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:
May. 18, 1999
Filed:
Sep. 23, 1997
Christian Streicher, Rueil Malmaison, FR;
Isabelle Prevost, Rueil Malmaison, FR;
Institut Francais Du Petrole, , FR;
Abstract
A mixture that contains benzene, other aromatic hydrocarbons and paraffinic hydrocarbons and/or naphthenic hydrocarbons that have 5 to 10 carbon atoms undergoes distillation in a first column, producing a distillate and a residue; a phase is drawn off laterally from the first distillation column, preferably at a point on the column where the benzene content is essentially at maximum where the toluene content is low; the phase that is drawn off is sent toward a first permeation stage, which produces a permeate that is enriched with benzene and a retentate; at least a portion of said retentate is recycled toward said first distillation column; the benzene-enriched permeate from stage (3) is sent to a second distillation column, from which the purified benzene comes out at the bottom and a distillate vapor comes out at the top; the distillate vapor is condensed, and the condensed distillate is sent at least in part to a second permeation stage; in said second permeation stage, a permeate that is also enriched in benzene and a retentate are separated; the permeate is recycled to the second distillation column; and the retentate is recycled toward the inlet of the first permeation stage or directly toward the first distillation column.