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Unformatted text preview: 3.8 in2 = 0.433 ft2 77.2 For the top tray, qL = 77.2 gpm. hda = 0.03 100(0.433) hdf = (6.47 + 0.61 + 0.095) / 0.5 = 14.4 in. liquid 2 = 0.095 in. liquid 128 For the bottom tray, qL = 128 gpm. hda = 0.03 100(0.433) hdf = (3.67 + 1.08 + 0.262) / 0.5 = 10.0 in. liquid 2 = 0.262 in. liquid The new operation is not acceptable in the rectifying section because % flooding is 95%, causing very high entrainment. Should retrofit that section with structured packing. Bottom section is operable with the trays if the higher pressure drop is acceptable. Exercise 7.50
Subject: Determination of HETP from experimental data for a packed column separating benzene and dichloroethane at total reflux. Given: 10 feet of packing, with operation at 1 atm. Vapor-liquid equilibrium data in terms of benzene mole fractions. Measured benzene mole fractions are xD = 0.653 and xB = 0.298. Find: HETP in inches. Limitations of the use of the HETP for design. Analysis: In the plot below, the y-x equilibrium data and the operating line (45o line for total reflux condi...
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