Separation of impurities and/or valuable substances from...

Details Separation of impurities and/or valuable substances from... Separation of impurities and/or valuable substances from...

2005-07-05

2005-07-05

Saeed, Kamal (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

Reexamination Certificate

active

06914149

ABSTRACT:
A process for the separation a substantially adduct-free diaryl carbonate from reaction solution is disclosed. The process entails obtaining a solution that contains diaryl carbonate, catalyst system components and an aromatic solvent, lowering the temperature of the solution, optionally in the presence of a nucleating agent, to produce a crystallization product, and washing the crystallization product with an anhydrous wash solution to remove catalyst residues and impurities.

REFERENCES:
patent: 5239106 (1993-08-01), Shafer
patent: 5495038 (1996-02-01), Buysch et al.

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