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As seen in Figure 2.5, NGLs may be further separated into their components using this distillation column sequence. This distillation column sequence is chosen such that components are removed in order from lightest to heaviest. This enables easy separation because it reduces the flow rate sent to subsequent columns more than would separate the components in the opposite order. The columns operate at very high pressure (from 120 to 285 psig) because at low pressures all of these components are gases. This is done for all cases except for Feed #1.

Figure 2.5 Fractionation train.