Seven prepolymers of phenol resin were decomposed into their monomers such as phenol, cresols,
and p-isopropylphenol by reactions at 523−703 K under an Ar atmosphere in subcritical and
supercritical water. The total yield of identified products depended on the kind of prepolymers,
and the maximum yield reached 78% in the reaction at 703 K for 0.5 h. The decomposition
reactions were accelerated by the addition of Na2CO3, and the yields of identified monomers
reached more than 90%. Two kinds of molding materials of phenol resin whose content of phenol
resin was less than 50% were also decomposed mainly into phenol and cresols by the reaction
in supercritical water.
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