Question

In methanol production. CO + 2 H2 → CH3OH Fresh feed gas containing 65.5 % H2, 32.0 % CO and 2.5 % inserts A is used. The product gas is cooled that completely separates the methanol and the unreacted gas including inert is recycled. A purge stream was provided to remove the inserts. The gas entering the converter (Fresh feed and Recycle) contains 24.0 % CO, while the gas leaving the cooler/separator contains 20.0 % CO. What is the efficiency of utilization of CO? What is the percent conversion of CO per pass?

Answer 1

Co + 2H2 CH3OH F (Fresh Reed) Cuzon - Reactor - Product Con 20./ Recycle Co-20% (BO Purge CP Fresh feed (f) = 65.5% H2 32.7. co 2.5%A let 100 mol basis of fresh feed H2 = 65.5 mo 3 Co- 32 mol - 2.5 mol Inert balance (A) A in fresh feed & Ain Purge 2.5 = MAXPL

Where ha mole fraction of A in purge The gas entering the Converter (fresh feedf Recycle) contain 24%. Co and the Recycle contain 20./.00 i to balance at the function when Recycle and fresh Feed mix. co in frech feed & Co in Recych = Coin. stream entering Converter 32 + 0.2 R = 6.24 LR+F) 32 = 0.24 F +0.04R 32 = 0.2ux)w to our 32-24 -0.our R = 200 mol Co in R = 0.2 x 2W - 40 mol Ratio of H2 in fresh feed to 2 .: This Ratie ù maintain in every sheam so In Recycle to 42 ratie is 2 - 2 in. Recycle a 2x 40 to my so R= 200 mot = cofun fa so molin Recycle

Uale. o o % of A in Recycle xlw efficiency of utilization coverai conversion of G . 60% of A is also in Purge sheen coin fresh feed - Coin Purge to in fresh feed ..NA = 0.4 from @ 2.5 = 0.4xp p = westeno 6.25 = 0.2xp a tears 1.25 A/2 in puage = 2.5 32 -1.25 32 so to in purge 96.17 % Conversion of to per pass to entering the Converter a loita leaving the Converter to entering the converter to entering the Converter = 72 mol to bearing the Converter to in purge & Coin Recycle 1.25 + 40 = 41.25 mol per pass Conversion 72-41-25 72 = 42071 %