Multiple side-product draw-offs Two-stage overhead system... 

Complex columns—e.g., multiple feeds, side products, interreboilers and intercondensers, pumparounds and side strippers—at or near the stages where these appear. See Sec. 4.1.1 for other examples. 

Complex distillation may be defined as a multistage vapor-liquid separation process that includes one or more of the following features multiple feeds, side draws, pumparounds, and side heaters or coolers. 

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