Calculation of the gas velocity in an empty tower after the tower diameter is rounded
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After rounding the diameter of the packed distillation column and calculating the gas velocity in an empty column, the resulting value does not fall within the range of (0.5–0.8)Uf, where Uf is the bubble point gas velocity. So, does it mean that the tower diameter needs to be adjusted again so that the gas velocity in the empty tower equals the critical gas velocity in the range of (0.5～0.8)?
Not necessarily; a coefficient less than the critical gas velocity is also acceptable. Don’t make that coefficient too small; it’s just a waste. It won’t work when it gets bigger.
May I ask where I can find that standard reference?
I recommend that you read the book \"Tower Equipment\" or the book \"Principles of Chemical Engineering\". Not all operating conditions fall within the range of 0.5–0.8Uf; in most stripping towers, it is the liquid phase rather than the gas phase that determines the tower diameter!