US4526767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of ZSM-5 zeolite
Assignee: Coal Industry Patents Ltd
•
Filing: 1983-12-13
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Granted: 1985-07-02
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Expires: 2003-12-13
Abstract
Abstract Catalysts of the ZSM-5 synthetic zeolite type can be prepared by heating a mixture of a precursor for an alumina hydrate, a precursor for silica hydrogel, an alkali metal hydroxide and water together with an organic templating agent selected from the group of carboxymethylcellulose, the condensation product of an alkanolamine and a fatty acid and cellulose hydroxyethyl ether and therafter heating the reaction product under autogeneous conditions. Unlike prior proposals ZSM-5 which is uncontaminated by other zeolites, is prepared in high yield.
Inventors
- 👤 Joseph G. Robinson
- 👤 David I. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:43
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/36; C01B39/38; C01B39/40; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; Y; Y10; Y10S; Y10S423/00; Y10S423/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A process for the production of crystalline ZSM-5 synthetic zeolite, comprising mixing a presursor for an alumina hydrate, a precursor for silica hydrogel, an alkali metal hydroxide and water together with an organic templating reagent selected from carboxymethylcellulose and cellulose hydroxyethyl ether, and thereafter heating the reaction product under autogenous conditions.
Claim 2
Dependent Claim
51 words
A process for the production of crystalline ZSM-5 synthetic zeolite, comprising mixing a presursor for an alumina hydrate, a precursor for silica hydrogel, an alkali metal hydroxide and water together with an organic templating reagent selected from carboxymethylcellulose and cellulose hydroxyethyl ether, and thereafter heating the reaction product under autogenous conditions.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein the precursor for alumina hydrate is selected from water soluble aluminates, aluminium salts and aluminium alkyls and alkoxides.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 2, wherein the precursor for alumina hydrate is an aluminium salt in solution in ethanol.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein the alkali metal hydroxide is sodium hydroxide.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1, wherein the precursor for silica hydrogel is selected from tetraethyl ortho silicate, silicon tetrachloride, pyrogenic silica and sodium silicate.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1, wherein the heating step is carried out at a temperature of 100° to 250° C.
References Cited (Backward Citations)
US3702886A
Cited
US3676063A
Cited
EP0002899A1
Cited
US4407728A
Cited
GB2066230A
Cited
GB2071632A
Cited
JPS56160315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |