# The Exothermic Reaction

Problem 1: There are two reactors of equal volume available for your use: one a CSTR,

the other a PFR.

#### How many pages is this assigment?

The reaction is second order, irreversible, and is carried out isothermally.

There are two ways you can arrange your system:

Scheme 1: Reactors in series: CSTR followed by PFR

Scheme 2: Reactors in series: PFR followed by CSTR

(a) If possible, state which system will give the highest overall conversion.

(b) If possible, state which system will give the lowest overall conversion.

Problem 2 The exothermic reaction

was carried out adiabatically and the following data recorded:

The entering molar flow rate of A was 300 mol/min.

(a) What are the PFR and CSTR volumes necessary to achieve 40% conversion? (VPFR = 7.2 dm3, VCSTR = 2.4 dm3)

(b) Over what range of conversions would the CSTR and PFR reactor volumes be identical?

(c) What is the maximum conversion that can be achieved in a 10.5-dm3 CSTR??

(d) What conversion can be achieved if a 7.2-dm3 PFR is followed in series by a 2.4-dm3 CSTR?

(e) What conversion can be achieved if a 2.4-dm3 CSTR is followed in a series by a 7.2- dm3 PFR?

[Please use the graph sheet provided you in blackboard]

Problem 3: The curve shown in Figure is typical of a reaction carried out isothermally, while tbe curve shown in Figure is typical of an exothermic reaction carried out adiabatically.

(a) Assuming that you have a CSTR and a PBR containing equal weights of catalyst, how should they be arranged for an isothermal reaction and for adiabatic reaction? In each case use the, smallest amount of catalyst weight and still achieve 80% conversion.

(b) What is the catalyst weight necessary to achieve 80% conversion in a well-mixed reactor with catalyst particles (e.g., CSTR)?

(c) What “CSTR” weight is necessary to achieve 40% conversion?

(d) What PBR weight is necessary to achieve 80% conversion?

(e) What PBR weight is necessary to achieve 40% conversion?

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