Hydrochloric Acid → Resorcinol-formaldehyde resin

Participants

Reaction Conditions

Reaction Steps

After 133 kg of water, 85 kg of calcium chloride, and 111 kg of resorcinol were placed in a 500 L acid-resistant reaction vessel and dissolved at 50° C., 45 kg of methyl ethyl ketone and 0.45 kg of 35% hydrochloric acid were charged into the reaction vessel. While the reaction system was maintained at 50° C., 53 kg of 37% formalin was added dropwise over a period of 30 minutes and, after the completion of the dropwise addition, the mixture was further stirred for 30 minutes to cause a liquid-liquid heterogeneous reaction to proceed. While maintaining the temperature of the reaction system, it was allowed to stand and separate into two layers, and then an underlying aqueous phase was drawn off. The organic phase was diluted with 200 kg of methyl ethyl ketone and then 100 kg of water was added thereto. Furthermore, while maintaining the same temperature, the reaction system was stirred for 30 minutes and, after allowing to stand, separated into two layers and then the aqueous layer was drawn off to obtain a methyl ethyl ketone solution of a resorcinol-formalin resin.

Provenance & Evidence