US3933974A
Expired / Lapsed
US
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Process for the preparation of ferrierite
Assignee: Shell USA Inc
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Filing: 1975-02-18
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Granted: 1976-01-20
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Expires: 1995-02-18
Abstract
Abstract Ferrierite is prepared by maintaining at a temperature from about 170° to 215°C an aqueous mixture of amorphous silica-alumina and sodium and potassium compounds wherein from about 65 to about 90 mol % of the alkali metal as X 2 O wherein X represents Na and K originates from salts of at least one polybasic acid having a pK value greater than 10° at 18°C for the highest dissociation step, and the molar fraction of potassium to total sodium and potassium content is from about 10 to 45%, until ferrierite crystals are formed.
Inventors
- 👤 Bruce H. C. Winquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:22
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/65; C; C01; C01B; C01B39/00; C01B39/02; C01B39/44; Y; Y10; Y10S; Y10S423/00; Y10S423/23
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A method for the preparation of ferrierite which comprises maintaining at a temperature from about 170° to about 215°C an aqueous starting mixture of amorphous silica-alumina having a silica/alumina ratio from about 9 to about 25 and a mixture of sodium and potassium compounds until ferrierite crystals are formed, provided that in the starting mixture: a. the amount of total sodium and potassium concentration expressed as Na 2 O + K 2 O = X 2 O, when expressed as the molar ratio X 2 O/Al 2 O 3 is from about 2.5 to about 7.5; b. from about 65 to about 90 mol % of the total sodium and potassium, expressed as X 2 O, originates from sodium and/or potassium salts of polybasic acids having a pK value greater than 10° at 18°C for the highest dissociation step; c. the potassium ion fraction is from about 0.1 to about 0.45; and d. the molar ratio H 2 O/Al 2 O 3 is from about 225 to about 315.
Claim 2
Independent Claim
169 words
A method for the preparation of ferrierite which comprises maintaining at a temperature from about 170° to about 215°C an aqueous starting mixture of amorphous silica-alumina having a silica/alumina ratio from about 9 to about 25 and a mixture of sodium and potassium compounds until ferrierite crystals are formed, provided that in the starting mixture: a. the amount of total sodium and potassium concentration expressed as Na 2 O + K 2 O = X 2 O, when expressed as the molar ratio X 2 O/Al 2 O 3 is from about 2.5 to about 7.5; b. from about 65 to about 90 mol % of the total sodium and potassium, expressed as X 2 O, originates from sodium and/or potassium salts of polybasic acids having a pK value greater than 10° at 18°C for the highest dissociation step; c. the potassium ion fraction is from about 0.1 to about 0.45; and d. the molar ratio H 2 O/Al 2 O 3 is from about 225 to about 315.
Claim 3
Dependent Claim
21 words
A method as in claim 1 wherein the amorphous silica-alumina has a silica/alumina molar ratio from about 10 to about 24.
Claim 4
Dependent Claim
28 words
A method as in claim 1 wherein the total sodium and potassium concentration expressed as X 2 O/Al 2 O 3 is from about 3.5 to about 6.5.
Claim 5
Dependent Claim
53 words
A method as in claim 1 wherein from about 70 to about 85 mol % of the total sodium and potassium present in the starting mixture expressed as X 2 O originates from sodium or potassium salts of polybasic acids having pK value greater than 10° at 18°C for the highest dissociation step.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the potassium ion fraction is from about 0.15 to about 0.40.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein the molar ratio H 2 O/Al 2 O 3 is from about 240 to about 300.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein the temperature is from about 175°C to about 210°C.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein the silica-alumina is a commercial cracking catalyst with low alumina content.
Claim 10
Dependent Claim
25 words
The method of claim 1 wherein at least one of the sodium and potassium salts of polybasic acids are salts of phosphoric or carbonic acid.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the starting mixture is agitated during the preparation.
References Cited (Backward Citations)
US3758667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |