US4572439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attrition resistant particles and preparation of same
Assignee: Phillips Petroleum Co
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Filing: 1983-11-30
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Granted: 1986-02-25
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Expires: 2003-11-30
Abstract
Abstract Particulate materials such as catalyst or catalyst substrate are slurried and exposed to ultrasonic energy in a rapid attrition treatment.
Inventors
- 👤 Emory W. Pitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:17
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/34; B01J37/341; B01J37/343; B01J8/00; B01J8/18; B01J8/24; B01J8/40; B02; B02C; B02C19/00; B02C19/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A process for separating frangible particles of a fluidizable catalyst support from attrition-resistant particles in a sample containing both attrition-resistant and frangible particles, wherein the particles have a particle size predominantly in the range of 20 to about 200 microns; said process comprising (a) slurrying the particles of the sample in a liquid medium to form a slurry; (b) directing acoustical energy into the slurry to disintegrate the frangible particles, wherein the acoustical energy expended is in the range of from about 0.5 to about 2 kilowatt-hr/kilogram of slurried particles; and (c) recovering the attrition resistant particles of the sample from the liquid medium.
Claim 2
Dependent Claim
104 words
A process for separating frangible particles of a fluidizable catalyst support from attrition-resistant particles in a sample containing both attrition-resistant and frangible particles, wherein the particles have a particle size predominantly in the range of 20 to about 200 microns; said process comprising (a) slurrying the particles of the sample in a liquid medium to form a slurry; (b) directing acoustical energy into the slurry to disintegrate the frangible particles, wherein the acoustical energy expended is in the range of from about 0.5 to about 2 kilowatt-hr/kilogram of slurried particles; and (c) recovering the attrition resistant particles of the sample from the liquid medium.
Claim 3
Dependent Claim
17 words
A process as in claim 1 wherein the particles are predominantly silica-alumina and the liquid is water.
Claim 4
Dependent Claim
129 words
A process for separating attrition-resistant particles from frangible particles in a sample containing both attrition-resistant and frangible particles, said process comprising: (a) slurrying the particles of the sample in a liquid medium to form a slurry; (b) directing acoustical energy into the slurry to disintegrate the frangible particles; and (c) recovering the attrition resistant particles of the sample from the liquid medium; wherein the particles of the sample are of a catalyst support and are formed at least partially from at least one of alumina, silica, titania, and germania and have a size principally in the range of about 5 microns to about 50 millimeters; the liquid medium is inert to the particles; and the acoustical energy has a frequency in the range of 10 to about 5,000,000 KHz.
Claim 5
Dependent Claim
129 words
A process for separating attrition-resistant particles from frangible particles in a sample containing both attrition-resistant and frangible particles, said process comprising: (a) slurrying the particles of the sample in a liquid medium to form a slurry; (b) directing acoustical energy into the slurry to disintegrate the frangible particles; and (c) recovering the attrition resistant particles of the sample from the liquid medium; wherein the particles of the sample are of a catalyst support and are formed at least partially from at least one of alumina, silica, titania, and germania and have a size principally in the range of about 5 microns to about 50 millimeters; the liquid medium is inert to the particles; and the acoustical energy has a frequency in the range of 10 to about 5,000,000 KHz.
Claim 6
Dependent Claim
45 words
A process as in claim 1 wherein the acoustical energy is supplied at an intensity in the range of about 1 to about 10,000 W/cm 2 and the acoustical energy expended is in the range of about 0.1 to about 5 kilowatt-hr/kg of slurried particles.
Claim 7
Dependent Claim
54 words
A process as in claim 4 wherein the particles contain predominantly a material selected from the group consisting of silica, alumina, and silica-alumina and have a particle size predominantly in the range of 10 microns to about 1 mm and the acoustical wave has a frequency in the range of 20 to 2,000 KHz.
Claim 8
Dependent Claim
25 words
A process as in claim 5 further comprising separating the disintegrated material from the liquid medium; and agglomerating the separated disintegrated material into agglomerated particles.
Claim 9
Dependent Claim
16 words
A process as in claim 6 further comprising slurrying the agglomerated particles into the liquid medium.
References Cited (Backward Citations)
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US3337328A
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US4330090A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |