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By J. F. Le Page

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1 8). In order to be accurate, however, we must add that this test is valid only as long as it is assured beforehand that the external diffusional limitations which also depend on dP are negligible. CONCLUSION One is accustomed to associating kinetics of reactions either with optimization of operating conditions, as for chemical engineers, or with concern for the reaction mechanism, as for scientists, chemists and physical chemists.

One cannot run the risk of relying on intuition alone; neither is it generally 1 GENERAL 15 justifiable to incur expenditure so great as to render the catalyst or the process uneconomical in the future. Instead, a methodical approach that relies both on experiment and fundamental principles is essential to fast and economical results. Any method to circumscribe the group of properties needed to catalyze a given reaction will include a three-stage operation to: (a) Identify the active agents. (b) Perfect the industrial catalyst.

F>o/ 7 � � �CH3 �. ;/ "\;"· "'o o'". '>o � '·" �' . "· ' : ,'"• Concurrent parallel reaction me­ chanisms, demonstrated through the catalytic hydrogenation under pressure of isopropyl benzene ( 1 ), a-xylene (2) and toluene (3). The catalyst is Raney nickel, the pressure 50 bar, and the temperature 1 50° C. Numbers on the arrows indicate reaction rates, as: FIG. 80 = 1 . 8 1 exp. Wauquier, J. , Jungers, J. C. Bull. Soc. Chim. France, 1 280, 1 957. FIG. 8 Graphical solutions for the ratios of Eq.

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