Metal salts of aromatic carboxylic acids

Summary qf kinetic results for the decomposition of metal salts of aromatic carboxylic acids [88,460,1109,1110] 

Most processes were deceleratory throughout, fitting a rate equation based on the reaction order eqns. (15)—(17). ( indicates a nucleation and growth reaction.) 

B = Basic salt M = melting. Results expressed as (order) activation energy/kJ mole-1 (temperature range/K) 

Several reactions proceed to completion in two stages, shown bracketed.  

Sigmoid curves, attributable to nucleation and growth reactions, were observed for the decompositions of cobalt phthalate and silver mellitate these are marked in Table 16. The decomposition of nickel terephthalate [88] obeys the Avrami—Erofe ev equation [eqn. (6)], for which n is 1.0— 1.5 and E = 226 8 kJ mole-1. Decompositions of Co—Ni mixed mellitates are discussed in Sect. 7. 

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