General Electric Company

Rudy Francois Alain J Peemans

Patrick Joseph McCloskey

Paul Michael Smigelski, Jr

Sheldon J Shafer

Timothy Brydon Burnell

Gaylord M Kissinger

Harish Radhakrishna Acharya

Eduard Hendricus Schlarmann

Juan Rodriques Ordonez

Gerardo Hidalgo-Llinas

Ignacia Vic Fernandez

Edward Venama

The invention is a catalytic ion exchange resin bed with low pressure drop, low catalyst breakage and low catalyst deactivation as well as an improved process for the production of bisphenol A employing such a catalytic ion exchange resin bed.

Combination ion exchange resin bed for the synthesis of bisphenol A

Acidic impurities in dihydroxyaromatic compounds such as bisphenol A, as illustrated by sulfonic acids and mercaptocarboxylic acids, can have an adverse effect on the molecular weight of a polycarbonate prepared therefrom by transesterification. The same is true of acidic impurities in diaryl carbonates such as diphenyl carbonate, as illustrated by salicylic acid and ferric chloride. The reagents are analyzed for these impurities. Based on the analysis, the reagents are discarded or recycled, or a compensatory amount of alkali metal hydroxide is employed as a catalyst in the reaction.

Optimization of polycarbonate preparation by transesterification

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Erps-Kwerps, Belgium

Rudy Francois Alain J Peemans