US3758667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of mordenite
Assignee: Individual
•
Filing: 1971-03-18
•
Granted: 1973-09-11
•
Expires: 1991-03-18
Abstract
Abstract High purity mordentie having a very small particle size is prepared at temperatures below 160* C by heating an aqueous mixture of amorphous silica-alumina having a silica/alumina molar ratio between 9.5 and 12.5 and one or more sodium compounds wherein at least 70 mol percent of the sodium, as Na2O, originates from sodium salts of polybasic acids having a pK value > 10 at 18* C for the highest dissociation step. The relation between the Na2O/Al2O3 molar ratio, m, in the starting mixture and the applied reaction temperature, t, which is 160* C or lower, is m 8.3-0.06 (t- 100) + OR - 2.3.
Inventors
- 👤 H Kouwenhoven
- 👤 J Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:51
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/18; B01J29/20; B01J29/22; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2861; C01B33/2869; Y; Y10; Y10S; Y10S423/00; Y10S423/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The process of claim 1 wherein the sodium salts of polybasic acids are sodium salts of orthophosphoric acid or carbonic acid.
Claim 2
Dependent Claim
11 words
The process of claim 2 wherein the sodium salt is Na3PO4.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the amorphous silica-alumina is a cogel of aluminum hydroxide on silica hydrogel.
Claim 4
Dependent Claim
54 words
The process of claim 4 wherein the silica-alumina cogel has been prepAred by a procedure which comprises first precipitating a silica hydrogel from an aqueous solution containing silicate ions by adding a mineral acid, subsequently adding an aluminum salt to the mixture, and finally precipitating an aluminum hydroxide gel by adding an alkaline-reacting solution.
Claim 5
Dependent Claim
19 words
The process of claim 4 wherein the silica-alumina cogel is a commercial cracking catalyst with a low alumina content
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the reaction temperature is between 95* and 155*C.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherin the reaction mixture is agitated during the preparation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |