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+//Kunii D., Levenspiel O., 1991. Fluidization Engineering(II Edition). Butterworth-Heinemann, MA, pp 491
+
+//Chapter-15, Example 1, Page 369
+//Title: Circulation Rate when Deactivation Controls
+//==========================================================================================================
+
+clear
+clc
+
+//INPUT
+thalf=1;//Half life of catalyst in s
+F=960;//Feed rate of oil in tons/day
+W=50;//Weight of the bed in tons
+a=0.5;//Activity after time equal to half life
+abar=0.01;//Average activity of the catalyst
+
+//CALCULATION
+Ka=-log(a)/thalf;//Rate constant is s^-1, assuming I order kinetics from Eqn.(12)
+Fs=Ka*W*abar/(1-abar);//Circulation rate of solids from Eqn.(16)
+x=(Fs*60*60*24)/F;//Circulation rate per feed of oil
+
+//OUTPUT
+mprintf('\nSolid recirculation per feed of oil =%ftons of solid circulated/ton feed oil',x);
+
+//====================================END OF PROGRAM ======================================================
+\ No newline at end of file