Thermohydrolytic treatment of chips from UFbonded particleboards using the flask method technique at temperatures of about 103°C resulted in a notable increase in the pH-value of aqueous absorption medium after a reaction period of 24 h, most likely due to degradation of the UF-resin. This leads to neutralisation of the stronger formic acid to a much higher extent than acetic acid. Accordingly, the release of formic acid using the flask technique decreases to a much higher extent compared to that of acetic acid under the same conditions. The release of acetic acid could also be enhanced by possible deacetylation of the wood material induced by the hardener usually present in recovered UF-boards. This indicates that inextricably intertwined reactions unfold on hydrothermic degradation of UF-bonded particleboards.
Chemische Wechselwirkungen bei dem thermohydrolytischen Abbau von UF-Harzen in RecyclingplattenZusammenfassung Die thermohydrolytische Behandlung von UF-Holzspanplatten bei 103°C unter Verwendung des Flaschenverfahrens führt nach einer Reaktionsdauer von 24 h zu einer deutlichen Erhöhung des pH-Wertes. Dies äu-ßert sich in einer stärkeren Neutralisation von Ameisensäure im Vergleich zu Essigsäure. Entsprechend wird die Abgabemenge von freier Ameisensäure aus den Recyclingplatten E. Roffael ( ) Georg-August
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