KINETICS ON COCONDENSATION BETWEEN PHENOL AND UREA THROUGH FORMALDEHYDE .2. CONCURRENT COCONDENSATIONS OF 2,4,6-TRIMETHYLOLPHENOL WITH UREA

The chemical kinetics of the concurrent reactions of 2,4,6-trimethylol phenol with urea, where o(-) and p(-)methylol groups reacted simultane ously with urea, were analyzed on four kinds of catalysts: namely, sul furic acid, hydrochloric acid, nitric acid, and oxalic acid. The resul ts were summarized as follows: (1) Assuming that each reaction follows the second-order reaction, the reactivity ratio (K=k(o)/k(p)) of the o(-) to p(-)methylol group could be obtained from the kinetic plots of Equation [5] within small errors. (2) The reactivity ratios were dete rmined to be 0.066 to 0.075 by the least-square method for four kinds of acid catalysts. (3) The reactivity ratio of the pseudo-first-order rate constants obtained by competitive cocondensations under the coexi stence of o(-) and p(-)methylolphenols with a sulfuric acid catalyst w as found to be almost identical with that obtained by the concurrent c ocondensation of the trimethylolphenol.