US4101631A
Expired / Lapsed
US
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Selective adsorption of mercury from gas streams
Assignee: Union Carbide Corp
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Filing: 1976-11-03
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Granted: 1978-07-18
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Expires: 1996-11-03
Abstract
Abstract Mercury vapor is selectively chemisorbed from gas streams by contact with zeolitic molecular sieves containing elemental sulfur. The selectivity and capacity of the zeolite adsorbent in the process is not affected adversely by the presence of adsorbed water vapor or water vapor in the gas stream being treated.
Inventors
- 👤 Ronald Frank Ambrosini
- 👤 Richard Alan Anderson
- 👤 Louis Leonard Fornoff
- 👤 Krishan Dayal Manchanda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/64; B01D53/02; B01D2253/00; B01D2253/10; B01D2253/106; B01D2253/108; B01D2257/00; B01D2257/60; B01D2257/602
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
Process for removing mercury vapor from gas streams which comprises providing a gas stream containing water vapor and at least 0.02 micrograms of mercury vapor per normal cubic meter, passing said gas stream at a temperature of from -40° to 100° C. through a sorption zone containing a crystalline zeolitic molecular sieve having a SiO 2 /Al 2 O 3 molar ratio of from 2 to 20, and having elemental sulfur loaded thereon in an amount of at least 0.5 weight percent, based on the anhydrous weight of the molecular sieve, whereby mercury is adsorbed from said gas stream, and recovering the mercury-depleted effluent gas stream from said sorption zone.
Claim 2
Dependent Claim
110 words
Process for removing mercury vapor from gas streams which comprises providing a gas stream containing water vapor and at least 0.02 micrograms of mercury vapor per normal cubic meter, passing said gas stream at a temperature of from -40° to 100° C. through a sorption zone containing a crystalline zeolitic molecular sieve having a SiO 2 /Al 2 O 3 molar ratio of from 2 to 20, and having elemental sulfur loaded thereon in an amount of at least 0.5 weight percent, based on the anhydrous weight of the molecular sieve, whereby mercury is adsorbed from said gas stream, and recovering the mercury-depleted effluent gas stream from said sorption zone.
Claim 3
Dependent Claim
12 words
Process according to claim 1 wherein the gas stream is natural gas.
Claim 4
Dependent Claim
21 words
Process according to claim 1 wherein the gas stream contains at least 2 micrograms of mercury vapor per normal cubic meter.
Claim 5
Dependent Claim
23 words
Process according to claim 3 wherein the crystalline zeolite contains in addition to the sulfur loading at least 2 weight percent adsorbed water.
Claim 6
Dependent Claim
17 words
Process according to claim 3 wherein the crytalline zeolitic molecular sieve has a faujasite type crystal structure.
Claim 7
Dependent Claim
12 words
Process according to claim 5 wherein the molecular sieve is zeolite X.
Claim 8
Dependent Claim
12 words
Process according to claim 5 wherein the molecular sieve is zeolite Y.
Claim 9
Dependent Claim
63 words
Process according to claim 5 wherein the cations electrovalently balancing the net negative charge on the AlO 4 -tetrahedra of the zeolite structure consist essentially of one or a mixture of at least two of cations selected from the group consisting of Na + , K + , Li + , Ca ++ , Ba ++ , Mg ++ and Sr ++ .
References Cited (Backward Citations)
US3876393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |