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. 23, 2002
Filed:
Jun. 22, 2000
Julia Magne-Drisch, Vilette de Vienne, FR;
Gérard Hotier, Rueil Malmaison, FR;
Alain Methivier, Orleans, FR;
Jean-Francois Joly, Lyons, FR;
Fabio Alario, Neuilly sur Seine, FR;
Elisabeth Merlen, Rueil Malmaison, FR;
Institut Francais du Petrole, , FR;
Abstract
A process for the production of at least one isomer of xylenes comprising a simulated moving-bed adsorption ( ) of a C8-aromatic feedstock ( ) that delivers a paraxylene-rich fraction ( ) that is optionally purified after a distillation ( ) by at least one high-temperature crystallization ( ) and a fraction ( ) that is low in paraxylene is described. Fraction ( ) is distilled and then isomerized ( ) in the presence of an EUO-structural-type catalyst. The lightest hydrocarbons are removed from the isomerization effluent in a first distillation ( ) then naphthenes in a second distillation ( ), and distilled isomerization effluent ( ) that results therefrom is recycled at least in part in adsorption ( ). A mother liquor ( ) that results from the crystallization stage is recycled at least in part in adsorption ( ).