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Correlations are developed to relate the critical feed temperature, corresponding to blow-off conditions, and the critical catalyst-bed entrance temperature to the operating and design parameters of autothermal reactors with internal countercurrent heat exchange. The proximity of the blow-off conditions to the optimum point of operation makes the correlation of the critical operating temperatures highly significant. Use is made of both irreversible and reversible first-order reactions. The capabilities of the correlations are illustrated with the water-gas shift reaction treated as pseudo first order.

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