The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 07, 2006
Filed:
Sep. 22, 2003
Charles Edwan Sumner, Jr., Kingsport, TN (US);
Philip Edward Gibson, Kingsport, TN (US);
Robert Lin, Kingsport, TN (US);
Eric Jackson Fugate, Gate City, VA (US);
Ernest William Arnold, Lake Wylie, SC (US);
Charles Edwan Sumner, Jr., Kingsport, TN (US);
Philip Edward Gibson, Kingsport, TN (US);
Robert Lin, Kingsport, TN (US);
Eric Jackson Fugate, Gate City, VA (US);
Ernest William Arnold, Lake Wylie, SC (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a crystallization zone to from a crystallized product. The crystallized product 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.