Patent · US Active

Method for producing paraxylene comprising an adsortion step and two isomerization steps

US7915471B2 · kind B2 · utility

24Cited by

8References

17Claims

0Family size

Assignee

IFP ENERGIES NOUVELLES · FR

Inventors

Philibert Leflaive · Rueil-Malmaison, FR
Luc Wolff · Chaponnay, FR
Gerard Hotier · Rueil-Malmaison, FR

Key dates

Filing date	Nov 23, 2004
Grant date	Mar 29, 2011
Priority date	—
Expiry date	May 29, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C7/13
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for producing para-xylene from a hydrocarbon feed is described in which an adsorption column operating as a simulated moving bed with at least five zones delivers an extract, a 2-raffinate and an intermediate raffinate.The extract is distilled and the distillate is optionally re-crystallized to recover para-xylene with a purity of at least 99.7%. The 2-raffinate is distilled then isomerized in a reactor preferably operating in the liquid phase and at a low temperature. The intermediate raffinate with an enriched ethylbenzene content is distilled then isomerized in the vapour phase.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.