Process for the preparation of phenyl carbonates or polycarbonat

Details Process for the preparation of phenyl carbonates or polycarbonat Process for the preparation of phenyl carbonates or polycarbonat

1990-09-04

1994-01-04

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having a halogen atom or oxygen single bonded...

526 67, 526 68, 528196, 528271, 528370, C08G 6438

Patent

active

052761347

ABSTRACT:
A process for the preparation of an aromatic carbonate or polycarbonate from a phenol or bisphenol, methanol, carbon monoxide and oxygen comprising the steps of 1) reacting phenol or bisphenol with acetic anhydride to form (bis)phenyl acetate; 2) reacting dimethyl carbonate with (bis)phenyl acetate from step 1 to produce a phenyl carbonate or polycarbonate and methyl acetate; and 3) reacting the methyl acetate with carbon monoxide to produce acetic anhydride for use in step 1. In a desirable embodiment the dimethyl carbonate may also be prepared by reaction of methanol, carbon monoxide and oxygen.

REFERENCES:
patent: 4333885 (1982-06-01), Feitler
patent: 4954613 (1990-09-01), Hudson

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