Formaldehyde → HCID 131710685, compound

Participants

Reaction Conditions

Reaction Steps

220g of p-nonyl phenol, 50 g of aqueous (30%) formaldehyde and 50 g of (90%) paraformaldehyde are dissolved or suspended accompanied by stirring at 40° C and over a period of half an hour 80 g of 33% caustic soda solution are added. The temperature rises to 60° C. This temperature is maintained initially by cooling then later by heating, until the free formaldehyde content drops to 1.8 - 2%, which takes 4-5 hours. 75g of xylene are then added, followed by cooling to 40° C and the pH is adjusted to 8.0 to 7.5 with about 105 g of 60% sulphuric acid. The temperature must be held at 40° C by cooling. Subsequently the pH is adjusted to from 6.4 to 6.6 with 2 to 3 g of 50% phosphoric acid. The solution is left to settle, separated and discarded. The dimethylol nonyl phenol solution, after adding xylene as the entraining agent, is freed of water by circulation distillation as described in Examples 1-4 under reduced pressure and at a tank temperature of 50°- 60° C. Inorganic salts are removed by subsequent filtration. 390 g of the solution are obtained.

Provenance & Evidence