Elementary Principles 93

# Elementary Principles 93 - 4.60 a Basis 100 mol feed/h Put...

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4- 52 4.60 a. Basis : 100 mol feed/h. Put dots above all n ’s in flow chart. reactor cond. 100 mol/h 32 mol CO/h 64 mol H 2 / h 4 mol N 2 / h 500 mol / h x 1 (mol N 2 /mol) x 2 (mol CO / mol) 1-x 1 -x 2 (mol H 2 / h) n 1 (mol /h) .13 mol N 2 /mol n 3 (mol / h) x 1 (mol N 2 /mol) x 2 (mol CO / mol) 1-x 1 -x 2 (mol H 2 / h) Purge Mixing point balances: total: (100) + 500 = 1 n ± 1 n ± = 600 mol/h N 2 : 4 + x 1 * 500 = .13 * 600 x 1 = 0.148 mol N 2 /mol Overall system balances : N 2 : 4 = .148 * 3 n ± 3 n ± = 27 mol/h Atomic C: 32 = 2 n ± + x 2 *27 2 n ± = 24.3 mol CH 3 OH/h Atomic H: 2 * 64 = 4*24.3 + 2*(1-0.148- x 2 )*27 x 2 = 0.284 mol CO/mol Overall CO conversion : 100*[32-0.284(27)]/32 = 76% Single pass CO conversion : 24.3/ (32+.284*500) = 14% b. Recycle: To recover unconsumed CO and H
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