US4069172A
Expired / Lapsed
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Adsorbent for aromatic hydrocarbon mixture separation
Assignee: Toray Industries Inc
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Filing: 1976-03-15
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Granted: 1978-01-17
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Expires: 1996-03-15
Abstract
Abstract An adsorbent for separating para-isomers from C 8 or C 10 aromatic hydrocarbons, specifically, a faujasite zeolite wherein about 2.5 to 25 percent, based on the total exchangeable cation sites originally present within the faujasite zeolite, is decationized and metal ions at the residual cation sites are exchanged substantially with potassium and/or barium ions. The adsorbent is used in separating the para-isomer, which is isolated by desorbing from the adsorbent.
Inventors
- 👤 Masazumi Kanaoka
- 👤 Daisuke Ogawa
- 👤 Kazuyoshi Iwayama
- 👤 Makoto Kihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:25
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13; B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
An adsorbent for separating paraisomers from C 8 or C 10 aromatic hydrocarbons, or mixtures thereof, which is obtained by drying and calcining a faujasite zeolite including: (1) ammonium ions in the range of 2.5 to 25%, based on the total exchangeable cation sites originally present, and (2) ions selected from the group consisting of potassium and barium ions at the residual cation sites.
Claim 2
Dependent Claim
64 words
An adsorbent for separating paraisomers from C 8 or C 10 aromatic hydrocarbons, or mixtures thereof, which is obtained by drying and calcining a faujasite zeolite including: (1) ammonium ions in the range of 2.5 to 25%, based on the total exchangeable cation sites originally present, and (2) ions selected from the group consisting of potassium and barium ions at the residual cation sites.
Claim 3
Dependent Claim
21 words
The adsorbent according to claim 1, wherein said ammonium ions are present in the range of about 5 to 15 percent.
Claim 4
Dependent Claim
32 words
The adsorbent according to claim 1, wherein said initial faujasite zeolite contained substantial concentrations of sodium ions, and wherein the residual sodium content within said adsorbent is less than about 0.15 equivalent.
Claim 5
Dependent Claim
13 words
The adsorbent according to claim 1, wherein said para-isomer is para-xylene or para-diethylbenzene.
Claim 6
Dependent Claim
24 words
The adsorbent defined in claim 1, wherein said initial faujasite type zeolite is selected from the group consisting of X- and Y- type zeolites.
Claim 7
Dependent Claim
37 words
The adsorbent defined in claim 5, wherein said initial faujasite type zeolite contains oxides of sodium, aluminum and silica according to the formula 1.1 - 0.7 Na.sub.2 O : Al.sub.2 O.sub.3 : 2-7 SiO.sub.2 : XH.sub.2 O.
Claim 8
Dependent Claim
29 words
The adsorbent defined in claim 6, wherein said zeolite is molded into particles with a binder selected from the group consisting of bentonite, kaolin, alumina sol and silica sol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |