By E E Ludwig
Quantity II is a part of a 3 quantity set. quantity 1 covers subject matters from 1-7. This quantity covers: eight. Distillation; nine. Packed Towers.
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Extra info for Applied Process Design for Chemical and Petrochemical Plants, Vol. 2
Do not round-off decimal or fractions of trays until after efficiency has been included. Actual Reflux Ratio, LID Figure 8-28. Relationship of reflux ratio and theoretical trays, for Example 8-12. 2 Round-off to: 40 trays plus reboiler plus total condenser. Note: If there is any reason to know that the efficiency of this system is usually lower (or in same chemical family), then either the efficiency should be reduced to account for this or the trays should have an additional allowance. In practice, this same column might be installed as 40 trays in one plant, 45 in another and 50 in another.
P. Frac. 65 42 1,762 1,804 mm The 1,804 mm compares to the balance value of 1,800 mm I20 psig. ) perchlorethylene. ) of the trichlorethylene can be accepted in the bottoms. Because the process system that will receive vents from this condensing system is operating at 5 psig, allow 5 psi pressure drop to ensure positive venting and set top of tower pressure at 10 psig. p. 0 Overhead -/,. 80 T h a l Condition of the Feed at 158°F At conditions of feed tray, assume pressure is 15 psig 1,533 mm Hg.
Even so, in light of the AIChE study discussed below, some of these empirical methods can be off by 1540%. Comparisons indicate these deviations are usually on the safe or low side. The relation of Drickamer and Bradford  of Figure 8-29 has been found to agree quite well for hydrocarbon, chlorinated hydrocarbons, glycols, glycerine and related compounds, and some rich hydrocarbon absorbers and strippers. The relation of O’Connell (Figure 8-29) has generally also given good results for the same systems but generally the values are high.