Question

10.6-5. Steam Stripping and Number of Trays. A relatively nonvolatile hydrocarbon oil o tains 4.0 mol % propane and is being stripped by direct superheated steamin a stri ping tray tower to reduce the propane content to 0.2%. Thetemperature is hella stant at 422 K by internal heating in the tower at 2026 × 105 Pa pressure. A total 11.42 kg mol of direct steam is used for 300 kg mol of total entering liquid. The va por-liquid equilibria can be represented by y = 25x, where y is mole fraction pro- pane in the steam and x is mole fraction propane in the oil. Steam can be considered as an inert gas and will not condense. Plot the operating and equilibrium lines and determine the number of theoretical trays needed. Ans. 5.6 theoretical trays (stepping down from the tower top)

Answer 1

25 1+X o 0o2- Balance sayuitm 2. Y, solvent free stea. 41-43-0.04161" 2x1 288-= 木Mo / Fot the Point A (x, , y) and B(XM) and o pen tine A o in Jhon 격 starte na にne 11eyvalibrium and vert al doon, hom 2 oded ne F0)low tte m.lan Prol edire 2-1.tho kelau.

EQUILIBRIUM DATA

nocessary 0.9 0.8 0.7 0.6 0.5 0.4 0.2 0.1 0.005 0.01 0.015002 0.025 0.03 0.035 0.04o X Liquid Mole Ratio_Propane

B (0.04167. 1,0004) 0.8 0.6 Aperating 0.2 002.0) .0 0 O002 0.004 0.000 0.008 0.01 0012 0.014 0016 0.018 0.02 0.022 0.024 0026 .028 0.03 0.032 0.034 0.030 0.038 0.04 .042 0.044 0.040 quilibriun