Patent US3791795A successfully refreshed from Google Patents.
US3791795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interbed seal for multibed reactors
Assignee: Monsanto Co
•
Filing: 1971-11-19
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Granted: 1974-02-12
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Expires: 1991-11-19
Abstract
Abstract An improved interbed seal for fixed multibed vapor phase catalytic reactors which provides minimum leakage between beds operated under different conditions or with different reactant concentrations. The improved seal consists in a floating seal of a plurality of layers of different sizes of finely divided inert material of increasing size from the center of the seal to the adjacent catalyst beds. The improved seal offers efficient sealing, economy of cost and ease of charge and discharge together with the plurality of catalyst beds for regeneration or recharging fresh catalysts. The preferred finely divided inert material is well-sieved sand of a plurality of different size ranges from smaller than 100 mesh to one-eighth inch.
Inventors
- 👤 B Pan
- 👤 J Garton
- 👤 R Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:24
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/321; B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0453; C07C5/327; C07C5/333; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00265; B01J2208/00274; B01J2208/02; B01J2208/023; B01J2208/024; B01J2208/025; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
22 words
The vapor barrier of claim 1 wherein the inert material ranges in size from smaller than 100 mesh to about one-eighth inch.
Claim 2
Dependent Claim
27 words
The vapor barrier of claim 1 wherein the finely divided inert material comprises glass, sand, quartz sand, quartzite sand, ilmenite sand, flint, alumina, titania, zirconia or beryllia.
Claim 3
Dependent Claim
14 words
The vapor barrier of claim 1 wherein the finely divided inert material comprises sand.
Claim 4
Dependent Claim
21 words
The vapor barrier of claim 4 wherein the sand ranges in size from smaller than 100 mesh to about one-eighth inch.
Claim 5
Dependent Claim
33 words
The vapor barrier of claim 1 wherein the layers of inert material comprises a layer of 75 mesh or smaller size and adjacent upper and lower layers of greater than 75 mesh size.
Claim 6
Dependent Claim
47 words
The vapor barrier of claim 1 wherein the layers of inert material comprise a layer of from about 75 to about 140 mesh size, adjacent layers of from about 20 to about 80 mesh size and upper and lower layers of greater than about 20 mesh size.
Claim 7
Dependent Claim
62 words
The vapor barrier of claim 1 wherein the layers of inert material comprise a layer of from about 80 to about 120 mesh size, adjacent layers of from about 30 to about 80 mesh size, next adjacent layers of from about 10 to about 20 mesh size and upper and lower layers of from about one-eighth inch to about 16 mesh size.
Claim 8
Dependent Claim
13 words
The vapor barrier of claim 8 wherein the inert material comprises well-sieved sand.
Claim 9
Dependent Claim
33 words
The vapor barrier of claim 1 wherein a free-floating metallic or ceramic screen or fabric is interposed between the lowest layer of finely divided inert material and the catalyst bed below said seal.
Claim 10
Dependent Claim
22 words
The vapor barrier of claim 1 wherein said central layer comprises from 40-96 percent of the total depth of said inert material.
Claim 11
Dependent Claim
37 words
The vapor barrier of claim 1 wherein said central layer comprises from 40-70 percent, each lower layer comprises from 7-10 percent and each upper layer comprises from 3-7 percent of the total depth of said inert material.
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |