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:
May. 13, 2008
Filed:
Jun. 15, 2005
Michael A. Schultz, Chicago, IL (US);
Gregory F. Maher, Aurora, IL (US);
Michael A. Schultz, Chicago, IL (US);
Gregory F. Maher, Aurora, IL (US);
UOP LLC, Des Plaines, IL (US);
Abstract
In processes for recovering one or more xylene isomers and isomerizing the remaining isomers for recycle, the isomerate is distilled to provide a toluene-containing overhead, a mid-boiling fraction containing Caromatics and a bottoms fraction containing Caromatics and C+ aromatics. The mid-boiling fraction is recycled to the unit for recovering the sought xylene isomers and has sufficiently low content of C+ aromatics that the separation feed to the unit for recovering the sought xylene isomers contains up to about 500 ppm-mass C+ aromatics. The processes provide a high quality xylene isomer product while achieving at least one of debottlenecking, energy savings and capital savings.