Hydrochloric Acid → Diphenyl carbonate

Participants

Reaction Steps

To 3,000 g of a 20% aqueous solution of sodium hydroxide (15 mol of sodium hydroxide) were added 1,000 g (10.6 mol) of phenol, 10.7 g (0.106 mol) of triethylamine, and 5 L (L=liter) of methylene chloride and 660 g (6.7 mol) of phosgene was blown into the mixture to react. When the reaction was over, 100 ml of 30% hydrochloric acid was added to wash the mixture, and the organic phase was separated. Subsequently, after washing with 3.5 L of water, the organic phase was separated, and methylene chloride phase was removed to obtain crude diphenylcarbonate A, which was vacuum-distilled to obtain Diphenylcarbonate A. The chlorine content in Diphenylcarbonate A derived from chloroformate group was 3,000 ppm.

Provenance & Evidence