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US4444900A
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Activation of zeolites
Assignee: Mobil Oil AS
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Filing: 1982-05-05
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Granted: 1984-04-24
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Expires: 2002-05-05
Abstract
Abstract A method for enhancing the activity of a synthetic crystalline zeolite, including a zeolite having a silica-to-alumina mole ratio greater than 100, which has been synthesized from a reaction mixture containing a diamine as a cation source, is disclosed which involves reacting the zeolite with a dilute aqueous solution of hydrogen fluoride, contacting the hydrogen fluoride reacted zeolite with aluminum chloride, treating the aluminum chloride contacted zeolite by contact with an ammonium salt solution or ammonolysis and calcining the final product.
Inventors
- 👤 Clarence D. Chang
- 👤 Joseph N. Miale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:37
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/703; B01J2229/00; B01J2229/10; B01J2229/18; B01J2229/30; B01J2229/37; B01J29/40; B01J29/65
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A method for enhancing the activity of a synthetic porous crystalline zeolite having a silica-to-alumina mole ratio greater than about 100, said zeolite having been synthesized from a reaction mixture containing a diamine as a cation source, which comprises the sequential steps of reacting the zeolite with a dilute aqueous solution of hydrogen fluoride of from about 0.1 to about 5 Normal at a temperature of from about 0° C. to about 30° C. for a time of less than about 60 minutes, contacting the hydrogen fluoride reacted zeolite with aluminum chloride vapor at a temperature of from about 100° C. to about 850° C., treating the aluminum chloride contacted zeolite by contact with an ammonium salt solution or ammonolysis, and calcining the resulting material at a temperature of from about 200° C. to about 600° C.
Claim 2
Independent Claim
137 words
A method for enhancing the activity of a synthetic porous crystalline zeolite having a silica-to-alumina mole ratio greater than about 100, said zeolite having been synthesized from a reaction mixture containing a diamine as a cation source, which comprises the sequential steps of reacting the zeolite with a dilute aqueous solution of hydrogen fluoride of from about 0.1 to about 5 Normal at a temperature of from about 0° C. to about 30° C. for a time of less than about 60 minutes, contacting the hydrogen fluoride reacted zeolite with aluminum chloride vapor at a temperature of from about 100° C. to about 850° C., treating the aluminum chloride contacted zeolite by contact with an ammonium salt solution or ammonolysis, and calcining the resulting material at a temperature of from about 200° C. to about 600° C.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said zeolite has a silica-to-alumina mole ratio greater than about 500.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said aluminum chloride contacted zeolite is thereafter treated by contact with an ammonium salt solution.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the ammonium salt is selected from the group consisting of ammonium nitrate, ammonium sulfate and ammonium chloride.
Claim 6
Dependent Claim
12 words
The method of claim 4 wherein said ammonium salt is ammonium nitrate.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein said aluminum chloride contacted zeolite is thereafter treated by ammonolysis.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein said zeolite is ZSM-5, ZSM-11, ZSM-35 or ZSM-48.
Claim 9
Dependent Claim
14 words
The method of claim 2 wherein said zeolite is ZSM-5, ZSM-11, ZSM-35 or ZSM-48.
Claim 10
Dependent Claim
21 words
A zeolite composition having enhanced activity prepared by the method of claim 1, 2, 3, 4, 5, 6, 7 or 8.
Claim 11
Independent Claim
144 words
A method for enhancing the activity of a synthetic porous crystalline zeolite having the crystal structure of zeolite ZSM-48 and a silica-to-alumina mole ratio greater than about 100, said zeolite having been synthesized from a reaction mixture containing a diamine as a cation source, which comprises the sequential steps of reacting the zeolite with a dilute aqueous solution of hydrogen fluoride of from about 0.1 to about 5 Normal at a temperature of from about 0° C. to about 30° C. for a time of less than about 60 minutes, contacting the hydrogen fluoride reacted zeolite with aluminum chloride vapor at a temperature of from about 100° C. to about 850° C., treating the aluminum chloride contacted zeolite by contact with an ammonium salt solution or ammonolysis, and calcining the resulting material at a temperature of from about 200° C. to about 600° C.
Claim 12
Independent Claim
144 words
A method for enhancing the activity of a synthetic porous crystalline zeolite having the crystal structure of zeolite ZSM-48 and a silica-to-alumina mole ratio greater than about 100, said zeolite having been synthesized from a reaction mixture containing a diamine as a cation source, which comprises the sequential steps of reacting the zeolite with a dilute aqueous solution of hydrogen fluoride of from about 0.1 to about 5 Normal at a temperature of from about 0° C. to about 30° C. for a time of less than about 60 minutes, contacting the hydrogen fluoride reacted zeolite with aluminum chloride vapor at a temperature of from about 100° C. to about 850° C., treating the aluminum chloride contacted zeolite by contact with an ammonium salt solution or ammonolysis, and calcining the resulting material at a temperature of from about 200° C. to about 600° C.
Claim 13
Dependent Claim
13 words
A zeolite composition having enhanced activity prepared by the method of claim 10.
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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |