反应详情

温度

122.5 °C

After 280 g of water and 523.6 g of resorcinol were placed in a 2 L flask made of glass and the whole dissolved at 50° C., 1.2 g of p-toluenesulfonic acid was charged into the reaction vessel. While the reaction system was maintained at 120 to 125° C., 224 g of 37% formalin was added dropwise over a period of 300 minutes and, after the completion of the dropwise addition, the mixture was further stirred for 60 minutes to cause a reaction to proceed. After the temperature of the reaction system was cooled to room temperature, 792 mL of toluene was added to a neutralized solution neutralized with 0.7 g of 25% ammonia water, followed by extraction. The extraction step was repeated twice and 524 g of water was charged. After azeotropic distillation, the residue was cooled to obtain 893 g of a resorcinol-formalin resin (content of resorcinol: about 14%, solid content: 500 g).

1. dissolutionthe whole dissolved at 50° C.
2. additionafter the completion of the dropwise addition
3. customa reaction
4. temperatureAfter the temperature of the reaction system was cooled to room temperature
5. extractionfollowed by extraction
6. extractionThe extraction step
7. addition524 g of water was charged
8. distillationAfter azeotropic distillation
9. temperaturethe residue was cooled