Reaction Kinetics of Adiabatic Systems

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Abstract
Conventional kinetic measurements, based on isothermal reaction runs, have hitherto been used to evaluate the reaction parameters required for the description of a chemical rate process. These parameters are the order n of the reaction, its activation energy E, and its frequency factor X. A new technique is here proposed in which adiabatic reaction runs are employed. The temperature change is used to follow the reaction progress. The theory of the heat-effect of adiabatic reactions is deduced, and the mathematical working-up of adiabatic time-temperature data for the evaluation of n, E and X is set out on the basis of stated assumptions. A critical discussion of the method follows, and shows that it is of particular value in polymer chemistry and wherever viscous rubbery or solid reaction media are encountered. The difficulties of heat exchange associated with isothermal measurements are avoided. To what extent the proposed method may be complementary to the conventional in general appears as yet a matter of speculation.

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