P2-7B The adiabatic exothermic irreversible gas-phase reaction 2A +B → 2C is to be carried out in a flow reactor for an equimolar feed of A and B. A Levenspiel plot for this reac- tion is shown in...

Extracted text: P2-7B The adiabatic exothermic irreversible gas-phase reaction 2A +B → 2C is to be carried out in a flow reactor for an equimolar feed of A and B. A Levenspiel plot for this reac- tion is shown in Figure P2-7B. 500,000 400,000 300,000 FAO - rA 200,000 100,000 + ++ 0.3 0.6 0.9 Figure P2-7B Levenspiel plot. (a) What PFR volume is necessary to achieve 50% conversion? (b) What CSTR volume is necessary to achieve 50% conversion? (c) What is the volume of a second CSTR added in series to the first CSTR (Part b) necessary to achieve an overall conversion of 80%? (Ans.: VcSTR = 1.5 x 10°m') (d) What PFR volume must be added to the first CSTR (Part b) to raise the conversion to 80%? (e) What conversion can be achieved in a 6 x 10+ m' CSTR? In a 6 x 104 m' PFR? (f) Think critically (cf. Preface, Section H, page xxviii) to critique the answers (numbers) to this problem.


Extracted text: P2-4B The exothermic reaction of stillbene (A) to form the economically important trospophene (B) and methane (C), i.e., A B+ C was carried out adiabatically and the following data recorded: 0.2 0.4 0.45 0.5 0.6 0.8 0.9 -TA (mol/dm³-min) 1.0 1.67 5.0 5.0 5.0 5.0 1.25 0.91 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 = 72 dm', VCSTR = 24 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 105-dm3 CSTR? (d) What conversion can be achieved if a 72-dm' PFR is followed in series by a 24-dm' CSTR? (e) What conversion can be achieved if a 24-dm3 CSTR is followed in a series by a 72-dm3 PFR? (f) Plot the conversion and rate of reaction as a function of PFR reactor volume up to a volume of %3D 100 dm'.