Prospectus

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PPP-6 Column Draw-Offs (Cont…)

Traditional Research Idea

Background and Discussion: Side and bottoms draw offs are common components of all columns - both trayed and packed. In the case of bottoms draw offs, there is often sufficient liquid residence time to allow degassing of the liquid so that outflow is predictable and operation does not suffer. In the case of side draw offs, however, the "liquid" being drawn is usually aerated and at equilibrium conditions. These two conditions combine with typically shallow liquid levels so that flashing in the throat of the outlet nozzle is a problem. Draw off connections are often sized based on other criteria with no consideration given to the physical conditions or internals inside the column. A benefit of this program is that it will draw attention to these details and underscore their criticality. The data and correlations derived from the program will provide the column designer with tools to enable him to easily consider and incorporate side and bottoms sump and draw off nozzle details into his design.

PROSPECTUS

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