Patent US4526877A successfully refreshed from Google Patents.
US4526877A
Expired / Lapsed
US
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Attrition resistant molecular sieve
Assignee: Katalistiks International Inc
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Filing: 1984-09-28
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Granted: 1985-07-02
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Expires: 2004-09-28
Abstract
Abstract An attrition resistant molecular sieve composition comprising a generally spherical, high porosity molecular sieve particle having an exposed surface coated with a thin, generally uniform layer of solid lubricant which can be employed in fixed, moving or fluidized beds with low attrition and without significantly reduced activity.
Inventors
- 👤 Arun Acharya
- 👤 William E. BeVier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:45
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
61 words
A composition comprising a generally spherical, friable, high porosity molecular sieve particle, having an adherent surface comprising surface irregularities and, adhered to the exposed adherent surface of said particle, a thin, generally uniform coating of a solid lubricant in an amount of from about 1.0×10 -7 to 2.0×10 -3 gram per square centimeter of the projected surface area of said particle.
Claim 2
Dependent Claim
61 words
A composition comprising a generally spherical, friable, high porosity molecular sieve particle, having an adherent surface comprising surface irregularities and, adhered to the exposed adherent surface of said particle, a thin, generally uniform coating of a solid lubricant in an amount of from about 1.0×10 -7 to 2.0×10 -3 gram per square centimeter of the projected surface area of said particle.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein said amount is from about 1.0×10 -7 to 1.0×10 -3 gram per square centimeter.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein said amount is from 1.0×10 -7 to 3.0×10 -4 gram per square centimeter.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein said molecular sieve particle comprises 13X molecular sieve.
Claim 6
Dependent Claim
14 words
The composition of claim 1 wherein said molecular sieve particle comprises 4A molecular sieve.
Claim 7
Dependent Claim
11 words
The composition of claim 1 wherein said solid lubricant is graphite.
Claim 8
Dependent Claim
12 words
The composition of claim 1 wherein said solid lubricant is molybdenum disulfide.
Claim 9
Dependent Claim
11 words
The composition of claim 1 wherein said solid lubricant is polytetrafluoroethylene.
Claim 10
Dependent Claim
14 words
The composition of claim 1 wherein said solid lubricant is derived from activated carbon.
Claim 11
Dependent Claim
73 words
A process for rendering a generally spherical, high porosity, friable molecular sieve particle having an adherent surface comprising surface irregularities more resistant to attrition comprising applying a dry lubricant to the exposed surface of said particle to adhere to said exposed surface a thin, generally uniform layer of solid lubricant in an amount of from about 1.0×10 -7 to 2.0×10 -3 gram per square centimeter of the projected surface area of said particle.
Claim 12
Dependent Claim
73 words
A process for rendering a generally spherical, high porosity, friable molecular sieve particle having an adherent surface comprising surface irregularities more resistant to attrition comprising applying a dry lubricant to the exposed surface of said particle to adhere to said exposed surface a thin, generally uniform layer of solid lubricant in an amount of from about 1.0×10 -7 to 2.0×10 -3 gram per square centimeter of the projected surface area of said particle.
Claim 13
Dependent Claim
19 words
The process of claim 10 wherein said amount is from 1.0×10 -7 to 1.0×10 -3 gram per square centimeter.
Claim 14
Dependent Claim
19 words
The process of claim 10 wherein said amount is from 1.0×10 -7 to 3.0×10 -4 gram per square centimeter.
Claim 15
Dependent Claim
14 words
The process of claim 10 wherein said molecular sieve particle comprises 13X molecular sieve.
Claim 16
Dependent Claim
14 words
The process of claim 10 wherein said molecular sieve particle comprises 4A molecular sieve.
Claim 17
Dependent Claim
11 words
The process of claim 10 wherein said solid lubricant is graphite.
Claim 18
Dependent Claim
12 words
The process of claim 10 wherein said solid lubricant is molybdenum disulfide.
Claim 19
Dependent Claim
11 words
The process of claim 10 wherein said solid lubricant is polytetrafluoroethylene.
Claim 20
Dependent Claim
26 words
The process of claim 10 wherein said layer is applied by combining sieve particles and solid lubricant in roll mill means and rolling the resulting mixture.
Claim 21
Dependent Claim
30 words
The process of claim 10 wherein said layer is applied by combining sieve particles and solid lubricant in a bed and operating the bed in a moving or fluidized condition.
Claim 22
Dependent Claim
13 words
The process of claim 19 wherein the solid lubricant is in pellet form.
Claim 23
Dependent Claim
12 words
The process of claim 20 wherein the pellet comprises beaded activated carbon.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |