Formaldehyde → Resorcinol-formaldehyde resin
Reaction equation
O.[C:2]1([CH:9]=[CH:8][CH:7]=[C:5]([OH:6])[CH:4]=1)[OH:3].C=O>C1(C)C=CC(S(O)(=O)=O)=CC=1.O.N.C1(C)C=CC=CC=1>[C:2]1([CH:9]=[CH:8][CH:7]=[C:5]([OH:6])[CH:4]=1)[OH:3].[CH2:2]=[O:3]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 3
Conditions
- Temperature
- 122.5 °C
Procedure
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).
Workup
- dissolutionthe whole dissolved at 50° C.
- additionafter the completion of the dropwise addition
- customa reaction
- temperatureAfter the temperature of the reaction system was cooled to room temperature
- extractionfollowed by extraction
- extractionThe extraction step
- addition524 g of water was charged
- distillationAfter azeotropic distillation
- temperaturethe residue was cooled
Sources & evidence
- ORD record
- ord-e641c278b309464fa9c18431fc519631
- Source dataset
- uspto-grants-2010_11
- Patent number
- US07834124B2
Reaction notes
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