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:
Jan. 11, 2005
Filed:
Sep. 20, 2002
Philibert Leflaive, Bures sur Yvette, FR;
Luc Wolff, Lyons, FR;
Gérard Hotier, Rueil Malmaison, FR;
Alain Methivier, Marly le Roi, FR;
Philibert Leflaive, Bures sur Yvette, FR;
Luc Wolff, Lyons, FR;
Gérard Hotier, Rueil Malmaison, FR;
Alain Methivier, Marly le Roi, FR;
Institut Francais du Petrole, Rueil Malmaison Cedex, FR;
Abstract
A process for co-production of paraxylene, metaxylene and/or orthoxylene from a hydrocarbon feedstock () that comprises [1] a separation stage of the feedstock in a simulated moving bed in a chromatographic column () that contains a number of beds of an adsorbent, interconnected in a loop, is described, whereby said column comprises an injection () of the feedstock, a draw-off () of an extract that consists of paraxylene and desorbent, an intermediate fraction () (extract or raffinate) that contains ethylbenzene, and a raffinate () that contains a mixture of metaxylene and orthoxylene that is virtually free of ethylbenzene and paraxylene and [2] a crystallization stage () of the metaxylene and/or orthoxylene fraction. Upstream from the adsorption zone and/or upstream from the crystallization zone, it is possible to distill the entering mixture to produce an orthoxylene-enriched fraction at the bottom and a metaxylene-enriched fraction at the top.