Binderless zeolitic adsorbents, methods for producing binderless zeolitic adsorbents, and adsorptive separation processes using the binderless zeolitic adsorbents
AssigneeUop LLC
InventorsJack E. Hurst, Linda S. Cheng
Life of this patent
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Abstract
Binderless BaKX zeolitic adsorbents, methods for their production, and adsorptive separation using the adsorbents are provided. An adsorbent comprises a first Zeolite X having a silica to alumina molar ratio of from about 2.0 to about 3.0; a binder-converted Zeolite X wherein a ratio of the binder-converted Zeolite X to the first Zeolite X ranges from about 10:90 to about 20:80 by weight; and barium and potassium at cationic exchangeable sites within the binderless BaKX zeolitic adsorbent. Potassium ranges from about 0.9 wt % to about 1.5 wt % and barium ranges from about 30 wt % to about 34 wt % of the binderless BaKX zeolitic adsorbent.
Claims21
A binderless BaKX zeolitic adsorbent comprising:
- a first Zeolite X having a silica to alumina molar ratio of from about 2.0 to about 3.0;
- a binder-converted Zeolite X wherein a ratio of the binder-converted Zeolite X to the first Zeolite X ranges from about 10:90 to about 20:80 by weight;
- and
- barium and potassium at cationic exchangeable sites within the binderless BaKX zeolitic adsorbent;
- wherein potassium ranges from about 0.9 wt % to about 1.5 wt % of the binderless BaKX zeolitic adsorbent, and barium ranges from about 30 wt % to about 34 wt % of the binderless BaKX zeolitic adsorbent.
A method for producing a binderless BaKX zeolitic adsorbent comprising:
- forming agglomerates having ion-exchangeable sites, the agglomerates formed from Zeolite X having a silica to alumina molar ratio of from about 2.0 to about 3.0, a kaolin clay binder, and carboxymethyl cellulose;
- activating the agglomerates to convert the kaolin clay binder to meta-kaolin clay binder;
- dissipating the carboxymethyl cellulose;
- converting the meta-kaolin clay binder into binder-converted Zeolite X;
- exchanging the ion-exchangeable sites with barium and potassium to provide the binderless BaKX zeolitic adsorbent having potassium in an amount ranging from about 0.9 wt % to about 1.5 wt % of the binderless BaKX zeolitic adsorbent, and barium in an amount ranging from about 30 wt % to about 34 wt % of the binderless BaKX zeolitic adsorbent;
- and
- drying the binderless BaKX zeolitic adsorbent.
An adsorptive separation process for separating para-xylene from a feed mixture comprising at least one other C8 aromatic isomer, the process comprising:
- contacting the feed mixture with a binderless BaKX zeolitic adsorbent comprised of a first Zeolite X portion having a silica to alumina molar ratio of from about 2.0 to about 3.0;
- a binder-converted Zeolite X portion;
- and barium and potassium at cationic exchangeable sites within the binderless BaKX zeolitic adsorbent, wherein potassium ranges from about 0.9 wt % to about 1.5 wt % of the binderless BaKX zeolitic adsorbent, and barium ranges from about 30 wt % to about 34 wt % of the binderless BaKX zeolitic adsorbent;
- causing para-xylene to be adsorbed on the binderless BaKX zeolitic adsorbent;
- removing a less selectively adsorbed portion of the feed mixture from contact with the binderless BaKX zeolitic adsorbent as a raffinate stream;
- and
- recovering the para-xylene from the binderless BaKX zeolitic adsorbent by desorption with a desorbent.
Dependencies are inferred from the claim text.