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:
Mar. 19, 2002
Filed:
Aug. 25, 1999
Gérard Hotier, Rueil Malmaison, FR;
Larry Mank, Orgeval, FR;
Françoise Montecot, Les Clayes sous Bois, FR;
Institut Francais du Petrole, Rueil Malmaison Cedex, FR;
Abstract
For co-production of metaxylene and paraxylene from a feedstock (line- ) of hydrocarbons, there is employed a simulated moving bed chromatographic column having at least five zones and which delivers an extract, a raffinate and an intermediate raffinate. The feedstock has an ethylbenzene content of less than 5% by weight, and the chromatographic column comprises at least twenty-five beds, of which at least five beds are in zone B. The raffinate is distilled ( ) to recover the metaxylene at a purity of at least 99% and orthoxylene. The extract is distilled ( ) to recover the paraxylene at a purity of at least 99.6%. The recovered isomers can be synthesized into isophthalic acid and terephthalic acid.