US4530824A
Expired / Lapsed
US
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Process for preparation of L type zeolites
Assignee: Tosoh Corp
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Filing: 1983-10-18
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Granted: 1985-07-23
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Expires: 2003-10-18
Abstract
Abstract An L type zeolite of a high purity is prepared by crystallizing an amorphous sodium alminosilicate compound containing a silicon component in an amount of 67 to 91 wt. % as SiO2 on the anhydrous basis in an aqueous potassium hydroxide solution.
Inventors
- 👤 Junji Arika
- 👤 Keiji Itabashi
- 👤 Yoshio Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B39/00; C01B39/02; C01B39/32; Y; Y10; Y10S; Y10S423/00; Y10S423/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A process for the preparation of L type zeolites, which comprises crystallizing an amorphous sodium aluminosilicate compound containing a silicon component in an amount of 67 to 91% by weight as SiO 2 on the anhydrous basis in an aqueous potassium hydroxide solution, said amorphous sodium aluminosilicate compound having a particle size of 1 to 500 microns and being obtained by reacting an aqueous sodium silicate solution with an aqueous aluminum-containing solution while both the aqueous solutions are simultaneously and continuously supplied to a reaction vessel and the pH value of the reaction product is maintained in the range of from 5 to 9.
Claim 2
Dependent Claim
104 words
A process for the preparation of L type zeolites, which comprises crystallizing an amorphous sodium aluminosilicate compound containing a silicon component in an amount of 67 to 91% by weight as SiO 2 on the anhydrous basis in an aqueous potassium hydroxide solution, said amorphous sodium aluminosilicate compound having a particle size of 1 to 500 microns and being obtained by reacting an aqueous sodium silicate solution with an aqueous aluminum-containing solution while both the aqueous solutions are simultaneously and continuously supplied to a reaction vessel and the pH value of the reaction product is maintained in the range of from 5 to 9.
Claim 3
Dependent Claim
33 words
A process according to claim 1, wherein the amount of the aqueous potassium hydroxide solution is such that a starting slurry for the crystallization has a concentration of 0.04 to 0.45% by weight.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein the molar ratio of potassium hydroxide to the SiO 2 component in the amorphous compound is in the range of from 0.10 to 1.35.
Claim 5
Dependent Claim
21 words
A process according to claim 1, wherein the crystallization is carried out at a temperature of from 100° to 200° C.
Claim 6
Dependent Claim
21 words
A process according to claim 4, wherein the crystallization is carried out for a period of from 12 to 100 hours.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |