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. 30, 2013
Filed:
Jun. 06, 2011
David P. Palmer, Katy, TX (US);
Steven D. Evitt, Somerville, MA (US);
Stephen W. Fetsko, Hingham, MA (US);
Chung-ming Chi, Needham, MA (US);
David P. Palmer, Katy, TX (US);
Steven D. Evitt, Somerville, MA (US);
Stephen W. Fetsko, Hingham, MA (US);
Chung-Ming Chi, Needham, MA (US);
Badger Licensing LLC, Cambridge, MA (US);
Abstract
In a method of recovering phenol and acetone from a feed stream containing bisphenol-A and isomers thereof, the feed stream is contacted with water and a source of hydroxyl ions under conditions effective to decompose at least part of said bisphenol-A and isomers thereof to phenol and acetone. The conditions include a temperature of about 150° C. to about 300° C., a pressure sufficient to keep the water substantially in the liquid phase at said temperature, and a molar ratio of hydroxyl ions to hydroxyphenyl groups in the residue stream from about 0.3:1 to about 0.9:1.