Sabic Innovative Plastics IP B.v.

Kwang Woong Won

Robert Edgar Colborn

David Bruce Hall

Thomas Wessel

Prashant Anil Tatake

Peter Koch

John E Pace

Shyamal Bhaskar Gondkar

Bernd Volker Demuth

Karl E Mack

Utpal Mahendra Vakil

Uptal Mahendra Vakil

KarlErnst Mack

A method of preparing a halophthalic acid is disclosed which comprises the steps of contacting in a liquid phase reaction mixture at least one halogen-substituted ortho-xylene with oxygen and acetic acid at a temperature in a range between about 120&#xb0; C. and about 220&#xb0; C. in the presence of a catalyst system yielding a product mixture comprising less than 10 percent halogen-substituted ortho-xylene starting material, a halophthalic acid product, and less than about 10,000 ppm halobenzoic acid and less than about 1000 ppm halophthalide by-products based on a total amount of halophthalic acid present in the product mixture. In addition methods for the preparation of halophthalic anhydride, and recovery of high purity acetic acid from an aqueous acetic acid stream comprising HCl, which is generated during the preparation of the halophthalic acid are also disclosed.

Method of making halophthalic acids and halophthalic anhydrides

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San Clemente, CA, United States of America

Kwang Woong Won