US4594333A
Expired / Lapsed
US
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Zeolite modification
Assignee: Mobil Oil AS
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Filing: 1984-08-31
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Granted: 1986-06-10
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Expires: 2004-08-31
Abstract
Abstract The ion-exchange capacity and acid catalytic activity of a ZSM-5 type zeolite are increased by treatment of a physical mixture of the zeolite and a solid source of aluminum with water in the presence of an alkali metal compound activating agent and an alkali metal salt of a mineral acid.
Inventors
- 👤 Clarence D. Chang
- 👤 Cynthia T. W. Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:10
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
146 words
A method for modifying a composition to increase its acid catalytic activity, said composition comprising a physical mixture of a zeolite and a solid source of aluminum, said zeolite having a silica to alumina ratio of at least 12, and a Constraint Index of about 1 to 12, which method comprises: contacting said mixture with an aqueous solution containing an activating amount of an alkali metal compound selected from the group consisting of an alkali metal hydroxide, an alkali metal salt of a weak acid having a dissociation constant less than about 10 -3 , and mixtures thereof, and an activation-promoting amount of an alkali metal salt of a strong mineral acid, under a combination of conditions including a temperature up to about 370° C. for less than about 1 hour to about 100 hours, said combination of conditions being effective to induce said increased activity.
Claim 2
Independent Claim
146 words
A method for modifying a composition to increase its acid catalytic activity, said composition comprising a physical mixture of a zeolite and a solid source of aluminum, said zeolite having a silica to alumina ratio of at least 12, and a Constraint Index of about 1 to 12, which method comprises: contacting said mixture with an aqueous solution containing an activating amount of an alkali metal compound selected from the group consisting of an alkali metal hydroxide, an alkali metal salt of a weak acid having a dissociation constant less than about 10 -3 , and mixtures thereof, and an activation-promoting amount of an alkali metal salt of a strong mineral acid, under a combination of conditions including a temperature up to about 370° C. for less than about 1 hour to about 100 hours, said combination of conditions being effective to induce said increased activity.
Claim 3
Dependent Claim
36 words
The method described in claim 1 wherein said solid source of aluminum is present as discrete particles, liquid water is present as a continuous liquid phase, and said temperature is about 10° C. to 200° C.
Claim 4
Dependent Claim
19 words
The method described in claim 1 wherein said solid source of aluminum is present as binder for said zeolite.
Claim 5
Dependent Claim
49 words
The method described in claim 3 wherein said alkali metal is lithium, sodium or potassium, said weak acid is acetic, carbonic or phosphoric, said temperature is 10° C. to 200° C., and said aqueous solution is adjusted to a pH of 7 to about 12 before said contacting step.
Claim 6
Dependent Claim
55 words
The method described in claim 4 wherein said alkali metal compound is lithium, sodium or potassium hydroxide at a concentration of 0.001 to about 1 molar in said solution, said temperature is above 0° C. up to about 170° C., and said treatment time is less than about 1 hour up to about 24 hours.
Claim 7
Dependent Claim
22 words
The method described in claim 4 wherein said zeolite is ZSM-5 having a silica to alumina ratio of at least about 10.
Claim 8
Dependent Claim
22 words
The method described in claim 5 wherein said zeolite is ZSM-5 having a silica to alumina ratio of at least about 100.
Claim 9
Dependent Claim
40 words
The method described in claim 4 wherein said zeolite is ZSM-5 having a silica to alumina ratio of at least 70:1, and said combination of treatment conditions is effective to decrease said silica to alumina ratio to less than 60:1.
Claim 10
Dependent Claim
40 words
The method described in claim 5 wherein said zeolite is ZSM-5 having a silica to alumina ratio of at least 70:1, and said combination of treatment conditions is effective to decrease said silica to alumina ratio to less than 60:1.
Claim 11
Dependent Claim
11 words
The method described in claim 1 wherein said zeolite is ZSM-5.
Claim 12
Dependent Claim
11 words
The method described in claim 3 wherein said zeolite is ZSM-5.
Claim 13
Dependent Claim
12 words
The method described in claim 11 wherein said zeolite is deactivated ZSM-5.
Claim 14
Independent Claim
166 words
A method for increasing the cation-exchange capacity of a zeolite having a silica to alumina ratio of at least 12, a Constraint Index of about 1 to 12, and a characteristic X-ray diffraction pattern, said method comprising: forming a physical mixture of said zeolite with a solid comprising alumina, said mixture containing about 10 to 90 parts by weight of said zeolite; contacting said mixture with an aqueous solution containing an activating amount of an alkali metal compound selected from the group consisting of an alkali metal hydroxide, an alkali metal salt of a weak acid having a dissociation constant less than about 10 -3 , and mixtures thereof, and an activation-promoting amount of an alkali metal salt of a strong mineral acid, under a combination of conditions including a temperature up to about 200° C. for less than about 1 hour to about 24 hours, said combination of conditions being effective to induce said increased cation-exchange capacity; and recovering a zeolite of increased cation-exchange capacity.
Claim 15
Independent Claim
166 words
A method for increasing the cation-exchange capacity of a zeolite having a silica to alumina ratio of at least 12, a Constraint Index of about 1 to 12, and a characteristic X-ray diffraction pattern, said method comprising: forming a physical mixture of said zeolite with a solid comprising alumina, said mixture containing about 10 to 90 parts by weight of said zeolite; contacting said mixture with an aqueous solution containing an activating amount of an alkali metal compound selected from the group consisting of an alkali metal hydroxide, an alkali metal salt of a weak acid having a dissociation constant less than about 10 -3 , and mixtures thereof, and an activation-promoting amount of an alkali metal salt of a strong mineral acid, under a combination of conditions including a temperature up to about 200° C. for less than about 1 hour to about 24 hours, said combination of conditions being effective to induce said increased cation-exchange capacity; and recovering a zeolite of increased cation-exchange capacity.
Claim 16
Dependent Claim
26 words
The method described in claim 13 wherein said alkali metal compound is sodium carbonate, said alkali metal salt is sodium nitrate, and said zeolite is ZSM-5.
Claim 17
Dependent Claim
11 words
The method described in claim 13 wherein said zeolite is ZSM-5.
Claim 18
Dependent Claim
9 words
The composition produced by the method of claim 13.
Claim 19
Dependent Claim
9 words
The composition produced by the method of claim 14.
Claim 20
Dependent Claim
9 words
The composition produced by the method of claim 1.
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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |