Kinetics on cocondensation between phenol and urea through formaldehyde III

Abstract

Concurrent reactions involving cocondensation and self-codensation were determined simultaneously in the reactions of o- and p-methylolphenol, respectively, with urea. The results were as follows: (1) The reactivity ratio of self-condensation to cocondensation could be determined by Equation [4] for the concurrent reaction of monomethylolphenol with urea. (2) For the reaction of o-methylolphenol with urea in water, it was found that the second-order rate constant of the self-condensation due to the formation of a o,p-methylene linkage is approximately ten times greater than that of the cocondensation between o-methylolphenols with urea. The reaction solvent of the mixture of water and dioxane reduced the reactivity ratio. (3) For the reaction of p-methylolphenol with urea under water/dioxane solvent, it was suggested that the rate constant of the cocondensation is approximately four times greater than that of the self-condensation between p-methylolphenols.

Citation

Yoshida, Yasunori; Tomita, Bunchiro; Hse, Chung-Yun. 1995. Kinetics on cocondensation between phenol and urea through formaldehyde III. Mokuzai Gakkaishi 41(7):652-658