US3624003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolitic desiccant bodies and process for preparing same
Assignee: Union Carbide Corp
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Filing: 1969-07-24
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Granted: 1971-11-30
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Expires: 1989-07-24
Abstract
Abstract Adsorbent bodies suitable for use in drying refrigerants comprise an agglomerate core of zeolitic molecular sieve crystals having thereon over substantially its entire outer surface a hardened permeable coating of a thermally deactivated boehmite alumina, said coating being hardened by having impregnated therein cured potassium silicate.
Inventors
- 👤 Robert Mark Conde
- 👤 Wilfred Drost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:32
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/183
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
Process according to claim 1 wherein the initial agglomerate comprises molecular sieve crystals bonded with clay, said clay comprising from about 5 to about 35 weight percent of the initial agglomerate.
Claim 2
Dependent Claim
74 words
Process according to claim 2 wherein the boehmite alumina particles coated on the initial agglomerate have a particle size smaller than 300 mesh, U.S. standard sieve, the potassium silicate solution has a potassium oxide to silicon dioxide ratio of from about 0.477 to about 0.40, and the quantity of potassium silicate solution employed to impregnate the alumina coated agglomerate is from about 0.03 to about 0.07 pounds of solution solid per pound of agglomerate.
Claim 3
Dependent Claim
23 words
Process according to claim 3 wherein the coating of alumina particles has a thickness of from about 1 micron to about 0.003 inch.
Claim 4
Dependent Claim
14 words
Process according to claim 4 wherein the zeolitic molecular sieve crystals comprise zeolite A.
Claim 5
Dependent Claim
25 words
Process according to claim 5 wherein the zeolite A is the potassium exchanged form of zeolite A having uniform pore diameters of about 3 Angstrom.
Claim 6
Dependent Claim
13 words
The molecular size agglomerate prepared in accordance with the process of claim 1.
Claim 7
Dependent Claim
13 words
The molecular sieve agglomerate prepared in accordance with the process of claim 6.
References Cited (Backward Citations)
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US3301788A
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |