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19 Nov 2019

The elementary gas phase reaction

It is carried out isothermally in a flow reactor with no change in pressure. The specific reaction rate is 0.25 min-1. A enters the reactor at a molar flow of 2 mol/min. Calculate the reactor volume to achieve 80% conversion in:

a)CSTR,

b)PFR

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Related questions

P6-4B The elementary gas-phase reaction

(CH3)3COOC(CH3)3 → C2H6 + 2CH3COCH3

A → B + 2C

is carried out isothermally at 400 K in a flow reactor with no pressure drop. The specific reaction rate at 50°C is 10–4 min–1 (from pericosity data) and the activation energy is 85 kJ/mol. Pure di-tert-butyl peroxide enters the reactor at 10 atm and 127°C and a molar flow rate of 2.5 mol/min, i.e., FA = 2.5 mol/min.

(a) Use the algorithm for molar flow rates to formulate and solve the problem. Plot FA, FB, FC, and then X as a function of plug-flow reactor volume and space time to achieve 90% conversion.

(b) Calculate the plug-flow volume and space time for a CSTR for 90% conversion.

The elementary gas –phase reaction is carried out isothermally in a flow reactor with no pressure drop. The specific reaction rate at 50 oC is and the activation energy is 85 kJ/mol. Pure di-tert-butyl peroxide enters the reactor at 10 atm and 127 oC and a molar flow rate of 53 mol/min.

b. If the PFR is replaced by PBR with a catalyst mass of 100 kg, , what will be the value of pressure drop?

c. Explain what are the parameters that affect the pressure drop across the packed bed reactor.

Additional information:

The elementary gas phase reaction 2A→B is carried out in a constant-volume batch reactor where 50% conversion is achieved in 1 hour. Pure A is charged to the reactor at an initial concentration of 0.2 mol/dm3. If the same reaction is carried out in a CSTR, what volume would be necessary to achieve 50% conversion for a molar flow rate of 500 mol/hr and an entering concentration of A of 0.2 mol/dm3?

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