Abstract
The results of calorimetric measurements of the overall heat effects, specific heats, adiabatic temperature courses and thermokinetic data for the urea-formaldehyde reactions are presented. The measurements have been performed under near-industrial-process conditions with respect to temperature, reactant ratio and pH of the reaction medium. In the mildly alkaline pH region, the measurements have been performed in two steps showing the concentration dependence of the enthalpy changes. The resulting reaction mixtures had almost identical specific heats regardless of the initial amount of urea added. The specific heats of concentrated formaldehyde solutions determined at 324 K proved to be quite close ( ~ 5%) to the ideal mixture C p estimates.
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