It is desired to carry out the gaseous reaction A → B in an existingtubular reactor consisting of 50 parallel tubes 40 ft long with a 0.75-in. inside diameter. Bench-scale experiments have given the reaction rate constant tor this first-order reaction as 0.00152 s”1 at 200 °F and 0.0740 s”1 at 300 °F. At what temperature should the reactor be operated to give a conversion of A of 80% with a feed rate of 500 lbm/h of pure A and an operating pressure of 100 psig? A has a molecular weight of 73. Departures from perfect gas behavior may be neglected, and the reverse reaction is insignificant at these conditions. (Ans.: T = 275 °F.) (From California Professional Engineers Exam.)
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