Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By plural serial diverse separations
Patent
1995-03-27
1997-05-13
Myers, Helane
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By plural serial diverse separations
585804, 585814, 585825, 585828, 585831, C07C 712
Patent
active
056294670
ABSTRACT:
To continuously produce and separate high purity p-xylene from a C.sub.8 aromatic hydrocarbon charge, successive use is made in combination of (1) a stage of separating low-purity p-xylene (75 to 98%) by simulated moving bed adsorption chromatography, with a ratio for the solvent to charge flow rates of 1.2 to 2.5; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25.degree. to +10.degree. C.); (3) a stage of catalytic isomerization of the charge which has been p-xylene-depleted by the separating stage (1); and recovering an isomerate which is then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.
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Hotier Gerard
Nguyen Thanh Than
Roux Guerraz Claude
Griffin Walter D.
Institut Francais du Pe'trole
Myers Helane
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