Water → Bisphenol A

Participants

Reaction Steps

The reactor was charged with 90.7 kg of bisphenol A, methylene chloride and water in proportions to afford the listed solids percentages (i.e., percentage of product in the methylene chloride solution) and p-cumylphenol and triethylamine in proportions relative to bisphenol A similar to those in Examples 1-12. Just prior to phosgenation, the reactor was charged with 2.72 kg of 50% aqueous sodium hydroxide solution. Then phosgene was added at 68-136 kg/hr, and 50% aqueous sodium hydroxide solution was added to maintain the pH at 10.0. Phosgene was added at a substantially constant rate until 47.2 kg had been added. At a phosgene ratio of 0.5, the pH was increased to a value in the range of 10.8-11.2. This pH was maintained to a phosgene ratio of 0.8, whereupon the pH was returned to 10.0 for the duration of the phosgenation.

Provenance & Evidence