Question

A liquid phase reaction occurring in adiabatic PFR has a heat of reaction -120000 J/molK. Specific heat of the stream is 10000 J / molK. The temperature difference for complete conversion to be achieved is ___

(a) 560 K

(b) 8.33 K

(c) 12 K

(d) 83.33K

This question was posed to me in an interview for job.

This intriguing question originated from RTD for Chemical Reactors topic in section Distribution of Residence Time for Chemical Reactors of Chemical Reaction Engineering

Answer 1

Right option is (c) 12 K

The best explanation: \(\frac{C_p ∆T}{-H_R}\) = XA

XA = 1 for complete conversion.

∆T = \(\frac{120000}{10000}\) = 12 K.