US4477423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolite Y
Assignee: Ethicon Inc
•
Filing: 1983-04-28
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Granted: 1984-10-16
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Expires: 2003-04-28
Abstract
Abstract A zeolite Y having a relatively high or improved crystallinity is produced by making a water slurry of a zeolite Y having a relatively low or poor crystallinity, adding acid and bring the pH of the slurry to a range of about 7 to 12, refluxing the slurry until the desired crystallinity has been obtained, and then separating and drying the solids.
Inventors
- 👤 Robert N. Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:17
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/026; Y; Y10; Y10S; Y10S423/00; Y10S423/21
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A method of improving the crystallinity of zeolite Y, comprising the steps of, (a) making a water slurry of the zeolite Y to be treated; (b) adding a sufficient quantity of acid to adjust the pH of the zeolite Y-water slurry to about 7 to 8; (c) refluxing the slurry for a sufficient period of time to substantially increase the crystallinity of the zeolite Y; (d) separating the solids from the slurry; (e) drying the solids, and (f) recovering a zeolite Y product of improved crystallinity.
Claim 2
Independent Claim
86 words
A method of improving the crystallinity of zeolite Y, comprising the steps of, (a) making a water slurry of the zeolite Y to be treated; (b) adding a sufficient quantity of acid to adjust the pH of the zeolite Y-water slurry to about 7 to 8; (c) refluxing the slurry for a sufficient period of time to substantially increase the crystallinity of the zeolite Y; (d) separating the solids from the slurry; (e) drying the solids, and (f) recovering a zeolite Y product of improved crystallinity.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein the acid is hydrochloric acid.
Claim 4
Dependent Claim
17 words
The method of claim 1, wherein the refluxing is carried out for about 5 to 6 hours.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein separation of the solids is by filtration.
Claim 6
Dependent Claim
21 words
The method of claim 1, wherein in step (a), the pH of the zeolite Y-water slurry is about 11 or higher.
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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |