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Applied Process Design for Chemical and Petrochemical by E E Ludwig

By E E Ludwig

Quantity II is a part of a 3 quantity set. quantity 1 covers themes from 1-7. This quantity covers: eight. Distillation; nine. Packed Towers.

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I O Applied Process Design for Chemical and Petrochemical Plants 28 vaporized in a flash vaporization process at a temperature of 40°F and a pressure of 600 mm Hg abs? At a total pressure, TC, the temperature of flash must be between the dew point and bubble point. 50 - 40- 30- L L L Vapor Press. 16 20 - 10 10 0 I I 20 30 I 40 I so I 60 I I I I 70 BO 90 100 ASSUMED MOCSVAPOR Figure 8-22. Extrapolatlon curve to determine approximate value of V”for Example 8-7. 24 NOT a check, reassume V=- and recalculate.

Solution. 0 1. 0 on left diagonal R scale and extend to cut Tie Line 1. 2. Transfer this value across the central maze to Tie Line 2. 3. Connect this point on Tie Line 2 with 20 on the right hand h i n scale to cut the right diagonal S scale at 35 (calc. 9). The number of theoretical plates required will be 35. It will be noted that if any three of the four variables, S, Smin, R, and Rminare known, this chart can be used by an analogous procedure to give the fourth. where S = theoretical plates at any reflux Smin = minimum number of theoretical plates R = any reflux ratio Rmin = minimum reflux ratio ‘‘PinchConditions” on x-yDiagram at High Pressure Wichterle et al.

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 [16] 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 [49](Figure 8-29) has generally also given good results for the same systems but generally the values are high.

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