1.8 Ethanol is to be oxidized to acetaldehyde in aqueous solution. The aldehyde can further oxidize to acetic acid, which can decarboxylate to methane. There is an excess of O2 in the solution; so all reactions are first order in the organics and irreversible. (a) Write out the species mass-balance equations to be solved in PFTR and CSTR reactors. (b) Find C,(t) in PFTR and CSTR. (c) For CA0=0.1 mole/liter, find the optimum residence times, conversions, and selectivities to acetaldehyde in PFTR and CSTR. The rate coefficients with a certain catalyst are 1.0 , 0.1, and 0.2min1, respectively. (d) Sketch a reactor-separator configuration that will separate products and recycle unused ethanol. What is the best reactor? (e) What reactor size is required if we need to produce 100moles/h of acetaldehyde? (f) How would your answer change if the second reaction step were second order