Perspectives: Plant InSites

Distillation: Resist the Temptation

One option to infer internal flow rate in a column rarely makes sense

By Andrew Sloley, Contributing Editor
Jan 15, 2015

Some processes reward close control of liquid and vapor rates inside distillation columns. Conventional control approaches use a variation of flow metering based on either imposing a pressure drop inside the tower or drawing the stream out of the tower, metering it, and returning the stream to the tower (see: “Get Some Inside Information[],”  and “Ease Measurement of Column Internal Flow[]”).

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