US Patent 7161027 Process for the oxidative purification of terephthalic acid

Patent 7161027 was granted and assigned to Eastman Chemical Company on January, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Eastman Chemical Company

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7161027

Date of Patent

January 9, 2007

Patent Application Number

10645734

Date Filed

August 21, 2003

Patent Primary Examiner

‌

Cecilia J. Tsang

Patent abstract

Disclosed is a process to produce a purified carboxylic acid slurry. The process comprises removing impurities from a crystallized product in a solid liquid displacement zone to form the purified carboxylic acid slurry. The purified carboxylic acid slurry is further cooled in a cooling zone and subsequently filtered and dried in a filtration and drying zone. The process produces purified carboxylic acid product having good color and low impurity levels without the use of purification steps like hydrogenation or filtrate purge.