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Patent US3917544A successfully refreshed from Google Patents.
US3917544A
Expired / Lapsed
US
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Agglomerated adsorbent products of molecular sieve grains
Assignee: Rhone Progil SA
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Filing: 1973-10-04
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Granted: 1975-11-04
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Expires: 1993-10-04
Abstract
Abstract An adsorbent agglomerate of molecular sieve grains bonded with an inorganic binder in admixture with the grains and prepared by mixing the molecular sieve grains with partially dehydrated aluminum trihydrate and exposing the composition to moisture to harden the alumina after agglomeration to the desired shape.
Inventors
- 👤 Max Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:48
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
AN ADSORBENT AGGLOMERATE CONSISTING ESSENTIALLY OF MOLECULAR SIEVE GRAINS AND AN INORGANIC BINDER OF ALUMINA PREPARED BY PARTIALLY DEHYDRATING AN ALUMINA HYDRATE IN A CURRENT OF HOT GAS AT A TEMPERATURE WITHIN THE RANGE OF 400 TO 100$C FOR A TIME RANGING FROM A FRACTION OF A SECOND UP TO 10 SECONDS, WITH THE PARTIALLY DEHYDRATED ALUMINA BEIGN AGED IN THE PRESENCE OF WATER AND IN THE PRESENCE OF THE MOLECULAR SIEVE GRAINS AND WITH THE RESULTING AGED ALUMINA BEIGN ACTIVSATED WHILE IN CONTACT WITH THE MOLECULAR SIEVE GRAINS BY CALCINATION TO FORM THE AGGLOMERATES.
Claim 2
Dependent Claim
95 words
AN ADSORBENT AGGLOMERATE CONSISTING ESSENTIALLY OF MOLECULAR SIEVE GRAINS AND AN INORGANIC BINDER OF ALUMINA PREPARED BY PARTIALLY DEHYDRATING AN ALUMINA HYDRATE IN A CURRENT OF HOT GAS AT A TEMPERATURE WITHIN THE RANGE OF 400 TO 100$C FOR A TIME RANGING FROM A FRACTION OF A SECOND UP TO 10 SECONDS, WITH THE PARTIALLY DEHYDRATED ALUMINA BEIGN AGED IN THE PRESENCE OF WATER AND IN THE PRESENCE OF THE MOLECULAR SIEVE GRAINS AND WITH THE RESULTING AGED ALUMINA BEIGN ACTIVSATED WHILE IN CONTACT WITH THE MOLECULAR SIEVE GRAINS BY CALCINATION TO FORM THE AGGLOMERATES.
Claim 3
Independent Claim
104 words
A method for the preparation of adsorbent agglomerates consisting essentially of molecular sive grains and an inorganic binder of activated alumina in admixture with the grains, comprising the steps of mixing the molecular sieve grains with a partially dehydrated alumina prepared by contacting an alumina hydrate in a current of hot gas at a temperature within the range of 400* to 1000*C for a time ranging from a fraction of a second up to 10 seconds, agglomerating the mixture, exposing the agglomerate to moisture to age and harden the alumina, drying the agglomerate, calcining the agglomerate to activate the alumina, and recovering the agglomerates.
Claim 4
Independent Claim
104 words
A method for the preparation of adsorbent agglomerates consisting essentially of molecular sive grains and an inorganic binder of activated alumina in admixture with the grains, comprising the steps of mixing the molecular sieve grains with a partially dehydrated alumina prepared by contacting an alumina hydrate in a current of hot gas at a temperature within the range of 400* to 1000*C for a time ranging from a fraction of a second up to 10 seconds, agglomerating the mixture, exposing the agglomerate to moisture to age and harden the alumina, drying the agglomerate, calcining the agglomerate to activate the alumina, and recovering the agglomerates.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |