Apparatus for the separation of p-xylene in C.sub.8 aromatic hyd

Details Apparatus for the separation of p-xylene in C.sub.8 aromatic hyd Apparatus for the separation of p-xylene in C.sub.8 aromatic hyd

1993-10-27

1995-03-28

Santiago, Amalia L.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including solid, extended surface, fluid contact reaction...

422256, 422261, 422281, B01J 802

Patent

active

054014760

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 of 1.2 to 2.5; (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.

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 et al.
patent: 4402832 (1983-09-01), Gerhold
patent: 4498991 (1985-02-01), Oroskar

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