Kinetics on cocondensation between phenol and urea through formaldehyde II

Abstract

The chemical kinetics of the concurrent reactions of 2,4,6-trimethylolphenol with urea, where o- and p-methylol groups reacted simultaneously with urea, were analyzed on four kinds of catalysts: namely, sulfuric acid, hydrochloric acid, nitric acid, and oxalic acid. The results 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 determined 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 coexistence of o- and p-methylolphenols with a sulfuric acid catalyst was found to be almost identical with that obtained by the concurrent cocondensation of the trimethylolphenol.

Citation

Yoshida, Yasunori; Tomita, Bunchiro; Hse, Chung-Yun. 1995. Kinetics on cocondensation between phenol and urea through formaldehyde II. Mokuzai Gakkaishi 41(6):555-560