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:
Dec. 15, 1998
Filed:
Oct. 29, 1997
Applicant:
Inventors:
Fu-Ming Lee, Katy, TX (US);
Joseph C Gentry, Houston, TX (US);
Randi Wright Wytcherley, Belgrade, MT (US);
Assignee:
HFM International, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ; B01D / ;
U.S. Cl.
CPC ...
585833 ; 585806 ; 585807 ; 585808 ; 585857 ; 585862 ; 585863 ; 585860 ; 585864 ; 585868 ; 585866 ; 585834 ; 203 53 ; 203 58 ; 203 60 ; 203 92 ; 203 90 ;
Abstract
An extractive distillation process for separating at least one substituted unsaturated aromatic from a pyrolysis gasoline mixture, containing said aromatic and at least one close-boiling aromatic or non-aromatic hydrocarbon, employing a two part extractive solvent, the first part selected from propylene carbonate, sulfolane (tetramethylene sulfone), methyl carbitol, 1-methyl-2-pyrrolidinone, 2-pyrrolidinone and mixtures thereof, and the second portion consisting of water.