Process and apparatus for the separation of p-xylene in C.sub.8

Details Process and apparatus for the separation of p-xylene in C.sub.8 Process and apparatus for the separation of p-xylene in C.sub.8

1992-09-04

1994-02-08

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By plural serial diverse separations

585814, 585825, 585828, 585831, C07C 700, C07C 712, C07C 714

Patent

active

052849929

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 of the solvent to charge flow rates ob 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 si then recycled to the charge. The solvent for desorption in stage (1) and washing in stage (2) is advantageously toluene.

REFERENCES:
patent: 3813452 (1974-05-01), Bieser
patent: 3948758 (1976-04-01), Bonacci et al.
patent: 3959978 (1976-06-01), Lindley et al.
patent: 4118429 (1978-10-01), Fritsch
patent: 4402832 (1983-09-01), Gerhold
patent: 4498991 (1985-02-01), Oroskar
Patent Abstracts of Japan, vol. 5, No. 12 (C-40)(684) Jan. 24, 1981 and JP-A-55 139 327 (Nippon Kihatsuyu K.K.) Oct. 31, 1980.

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