Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By plural serial diverse separations
Patent
1997-09-23
1999-05-18
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By plural serial diverse separations
585818, 585819, C07C7/144;7/04
Patent
active
059051825
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.
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Prevost Isabelle
Streicher Christian
Griffin Walter D.
Institut Francais du Pe'trole
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