Question

Hi, can you please help me with F? I know that if the volume is the same, negative order reactions would give PFR a higher yield, however, when I tried to do it mathematically, the units won't match because of the rate constant. I don't know how to prove that PFR would give a higher yield. Can i use the same rate constant but with different units?

3. Your boss asks you to isothermally carry out a liquid-phase, irreversible reaction AB with the following rate law: with k 0.20 L(mol*min)" a. Starting with a mole balance (& assumptions), calculate the time it would take a batch reactor to process your feed to achieve 95% conversion. The batch reactor is initially charged with 10 mol of pure A and the reactor size is 2L b. Again starting with a mole balance, calculate the residence time t (reactor volume/flow rate through reactor) it would take a PFR to process your feed to achieve 95% conversion. The PFR has an inlet feed of pure A at a rate of 10 mo/min and the volumetric flow rate is 2 L/min. c. Compare your results in a) and b) and explain their relationship. d. Starting with a mole balance (& assumptions), calculate the volume it would take e. Calculate the residence time for the CSTR in part d and compare it to part b. Which f. Now suppose instead that the reaction exhibits negative second-order kinetic for a CSTR to process your feed (from part b) to achieve 95% conversion. reactor yields the higher conversion given the same residence time? behavior (i.e. -rAkCa). How does this influence your decision in e) and why? Which reactor yields the higher conversion, given the same residence time? If the given reaction exhibited zero-order kinetic behavior (i.e. n -0) instead, how does this influence your decision in e) and why? Briefly explain your conclusion. g.

Answer 1

For negitive order, cstr will be given better performance than PFR .

since for negative order reaction ,rate is inversely praportional to concentration.

Curve will be in different manner giving cstr best performance