Review the oxidation of forma ldehyde to formic acid reactions over a vanadium titanium oxide catalyst [Ind. Eng. Chem. Res. , 28, 387 (1989)] shown in the ODE solver algorithm in the Summary Notes on the CD-ROM.
(a) Plot the species concentrations as a function of distance down the PFR for an entering flow rate of 100 dm3/min at 5 atm and 140°C. The feed is 66.7% HCHO and 33.3% O2. Note any maximum in species concentrations.
(b) Plot the overall HCOOH yield and overall selectivity of HCOH to CO, of HCOOCH3 to CH30l-I and of HCOOH to HCOOCH3 as a function of the Oo2. Suggest some conditions to best produce formic acid. Write a paragraph describing what you find .
(c) Compare your plot in part (a) with a similar plot when pressure drop is taken into account with a = 0.002 dm-3.
(d) Suppose that E1 = 10,000 cal/mol, E2 = 30,000 cal/mol , E3 = 20,000 cal/mol , and E4 = 10,000 cal/mol, what temperature would you recommend for a 1000-dm3 PFR?
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