Such a distillation column is typically called a depropanizer.
2.
The overhead product from the deethanizer is ethane and the bottoms are fed to the depropanizer.
3.
The overhead product from the depropanizer is propane and the bottoms are fed to the debutanizer.
4.
The recovered NGL stream is sometimes processed through a fractionation train consisting of three distillation towers in series : a deethanizer, a depropanizer and a debutanizer.
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