The Dow Chemical Company

Harold D Myers

Hendrik E Tuinstra

A process for the preparation of a polycarbonate comprising reacting a diaryl carbonate with a bisphenol to produce a polycarbonate and a phenol, regenerating the diaryl carbonate by reacting the phenol byproduct with a carbonyl halide, and optionally recycling the hydrogen halide using a metal Redox captive halogen swing reactor system.

Process for the preparation of polycarbonates

Preparation of polycarbonates comprising separating bisphenol,

An integrated process for the production of dimethyl carbonate is disclosed. The processes utilizes oxygen and an inexpensive carbon source such as natural gas as reactants. Other reactants are generated within the process and used without isolation. The process produces dimethyl carbonate and water with other by-products being recycled.

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Midland, MI, United States of America

Harold D Myers