June 2010

Columns

HP Control: Total- or partial-draw configuration

Ever wonder why some main fractionators are designed with partial-draw trays, whereas others are total draws? A typical partial-draw with pumparound configuration is shown in Fig. 1. Liquid is taken f..

Friedman, Y. Z., Petrocontrol

Ever wonder why some main fractionators are designed with partial-draw trays, whereas others are total draws? A typical partial-draw with pumparound configuration is shown in Fig. 1. Liquid is taken from the draw tray into a side stripper, and stripped, typically by steam, to become a side product. Pumparound is a device for removing heat from the column. It circulates liquid from the draw tray, via heat exchange, back to the column several trays above the draw. The now subcooled liquid exchanges heat by condensing vapor on these three or four trays, and thus, the pumparound section trays are used solely for heat exchange, having no separation effect.  

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