Ch07

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Unformatted text preview: Exercise 7.1 Subject: Comparison of absorption, distillation, and stripping Find: Differences between absorption and distillation, and stripping and distillation Analysis: Absorption Feed is gas Second phase (absorbent) is added Operation can be adiabatic Single-section cascade Can be almost isothermal Can not separate a closeboiling mixture Tray efficiency can be low Stripping Feed is liquid Distillation Feed is liquid, vapor or a mixture of the two Second phase (stripping agent) Second phase is created by is added heat transfer Operation can be adiabatic Single-section cascade Can be almost isothermal Can not separate a closeboiling mixture Tray efficiency can be moderate Must have heat transfer at the top and bottom stages Two-section cascade Can have a large temperature range Can separate a close-boiling mixture Tray efficiency can be high Exercise 7.2 Subject: Emergence of packing to replace trays. Find: Reasons why some existing trayed towers are being retofitted with packing, and some large-diameter columns are being designed for packing. Ana...
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