Example 19-6 — A vertical thermosyphon reboiler is to provide18 507 kg/hr of vapor which is almost pure butane. The columnoperates at a pressure of 1896 kPa(ga) corresponding to a nearly isothermal boiling point of 109°C. Heat will be supplied bysaturated steam at 862 kPa(ga). A recirculation ratio of 4:1 orgreater should be employed. What is the optimum exchanger tofulfill this requirement? (Assume negligible inlet and outletpiping pressure drops.)
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