Patent US4340573A successfully refreshed from Google Patents.
US4340573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of zeolites
Assignee: WR Grace and Co Conn
•
Filing: 1980-01-09
•
Granted: 1982-07-20
•
Expires: 2000-01-09
Abstract
Abstract Synthetic crystalline alumino-silicate zeolites are prepared by combining reactant quantities of alumina, silica, sodium hydroxide and water with zeolite-forming alumino-silicate seeds having the composition 16 Na2O: 2 to 9 Al2O3: 15 SiO2: 500 to 2000 H2O. The seed compositions may be used to produce Type A, X and Y crystalline alumino-silicate zeolites.
Inventors
- 👤 David E. W. Vaughan
- 👤 Grant C. Edwards
- 👤 Michael G. Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:24
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2815; C01B33/2823; Y; Y10; Y10S; Y10S423/00; Y10S423/21; Y10S423/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A method for preparing a crystalline aluminosilicate zeolite-forming seed composition having the mol ratio formula: 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :500 to 2000H.sub.2 O which comprises: (a) mixing a sodium aluminate solution with a sodium silicate solution to obtain a gel having the following mol ratio formula: 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :300 to 340H.sub.2 O; (b) agitating and reacting the gel obtained in step (a) at a temperature of from about 10° to 80° C. for about 1/4 to 96 hours; and (c) adding water to the gel obtained in step (b) with agitation to obtain a homogenous fluid seed composition having the mol ratio formula: 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :500 to 2000H.sub.2 O.
Claim 2
Independent Claim
119 words
A method for preparing a crystalline aluminosilicate zeolite-forming seed composition having the mol ratio formula: 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :500 to 2000H.sub.2 O which comprises: (a) mixing a sodium aluminate solution with a sodium silicate solution to obtain a gel having the following mol ratio formula: 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :300 to 340H.sub.2 O; (b) agitating and reacting the gel obtained in step (a) at a temperature of from about 10° to 80° C. for about 1/4 to 96 hours; and (c) adding water to the gel obtained in step (b) with agitation to obtain a homogenous fluid seed composition having the mol ratio formula: 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :500 to 2000H.sub.2 O.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the homogenous mixture of step (c) is held at a temperature of 10° to 60° C. for about 1/4 to 96 hours.
Claim 4
Dependent Claim
12 words
An aluminosilicate zeolite-forming seed composition obtained by the process of claim 1.
References Cited (Backward Citations)
US3433589A
Cited
US3574538A
Cited
US3639099A
Cited
US3671191A
Cited
US3808326A
Cited
US4178352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |