Question

me liquid methanol condensate is withdrawn as a product, and the gas stream leaving the ondenser, which contains CO, H2, and 0.40 mol% CH3OH, is the recycle stream that combines ith the fresh feed. a. Draw and label the flow diagram. (2 marks) b. Calculate the fresh feed rates of CO and H2 (5 marks) Hint: don't start with the overall process balances as the equations are not independent. c. Calculate the single pass and the overall all conversion of CO. (5 marks) d. Calculate the ratio of recycle to feed. (2 marks)

Answer 1

R Co d2 H2 CHOOH 0.004 CH, OH Reactor Condenser I moj Co 24 He co+ 2 H₂ CH, OH CH₂OH Balance: in out a gen at gen - cons. R 22 frome fresh feed & let FR mol coenters to Reactor. from Recycle enters moles of co moled of of co entering to (fey R29) total Reactor. let y fraction converto in CH₂OH 80 co consumed (FG+ R22) y H2 Consumed 2(F2, + R22) Y produced (FX, + R22) y 80 apply CH ₂ OH Balance at Condenser CH₂OH 0.004 Rt 1 0.004R+ (Foot R22) y Condenser: co Balance out R X2 at Balance (F to + + R22)(1-4) H₂ condergen F1-x1) + R(0.996 - 12) - 2 (fx t RX.) y = R(6.996-2) 3

f&q=1 en + Fant R22 : R22 +1 ean » » *(1-xo) + 2(FX + R22) y egn @ (F%,+ R22) Y from ea" ☺ & f(1-21)-2 -- cho foresh feed of co= flo - I mol f(1-2) = amol (Exxt R22) 4 (fra + RX2) yolooy % Single pass conversion. of co 1 X 100 % - 100% overall conversion (Fan + RM2) 4 x 100% (FX, In of co dla RX2 + R (0.996 – 22) +0.004R FR, + f(-x) iz $ -f%e] šte (-] 322 w/so