Method for manufacturing an adsorbent useful for olefin separation
AssigneeUop LLC
InventorsDonald H. Rosback, Richard W. Neuzil
Life of this patent
Estimating the term…
Abstract
A method for the production of an adsorbent, having increased capacity for olefins and decreased catalytic activity for polymerization and isomerization, useful in the separation of olefins from a hydrocarbon mixture comprising olefins and paraffins. The methods basically comprises contacting a precursor mass comprising sodium X or sodium Y zeolite and amorphous material selected from the group consisting of silica, alumina and silica-alumina mixtures and compounds as a binder with an aqueous sodium hydroxide solution to increase the sodium cation content of the zeolite and to remove a small portion of silica and alumina; washing the zeolite with water to remove excess caustic solution; and, drying the zeolite to reduce the volatile content.
Claims8
A method for the production of improved adsorbent particles having increased capacity for olefins and decreased catalytic activity from a precursor mass comprising sodium Y zeolite having a Na.sub.2 O/Al.sub.2 O.sub.3 ratio less than about 0.7 and amorphous material selected from the group consisting of silica, alumina and slica-alumina mixtures and silica-alumina compounds which method comprises the steps of:
- a. contacting said precursor mass with an aqueous sodium hydroxide solution at ion exchange conditions to increase the sodium cation content to a Na.sub.2 O/Al.sub.2 O.sub.3 ratio of greater than about 0.7 and to remove from about 1 to about 15 wt. % silica and alumina from the precursor mass;
- b. washing said mass with water to remove therefrom excess sodium hydroxide;
- and,
- c. at least partially dehydrating said mass at dehydrating conditions.
An improved adsorbent having increased capacity for olefins and decreased catalytic activity produced by the steps of:
- a. contacting a precursor mass comprising sodium Y zeolite having a Na.sub.2 O/Al.sub.2 O.sub.3 ratio less than about 0.7 and amorphous material selected from the group consisting of silica and alumina and silica-alumina mixtures and compounds with an aqueous sodium hydroxide solution at ion exchange conditions to increase the sodium cation content to a Na.sub.2 O/Al.sub.2 O.sub.3 greater than about 0.7 and to remove from about 1 to about 15 wt. % of silica and alumina from the precursor mass;
- b. washing said mass with water to remove therefrom excess sodium hydroxide;
- and,
- c. at least partially dehydrating said mass at dehydrating conditions.
Dependencies are inferred from the claim text.