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Title: Kinetics on cocondensation between phenol and urea through formaldehyde II

Author: Yoshida, Yasunori; Tomita, Bunchiro; Hse, Chung-Yun;

Date: 1995

Source: Mokuzai Gakkaishi 41(6):555-560

Publication Series: Miscellaneous Publication

Description: 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=ko/kp) 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.

Keywords: Cocondensation/urea/methylolphenol, 2, 4, 6-trimethylolphenol, kinetics, reactivity ratio, catalyst

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

 


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