Parametric sensitivity in co-currently cooled tubular reactors

✍ Scribed by L.H. Hosten; G.F. Froment

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 675 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)87194-9

✦ Synopsis

An intrinsic criterion was derived for parametric sensitivfty and r-way in co-currently cooled tubular reactors. It is essentially based on the approach of Van WelseMere and Froment (1970) developed for the constant wall temperature case and which-makes use of fundamental properties of the trajectory in the temperature vs. partial pressure plane. The criterion limits the maximum allowable temperature on an objective basis and permits the calculation of the corresponding critical inlet values fcr the operating variables, like partial pressure of the reactant, temperature of the reactor fluid, temperature of the cooling mediua, coolant flow rate, reactor throughput . . . . In addition to the rigorous treatment, a simple extrapolation procedure is presented, which proves to be very useful and accurate, provided the conditions are not too severe. KEY WORDS Parametric sensitivity; run-away; tubular reactor; pseudo homogeneous one-dimensicslal model. INTRCDUCTION Pioneering papers on parametric sensitivity and runaway in fixed bed catalytic reactors for strongly exothervnic reactians were published by Bilous and Amundson

( 1956) and by Barkelew (1959).

Iater work deelt with the derivation of criteria for safe operation for various reactor