US4134965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Caustic washed molecular sieves
Assignee: Merck and Co Inc
•
Filing: 1977-08-31
•
Granted: 1979-01-16
•
Expires: 1997-08-31
Abstract
Abstract A novel improved molecular sieve is prepared by a caustic wash process. The sieves so prepared show improved properties in reactions involving e.g., superior acid scavenging ability.
Inventors
- 👤 Alan J. Rein
- 👤 David D. Saperstein
- 👤 Seemon H. Pines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:44
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/026; Y; Y10; Y10S; Y10S423/00; Y10S423/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
The process for preparing caustic washed molecular sieves of type 3A or 4A of improved acid scavenging ability, which comprises slurrying the sieves with the appropriate aqueous 0.10-0.5N caustic solution, heating for 1/4-1 hour at 70°-100° C., filtering, washing until the pH of the wash water is 10-11 and drying to a loss on ignition value of between 2-8%.
Claim 2
Dependent Claim
59 words
The process for preparing caustic washed molecular sieves of type 3A or 4A of improved acid scavenging ability, which comprises slurrying the sieves with the appropriate aqueous 0.10-0.5N caustic solution, heating for 1/4-1 hour at 70°-100° C., filtering, washing until the pH of the wash water is 10-11 and drying to a loss on ignition value of between 2-8%.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |