Removal of lead from organic diaryl carbonate reaction mixtures

Details Removal of lead from organic diaryl carbonate reaction mixtures Removal of lead from organic diaryl carbonate reaction mixtures

1998-12-22

2000-07-18

Dunn, Tom

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

210758, 210912, 423619, C07C 6996, C02F 172, C01G 2102, B01J 2034

Patent

active

060907371

ABSTRACT:
A method for efficient removal of lead co-catalyst species from organic process streams arising from diaryl carbonate synthesis, by contacting the organic reaction mixtures with an aqueous acid, salt, or acid/salt solution, thereby extracting the treated mixture into an aqueous phase, or by treating the organic reaction mixtures with solid oxalic acid or oxalic acid salt, or an aqueous solution of oxalic acid or oxalic acid salt, thereby resulting in precipitation of the lead. The precipitated lead may then be calcined to provide a lead compound that is catalytically active in the carbonylation of phenol to yield diary carbonates. Use of these methods will substantially reduce both financial and environmental concerns for the preparation of diaryl carbonates.

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