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:
Apr. 29, 2014
Filed:
Sep. 23, 2010
Scott Donald Barnicki, Kingsport, TN (US);
Stephen Neal Falling, Kingsport, TN (US);
Jeffrey Scott Kanel, Kingsport, TN (US);
Robert Sterling Kline, Kingsport, TN (US);
Peter Borden Mackenzie, Kingsport, TN (US);
Scott Donald Barnicki, Kingsport, TN (US);
Stephen Neal Falling, Kingsport, TN (US);
Jeffrey Scott Kanel, Kingsport, TN (US);
Robert Sterling Kline, Kingsport, TN (US);
Peter Borden Mackenzie, Kingsport, TN (US);
Eastman Chemical Company, Kingsport, TN (US);
Abstract
Disclosed is a process for the extractive recovery of an acid catalyst from an aqueous mixture of glycolic acid with an extraction solvent comprising a tertiary amine or an onium carboxylate compound, a modifier, and a diluent. The acid catalyst, which can comprise strong acids such as sulfuric acid, alkyl sulfonic acids, and fluoroalkyl sulfonic acids, can be recovered by back extraction with aqueous formaldehyde and recycled to a process for the preparation of glycolic acid by the acid-catalyzed carbonylation of formaldehyde.