A catalytic reactor is used to produce formaldehyde from methanol in the reaction CH3OHHCHO+H2 A single-pass conversion of 60% is achieved in the reactor. The methanol in the reactor product is separated from the formaldehyde and hydrogen in a multiple-unit process. The production rate of formaldehyde is 900kg/h. (a) Calculate the required feed rate of methanol to the process (kmol/h) if there is no recycle. [3 marks] (b) Suppose all the unreacted methanol is recycled back to the reactor and the single-pass conversion remains 60%. Calculate the required fresh feed rate of methanol (kmol/h) and the rates (kmol/h) at which methanol enters and leaves the reactor. [6 marks] (c) Cheaper methanol containing 4% by weight of water is available. The water has no effect on the reaction and appears with the methanol recycle. Calculate the purge rate and composition of methanol and water if the methanol-water stream leaving the separator is 6000kg/h. Verify that the overall mass balance is satisfied. [10 marks] (d) What factors will influence the decision to use the cheaper methanol? [1 mark] A catalytic reactor is used to produce formaldehyde from methanol in the reaction CH3OHHCHO+H2 A single-pass conversion of 60% is achieved in the reactor. The methanol in the reactor product is separated from the formaldehyde and hydrogen in a multiple-unit process. The production rate of formaldehyde is 900kg/h. (a) Calculate the required feed rate of methanol to the process (kmol/h) if there is no recycle. [3 marks] (b) Suppose all the unreacted methanol is recycled back to the reactor and the single-pass conversion remains 60%. Calculate the required fresh feed rate of methanol (kmol/h) and the rates (kmol/h) at which methanol enters and leaves the reactor. [6 marks] (c) Cheaper methanol containing 4% by weight of water is available. The water has no effect on the reaction and appears with the methanol recycle. Calculate the purge rate and composition of methanol and water if the methanol-water stream leaving the separator is 6000kg/h. Verify that the overall mass balance is satisfied. [10 marks] (d) What factors will influence the decision to use the cheaper methanol? [1 mark]