Patent Number: 6,310,232

Title: Method for recycle of bromide-containing catalyst constituents

Abstract: Bromide source such as alkali metal bromide, alkaline earth metal bromide, or onium bromide, present as part of a catalyst mixture in an organic oxidative carbonylation mixture further comprising diaryl carbonate and a hydroxyaromatic compound, is often at least partially converted to organic bromide such as bromophenols. The bromide source can be recycled after reaction through treatment with an aqueous acidic bromide solution such as hydrogen bromide, preferably after removal of a major proportion of hydroxyaromatic compound such as phenol.

Inventors: Ofori; John Yaw (Niskayuna, NY), Pressman; Eric James (East Greenbush, NY), Patel; Ben Purushotam (Niskayuna, NY), Moreno; Phillip Oscar (Eugene, OR), Battista; Richard Anthony (Dalton, MA)

Assignee: General Electric Company

International Classification: C07C 68/08 (20060101); C07C 68/00 (20060101); C07C 069/96 (); C07C 277/00 (); C07C 279/00 (); C07F 009/02 ()

Expiration Date: 10/30/2018