US5013335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for sequestering ammonia and the odor associated therewith
Assignee: Honeywell UOP LLC
•
Filing: 1988-09-22
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Granted: 1991-05-07
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Expires: 2008-09-22
Abstract
Abstract Ammonia, particularly aqueous ammonia is sequestered in unexpected large amounts on zeolite molecular sieves having high proportions of silica with respect to alumina in their crystal frameworks. While conventional adsorption mechanisms are to some degree involved, it is apparent from the fact that the characteristic odor of ammonia is not detectable by the human sense of smell over the ammonia-loaded adsorbents indicates that other mechanisms are operable. These properties provide the basis for processes and products which are useful in removing ammonia from an environment to alleviate health hazards or unpleasant odor.
Inventors
- 👤 Bonita K. Marcus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:59
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01D; B01D53/00; B01D53/02; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
Process for sequestering ammonia and the odor associated therewith from the environment which comprises contacting and adsorbing at a temperature of from -25° C. to 100° C. the ammonia with a crystalline siliceous molecular sieve which has been at least partially activated, has the faujasite crystal structure, has pore diameters large enough to adsorb ammonia, has a capacity for adsorbed water not greater than 10 weight percent when measured at 25° C. and a water vapor pressure of 4.6 torr and has a framework SiO 2 /Al 2 O 3 ratio of at least 50, said contacting and adsorbing of said ammonia being to a sufficient degree that residual concentration thereof over the adsorbent are below the detection threshold of the human sense of smell.
Claim 2
Dependent Claim
125 words
Process for sequestering ammonia and the odor associated therewith from the environment which comprises contacting and adsorbing at a temperature of from -25° C. to 100° C. the ammonia with a crystalline siliceous molecular sieve which has been at least partially activated, has the faujasite crystal structure, has pore diameters large enough to adsorb ammonia, has a capacity for adsorbed water not greater than 10 weight percent when measured at 25° C. and a water vapor pressure of 4.6 torr and has a framework SiO 2 /Al 2 O 3 ratio of at least 50, said contacting and adsorbing of said ammonia being to a sufficient degree that residual concentration thereof over the adsorbent are below the detection threshold of the human sense of smell.
Claim 3
Dependent Claim
23 words
Process according to claim 1 wherein the siliceous molecular sieve has a capacity for adsorbed water of not greater than 6 weight percent.
Claim 4
Dependent Claim
29 words
Process according to claim 1 wherein the siliceous molecular sieve is an aluminosilicate having a framework SiO 2 /Al 2 O 3 molar ratio of from 200 to 500.
Claim 5
Dependent Claim
36 words
Process according to claim 1 wherein the siliceous molecular sieve comprises a mixture of a silica polymorph and an aluminosilicate having a framework SiO 2 /Al 2 O 3 molar ratio of from 200 to 500.
Claim 6
Dependent Claim
10 words
Process according to claim 4 wherein the aluminosilicate is LZ-10.
Claim 7
Dependent Claim
136 words
Process for detecting the generation of ammonia by the action of bacteria on nitrogen-containing organic matter which comprises imparting to or maintaining in the environment of the nitrogen-containing organic matter in contact with the said bacteria a crystalline siliceous molecular sieve which has been at least partially activated, has pore diameters large enough to adsorb ammonia, has a capacity for adsorbed water not greater than 10 weight percent when measured at 25° C. and a water vapor pressure of 4.6 torr and has a framework SiO 2 /Al 2 O 3 ratio of at least 50, said molecular sieve containing in the adsorbed state a fragrance readily detected by the human sense of smell whereby any ammonia generated in said environment is adsorbed and displaces the said fragrance as an indication that ammonia is being generated.
Claim 8
Dependent Claim
136 words
Process for detecting the generation of ammonia by the action of bacteria on nitrogen-containing organic matter which comprises imparting to or maintaining in the environment of the nitrogen-containing organic matter in contact with the said bacteria a crystalline siliceous molecular sieve which has been at least partially activated, has pore diameters large enough to adsorb ammonia, has a capacity for adsorbed water not greater than 10 weight percent when measured at 25° C. and a water vapor pressure of 4.6 torr and has a framework SiO 2 /Al 2 O 3 ratio of at least 50, said molecular sieve containing in the adsorbed state a fragrance readily detected by the human sense of smell whereby any ammonia generated in said environment is adsorbed and displaces the said fragrance as an indication that ammonia is being generated.
References Cited (Backward Citations)
US1787875A
Cited
GB776467A
Cited
US3033641A
Cited
US3266973A
Cited
US3683592A
Cited
US3772852A
Cited
US3732326A
Cited
US3723308A
Cited
US3698157A
Cited
US3724170A
Cited
US3789797A
Cited
US3798876A
Cited
JPS5044189A
Cited
US4344851A
Cited
JPS5168967A
Cited
US3960520A
Cited
US4061724A
Cited
US4019879A
Cited
US4019880A
Cited
US4257885A
Cited
US4130484A
Cited
US4090981A
Cited
US4073865A
Cited
US4085704A
Cited
US4331694A
Cited
US4344927A
Cited
US4401572A
Cited
US4309281A
Cited
US4437429A
Cited
US4534775A
Cited
JPS59225790A
Cited
US4677096A
Cited
US4604110A
Cited
US4636373A
Cited
US4648977A
Cited
US4686198A
Cited
US4717483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |