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[cruam]

Dear All

How can I make a correct estimation for Residence time for packed and tray columns in an Amine plant?
I know residence time for packed column should be estimated for initial design and for detail should ask from a vendor. also I find some equations to calculate this time in tray columns (Perry's handbook).
but for basic design , not sizing, I need a true estimate.

Thank you so much

[katmar]

These are difficult factors to estimate accurately. In tray design, as part of the calculation of the pressure drop across the tray, it is necessary to calculate the liquid depth and aeration factor (density). From this (plus the tray geometry) you can calculate the mass on the tray, and by combining it with the mass flow rate you can get the residence time.

With packed columns I have only seen generalized hold up correlations for the regime below the loading point, but nobody actually runs their columns in this regime. Packing manufacturers publish hold-up data for particular packings all the way up to the flooding point, but this is almost always for the air-water system. This is probably as good as you can get unless you have proprietary knowledge.