EFFECT OF MASS TRANSFER ON THE SELECTIVITY OF (m, n)-(p, q) ORDER CONSECUTIVE GAS-LIQUID REACTIONS

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Theoretical analysis of the selectivity of (m, n)-(p, q) order consecutive gas-liquid reaction is developed based on the film theory. The reaction scheme discussed is as follows: B(l)+A(g)→R(l), rate = k1AmBn ; R(l) + A(g)→S(l), rate = k2APRq. The relations between the yield of an intermediate product R and the conversion of B are numerically calculated for a continuous stirred-tank reactor, and it is shown that Hikita and Asai''s approximate method is satisfactorily extended to this consecutive reaction system. The yield-conversion relations for (m, n) - (m, q) order reaction (i.e. m = p) are closely approximated by those of (1, n) - (1, q) order reaction using a given generalized parameter h1 which corresponds to the Thiele modulus in solid-catalysed gas-phase reactions. In the case of m→p, the effect of diffusion appears even in the slow reaction regime, whereas in the case of m → p, diffusion limitation influences the yield only when the reaction in the liquid film is predominant. The reaction factor for (m, n) - (p, q) order reaction is approximated by that for (1, n) - (1, q) order reaction.
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