Process for the separation of p-xylene in C.sub.8 aromatic hydro

Details Process for the separation of p-xylene in C.sub.8 aromatic hydro Process for the separation of p-xylene in C.sub.8 aromatic hydro

1996-12-06

1999-07-13

Griffin, Walter D.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

585478, 585805, 585812, 585814, C07C 522, C07C 714

Patent

active

059229241

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; (2) a stage of purifying and washing the low-purity p-xylene by recrystallization (-25 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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Patent Abstracts of Japan, vol. 5, No. 12 (C-40) (684) 24 Jan. 1981 and JP-A-55 139 327 (Nippon Kihatsuyu K.K.) Oct. 31, 1980.

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