29921906 Sample Problem 7

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    Sample Problem #7:  A rectification column is fed 100kg mol/h of a mixture of 50 mol % benzene and 50 mol % toluene at 101.32 kPa abs ressure. !he feed is li uid at the boiling oint. !he distillate is to contain #0 mol % benzene and the bottoms 10 mol % benzene. !he reflux ratio is $.521. &alculate the kg mol/h distillate' kg mol/h bottoms' and the number of theoretical tra(s needed using the )c&abe*!hiele method. +sing grahical methods' calculate the minimum reflux ratio , m  and the minimum number of theoretical lates at total reflux.    Equilibrium data at column pressure, mole fraction benzene   x(x(0.100.210.-00.#0.200.30.00.-0.300.510.00.#10.$00.-$0.#00.#-0.500.20.#50.#      Solution: Step 1: Draw diagram 100 kgmols/heedli uid at boiling ointx    0.5totalcondenser artialreboiler 4ottoms  x 4   0.16istillate  x 6   0.#, $.52 6istilling&olumn 101.32 kPa 67 0   , min      7 0  n min      n        Step 2: Plot equilibrium data on c!abe $iele diagram 489:898 !;7+898 <=<!8) 00.20.$0.-0.100.20.$0.-0.1 %      &