Method for recycle of bromide-containing catalyst constituents
AssigneeGeneral Electric Company
InventorsJohn Yaw Ofori, Eric James Pressman, Ben Purushotam Patel, Phillip Oscar Moreno, Richard Anthony Battista
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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.
Claims21
A method for removal and recycle of ionic bromide-containing catalytic materials from a composition comprising a substantially water-insoluble organic material and a bromide source, which comprises the steps of contacting said composition with an aqueous acidic solution comprising bromide ions, thereby regenerating said bromide source, and extracting said bromide source with an aqueous liquid.
A method for removal and recycle of sodium bromide, tetraalkylammonium bromide, or hexaalkylguanidinium bromide from a composition comprising said sodium bromide, tetraalkylammonium bromide, or hexaalkylguanidinium bromide, diphenyl carbonate, and phenol, which comprises contacting said composition with an aqueous hydrogen bromide solution, thereby regenerating said sodium bromide, tetraalkylammonium bromide, or hexaalkylguanidinium bromide, and extracting said bromide source with water.
Dependencies are inferred from the claim text.