Case II: Consider a reaction in a mixed reactor under changing flow condition so that concentration is constant. Let parallel deactivation occurs. Assume the main reaction to be n^th order and the deactivation reaction to be of first order in activity ‘a'. 

Parallel deactivation

Rate equation Deactivation rate

........................... .........................

Since concentration is constant,

For mixed reactor,

(9)

Now ,

For first order activity, d =1

Again,

Then substituting ‘a' in equation (9)

Plotting versus ‘t' gives a straight line of slope of k_d and intercept

Fig. 2 . Plot to determine rate constant and deactivation rate constant for a reaction over deactivating catalysts for mixed reactor, changing flow condition and parallel deactivation

 

Book Reference :

 

•  O. Levenspiel , Chemical reaction engineering, John Wiley & sons. 1995

•  R. J. Farrauto & C. H. Bartholomew, Fundamentals of Industrial catalytic Processes, Blackie Academic & Professional, 1997

•  H. S. Fogler, Elements of Chemical reaction engineering , Prentice Hall of India, 1999

•  J. M. Smith, Chemical Engineering Kinetics , McGrawHill Book Company, 1981

•  J.J. Carberry , Chemical and catalytic reaction Engineering, Dover Publications, 2001