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  1. Kinetics on cocondensation between phenol and urea through formaldehyde III

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    Author(s): Yasunori Yoshida; Bunichiro Tomita; Chung-Yun Hse
    Date: 1995
    Source: Mokuzai Gakkaiski, Vol. 41(7): 652-658
    Publication Series: Miscellaneous Publication
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    Description

    Concurrent reactions involving cocondensation and self-codensation were determined simultaneously in the reactions of o- and p-methylophenol, respectively, with urea. The results were as follow:
    (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 ractivity ratio.
    (3) For the reaction of p-methylolphenol with urea using a 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.

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    Citation

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

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