Abstract This application broadly discloses a process for the separation of para-aromatics isomer from a feed mixture containing para- and at least one other aromatic isomer. The process utilizes a crystalline aluminosilicate adsorbent containing barium cations base-exchanged upon the zeolite. The zeolite also contains a predetermined quantity of water upon the adsorbent. The process can be performed in batch fixed-bed processes, moving bed processing sequences or fixed-bed simulated moving bed countercurrent flow process. Separation takes place in either liquid or vapor operations using isothermal, isobaric or both operating conditions. The specific disclosure of this application relates to the use of a particular adsorbent to separate para-xylene from xylene mixtures which adsorbent is of a type X or type Y crystalline structured aluminosilicate containing barium cations and water within the zeolite.
Inventors
👤 R Neuzil
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 22:44
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
The process of claim 1 further restricted in that said feed is selected from the group consisting of C8 aromatic isomers, C9 aromatic isomers, C10 aromatic isomers and C11 aromatic isomers.
Claim 2
Dependent Claim
27 words
The process of claim 1 further restricted in that said zeolite contains barium cations at over about 75 percent of the base exchangeable sites within the zeolite.
Claim 3
Dependent Claim
36 words
The process of claim 1 further restricted in that said zeolite contains water in the range of from about 1 to about 3 weight percent of the zeolite as measured on a relative volatile free basis.
Claim 4
Dependent Claim
49 words
The process of claim 1 further restricted in that said zeolite contains barium cations at over about 75 percent of the base exchangeable sites and water in the range of from about 1 to about 3 weight percent of the zeolite as measured on a relative volatile free basis.
Claim 5
Dependent Claim
19 words
The process of claim 2 further restricted in that said C8 aromatic feed isomers are xylene isomers and ethylbenzene.
Claim 6
Dependent Claim
17 words
The process of claim 2 further restricted in that said C10 aromatic feed isomers are diethylbenzene isomers.
Claim 7
Dependent Claim
17 words
The process of claim 2 further restricted in that said C11 aromatic feed isomers are cymene isomers.