US5059567A
Expired / Lapsed
US
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Process for the preparation of a modified zeolite
Assignee: CONTEKA BV
•
Filing: 1988-07-13
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Granted: 1991-10-22
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Expires: 2008-07-13
Abstract
Abstract Zeolite Y comprising aluminum ions supplied and fixed by ion-exchange is produced by subjecting zeolite NaY to a series of treatment steps comprising e.g. ammonium ion-exchange and calcination. In order to supply and fix the aluminum ions, an aluminum ion-exchange is carried out, followed by further calcination in a saturated or substantially saturated steam (water vapor) atmosphere at 400°-900° C. If the zeolite unit cell size is to be reduced to 24.15-24.35 Å, simultaneously as the aluminum ions are fixed, the last-mentioned calcination is carried out in a saturated or essentially saturated (steam) water vapor atmosphere at 500°-900° C. It is further disclosed that the steam used in the calcination step can be supplied either from an external source or solely by vaporization of water present in the zeolite.
Inventors
- 👤 Olof M. Linsten
- 👤 Arne O. Frestad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:15
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/30; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
94 words
An improved process for the production of a modified zeolite Y comprising aluminum ions supplied and fixed by ion-exchange and preferably also having a small unit cell size, in which process NaY zeolite is prepared and subjected to a series of treatment steps comprising ammonium ion-exchange, calcination, aluminum (III) ion-exchange and drying, the improvement which comprises subjecting the zeolite, after the aluminum (III) ion-exchange step, to a further calcination step, at least the last-mentioned calcination step being carried out in a steam atmosphere at 400-900° C. to fix the aluminum ions supplied by ion-exchange.
Claim 2
Dependent Claim
94 words
An improved process for the production of a modified zeolite Y comprising aluminum ions supplied and fixed by ion-exchange and preferably also having a small unit cell size, in which process NaY zeolite is prepared and subjected to a series of treatment steps comprising ammonium ion-exchange, calcination, aluminum (III) ion-exchange and drying, the improvement which comprises subjecting the zeolite, after the aluminum (III) ion-exchange step, to a further calcination step, at least the last-mentioned calcination step being carried out in a steam atmosphere at 400-900° C. to fix the aluminum ions supplied by ion-exchange.
Claim 3
Dependent Claim
37 words
A process as claimed in claim 1, wherein said last-mentioned calcination step is carried out at 500-900° C. for decreasing the unit cell size to 21.15-24.35 Å in dependence on the amount of aluminum supplied by ion-exchange.
Claim 4
Dependent Claim
33 words
A process as claimed in claim 1, wherein the aluminum ion-exchange is carried out until the (NH 4 ) 2 O content of the zeolite has been reduced to below 1.5% by weight.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1, wherein the ammonium ion-exchange is carried out with a compound selected from the class consisting of ammonium chloride, ammonium nitrate and ammonium sulphate.
Claim 6
Dependent Claim
29 words
A process claimed in claim 1, wherein the aluminum ion-exchange is carried out with a compound selected from the class consisting of aluminum chloride, aluminum nitrate and aluminum sulphate.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 1, wherein calcination is carried out in an atmosphere saturated with steam.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1, wherein the aluminum ion-exchange is carried out on an ultrastable zeolite Y.
Claim 9
Dependent Claim
41 words
A process as claimed in claim 1, wherein the NaY zeolite is first ammonium ion-exchanged and then calcined in an atmosphere saturated with steam, whereupon it is ammonium ion-exchanged and aluminum ion-exchanged and finally calcined in an atmosphere saturated with steam.
Claim 10
Dependent Claim
20 words
A process as claimed in claim 1, wherein the last-mentioned calcination is carried out at a temperature of 400°-500° C.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 1, wherein the calcination carried out prior to the aluminum ion-exchange is carried out at 500°-900° C.
Claim 12
Dependent Claim
22 words
The process as claimed in claim 1, wherein the last mentioned calcination step is carried out at a temperature of 400°-450° C.
Claim 13
Dependent Claim
23 words
The process as claimed in claim 1, wherein the calcination carried out prior to the aluminum ion-exchange is carried out at 550°-750° C.
Claim 14
Dependent Claim
22 words
The process as claimed in claim 1, wherein the steam is supplied solely from vaporization of the water present in the zeolite.
Claim 15
Dependent Claim
22 words
The process as claimed in claim 6, wherein the steam is supplied solely from vaporization of the water present in the zeolite.
Claim 16
Dependent Claim
22 words
The process as claimed in claim 8, wherein the steam is supplied solely from vaporization of the water present in the zeolite.
Claim 17
Dependent Claim
34 words
A process as claimed in claim 2, wherein the aluminum ion-exchange is carried out until the (NH 4 ) 2 O content of the zeolite has been reduced to below about 1.5% by weight.
Claim 18
Dependent Claim
30 words
A process as claimed in claim 2, wherein the ammonium ion-exchange is carried out with a compound selected from the group consisting of ammonium chloride, ammonium nitrate and ammonium sulphate.
Claim 19
Dependent Claim
29 words
A process claimed in claim 2, wherein the aluminum ion-exchange is carried out with a compound selected from the group consisting of aluminum chloride, aluminum nitrate and aluminum sulphate.
Claim 20
Dependent Claim
18 words
A process as claimed in claim 2, wherein calcination is carried out in an atmosphere saturated with steam.
Claim 21
Dependent Claim
19 words
A process as claimed in claim 2, wherein the aluminum ion-exchange is carried out on an ultrastable zeolite Y.
Claim 22
Dependent Claim
41 words
A process as claimed in claim 2, wherein the NaY zeolite is first ammonium ion-exchanged and then calcined in an atmosphere saturated with steam, whereupon it is ammonium ion-exchanged and aluminum ion-exchanged and finally calcined in an atmosphere saturated with steam.
Claim 23
Dependent Claim
23 words
A process as claimed in claim 2, wherein the calcination carried out prior to the aluminum ion-exchange is carried out at 500°-900° C.
Claim 24
Dependent Claim
23 words
The process as claimed in claim 2, wherein the calcination carried out prior to the aluminum ion-exchange is carried out at 550°-750° C.
Claim 25
Dependent Claim
79 words
In a process for the production of a modified zeolite Y comprising subjecting a NaY zeolite to a series of treatment steps comprising ammonium ion-exchange, calcination, aluminum ion-exchange and drying, the improvement which comprises subjecting the zeolite, after the aluminum (III) ion-exchange step, to a further calcination step, at least the last-mentioned calcination step being carried out at 400°-900° C. in a steam atmosphere wherein the steam is supplied solely from vaporization of the water present in the zeolite.
Claim 26
Dependent Claim
79 words
In a process for the production of a modified zeolite Y comprising subjecting a NaY zeolite to a series of treatment steps comprising ammonium ion-exchange, calcination, aluminum ion-exchange and drying, the improvement which comprises subjecting the zeolite, after the aluminum (III) ion-exchange step, to a further calcination step, at least the last-mentioned calcination step being carried out at 400°-900° C. in a steam atmosphere wherein the steam is supplied solely from vaporization of the water present in the zeolite.
Claim 27
Dependent Claim
18 words
A process as claimed in claim 24, wherein calcination is carried out in an atmosphere saturated with steam.
Claim 28
Dependent Claim
19 words
A process as claimed in claim 24, wherein the calcination is carried out at a temperature of 400°-500° C.
Claim 29
Dependent Claim
20 words
The process as claimed in claim 24, wherein the calcination step is carried out at a temperature of 400°-450° C.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
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