Patent Number: 7,732,559

Title: Method of making halophthalic acids and halophthalic anhydrides

Abstract: 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 C. and about 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.

Inventors: Colborn; Robert Edgar (Niskayuna, NY), Hall; David Bruce (Ballston Lake, NY), Koch; Peter Alois (Frankfurt, DE), Demuth; Bernd Volker (Offenbach, DE), Wessel; Thomas (Niederdorfelden, DE), Mack; Karl Ernst (Wiesbaden, DE), Tatake; Prashant Anil (Maharashtra, IN), Vakil; Uptal Mahendra (Maharashtra, IN), Gondkar; Shyamal Bhaskar (Karnataka, IN), Pace; John Edward (Washington, WV), Won; Kwang Woong (San Clemente, CA)

Assignee: Sabic Innovative Plastics IP B.V.

International Classification: C08G 73/00 (20060101)

Expiration Date: 2022-06-08 0:00:00