Zeolitic adsorbent for xylene separation

Details Zeolitic adsorbent for xylene separation Zeolitic adsorbent for xylene separation

1975-01-24

1976-06-01

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

260674SA, 423112, B01J 2906, C07C 700

Patent

active

039607747

ABSTRACT:
A solid adsorbent useful for the separation of para-xylene from a mixture of C.sub.8 aromatic hydrocarbons. The adsorbent is prepared by the steps of: ion-exchanging a precursor mass containing type X or type Y zeolite and amorphous material with an aqueous sodium hydroxide solution to effect the addition of sodium cations to the zeolite structure, ionexchanging the sodium-exchanged mass to effect the essentially complete exchange of sodium cations, and drying the resulting material at conditions to reduce the LOI at 900.degree. C. to less than about 10 wt. %. The sodium cations can be essentially completely exchanged with barium and potassium cations in a weight ratio of from about 1.5 to 200 or with barium alone. I have found that the sodium hydroxide exchange step produces an adsorbent that has faster adsorption-desorption rates for the desired para-xylene isomer and permits a suitable adsorbent to be produced which contains barium cations alone.

REFERENCES:
patent: 3878127 (1975-04-01), Rosback

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