Reclamation of metal catalysts used in the production of diaryl carbonates
AssigneeGeneral Electric Company
InventorJohn Yaw Ofori
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Abstract
A method for efficient reclamation of metal catalyst species from aqueous extract streams diaryl cabonate synthesis, comprising treating a metal-containing aqueous extract stream of a mixture from the production of diaryl carbonates with a precipitating agent effective to selective precipitate one or more metal catalyst species from the extract. Use of these methods substantially reduces both financial and environmental concerns for the preparation of diaryl carbonates.
Claims12
A method for reclaiming metal catalyst species from a metal-containing aqueous extract stream from diaryl carbonate production mixtures, said method comprising
- treating a metal-containing aqueous extract stream of a mixture from the production of diaryl carbonate with a first portion of a precipitating agent effective to precipitate at least one first metal catalyst species from the extract stream.
A method for reclaiming metal catalyst species from a metal-containing aqueous extract stream from diaryl carbonate production mixtures, said method comprising the steps of:
- adding a first portion of sodium acetylacetonate to a metal-containing aqueous extract stream of a mixture from the production of diaryl carbonate to precipitate at least one first metal catalyst species from the extract stream;
- separating the at least one first metal catalyst species from the extract stream;
- and
- adding a second portion of sodium acetylacetonate to the extract stream to precipitate at least one second metal catalyst species from the extract stream.
Dependencies are inferred from the claim text.