Patent US4394362A successfully refreshed from Google Patents.
US4394362A
Expired / Lapsed
US
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Crystalline silicate particle having an aluminum-containing outer shell
Assignee: Chevron USA Inc
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Filing: 1981-04-28
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Granted: 1983-07-19
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Expires: 2001-04-28
Abstract
Abstract Crystalline silicate particles having an aluminum-containing isostructural outer shell. The particles are prepared by first crystallizing crystalline silicate particles from a first reaction medium and thereafter crystallizing an isostructural outer shell onto said crystalline silicate particles from a reaction medium containing an increased source of aluminum.
Inventors
- 👤 Stephen J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:11
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C; C01; C01B; C01B33/00; C01B33/20; C01B33/26; C01B33/28; C01B33/2807; C01B33/2876; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05; C10G35/00; C10G35/04; C10G35/06; C10G35/095; C10G49/00; C10G49/02; C10G49/08; B01J2229/00; B01J2229/60; B01J2229/62; Y; Y10; Y10S; Y10S423/00; Y10S423/22; Y10S423/29
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
117 words
A particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1 and wherein said particle is prepared by a process comprising: (1) initiating crystallization in a crystallization medium substantially free of aluminum to produce the intermediate pore size crystalline silicate; (2) adding a source of aluminum to said crystallization medium; and (3) crystallizing onto said crystalline silicate the isostructural outer portion which comprises alumina.
Claim 2
Dependent Claim
117 words
A particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1 and wherein said particle is prepared by a process comprising: (1) initiating crystallization in a crystallization medium substantially free of aluminum to produce the intermediate pore size crystalline silicate; (2) adding a source of aluminum to said crystallization medium; and (3) crystallizing onto said crystalline silicate the isostructural outer portion which comprises alumina.
Claim 3
Dependent Claim
128 words
A particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1 and wherein said particle is prepared by a process comprising: (1) crystallizing the intermediate pore size crystalline silicate from a first reaction medium substantially free of aluminum; (2) removing said crystalline silicate from said first reaction medium; (3) adding said crystalline silicate to a second reaction medium comprising sources of aluminum, and (4) crystallizing the isostructural, alumina containing outer layer onto said crystalline silicate.
Claim 4
Dependent Claim
128 words
A particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1 and wherein said particle is prepared by a process comprising: (1) crystallizing the intermediate pore size crystalline silicate from a first reaction medium substantially free of aluminum; (2) removing said crystalline silicate from said first reaction medium; (3) adding said crystalline silicate to a second reaction medium comprising sources of aluminum, and (4) crystallizing the isostructural, alumina containing outer layer onto said crystalline silicate.
Claim 5
Dependent Claim
12 words
The particle of claim 2 having the X-ray diffraction pattern of ZSM-5.
Claim 6
Dependent Claim
12 words
The particle of claim 2 having the X-ray diffraction pattern of ZSM-11.
Claim 7
Dependent Claim
112 words
A process for preparing a particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1, comprising: (1) initiating crystallization in a crystallization medium substantially free of aluminum to produce the intermediate pore size crystalline silicate; (2) adding a source of aluminum to said crystallization medium; and (3) crystallizing onto said crystalline silicate the isostructural outer portion which comprises alumina.
Claim 8
Dependent Claim
112 words
A process for preparing a particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1, comprising: (1) initiating crystallization in a crystallization medium substantially free of aluminum to produce the intermediate pore size crystalline silicate; (2) adding a source of aluminum to said crystallization medium; and (3) crystallizing onto said crystalline silicate the isostructural outer portion which comprises alumina.
Claim 9
Dependent Claim
18 words
The process of claim 5 wherein the reaction mixture comprises sources of organic cation, silica and hydroxide ion.
Claim 10
Dependent Claim
14 words
The process of claim 6 wherein the source of hydroxide ion is sodium hydroxide.
Claim 11
Dependent Claim
24 words
The process of claim 6 wherein in step (2) the organic ion to SiO 2 mole ratio is reduced from that in step (1).
Claim 12
Dependent Claim
19 words
The process of claim 7 wherein in step (2) the hydroxide content is lower than that in step (1).
Claim 13
Dependent Claim
30 words
The process of claim 5 wherein step (3) is performed at a temperature of from about 100° C. to 120° C. and at a pH of from 10 to 12.
Claim 14
Dependent Claim
34 words
The process of claim 5 wherein said crystalline silicate is silicalite having a silica:alumina mole ratio greater than about 200:1 and said isostructural outer portion has a silica:alumina mole ratio less than about 100:1.
Claim 15
Dependent Claim
123 words
A process for preparing a particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1, comprising: (1) crystallizing the intermediate pore size crystalline silicate from a first reaction medium substantially free of aluminum; (2) removing said crystalline silicate from said first reaction medium; (3) adding said crystalline silicate to a second reaction medium comprising sources of aluminum, and (4) crystallizing the isostructural, alumina containing outer layer onto said crystalline silicate.
Claim 16
Dependent Claim
123 words
A process for preparing a particle, comprising an inner portion and an outer portion disposed as a shell around said inner portion wherein said outer portion has the same crystal structure as said inner portion, said inner portion comprising an intermediate pore size crystalline silicate having a silica:alumina mole ratio greater than about 200:1, and said outer portion having a silica:alumina mole ratio of less than about 100:1, comprising: (1) crystallizing the intermediate pore size crystalline silicate from a first reaction medium substantially free of aluminum; (2) removing said crystalline silicate from said first reaction medium; (3) adding said crystalline silicate to a second reaction medium comprising sources of aluminum, and (4) crystallizing the isostructural, alumina containing outer layer onto said crystalline silicate.
Claim 17
Dependent Claim
21 words
The process of claim 12 wherein the first and second reaction mixtures comprise sources of organic cation, silica and hydroxide ion.
Claim 18
Dependent Claim
14 words
The process of claim 13 wherein the source of hydroxide ion is sodium hydroxide.
Claim 19
Dependent Claim
24 words
The process of claim 13 wherein in step (3) the organic ion to SiO 2 mole ratio is reduced from that in step (1).
Claim 20
Dependent Claim
19 words
The process of claim 14 wherein in step (3) the hydroxide content is lower than that in step (1).
Claim 21
Dependent Claim
30 words
The process of claim 12 wherein step (4) is performed at a temperature of from about 100° C. to 120° C. and at a pH of from 10 to 12.
Claim 22
Dependent Claim
33 words
The process of claim 12 wherein said crystalline silicate is silicalite having a silica:alumina ratio greater than about 200:1 and said isostructural outer portion has a silica:alumina mole ratio less than about 100:1.
Claim 23
Dependent Claim
19 words
The composition of claim 2 wherein the silica:alumina mole ratio of said inner portion is greater than about 500:1.
Claim 24
Dependent Claim
19 words
The composition of claim 2 wherein the silica:alumina mole ratio of said inner portion is greater than about 1000:1.
References Cited (Backward Citations)
US3709979A
Cited
US3941871A
Cited
US4175114A
Cited
US4061724A
Cited
US4088605A
Cited
US4203869A
Cited
US4104294A
Cited
US4309276A
Cited
US4309275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |