US3953587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zeolite catalyst for dilute acid gas treatment via claus reaction
Assignee: WR Grace and Co
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Filing: 1974-11-27
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Granted: 1976-04-27
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Expires: 1994-11-27
Abstract
Abstract Certain zeolite materials have been found to be effective zeolite adsorbents-catalysts for the adsorption and conversion of sulfuric compounds to elemental sulfur. These zeolites adsorb hydrogen sulfide and sulfur oxides and promote the reaction of these materials so as to produce sulfur. These useful zeolites are the hydrogen forms of the zeolite materials and sodium exchanged hydrogen zeolites, especially mordenite. These zeolite adsorbents-catalysts are very useful for the removal of small amounts of hydrogen sulfide and sulfurous oxide from effluent streams such as effluent streams from Claus reactors.
Inventors
- 👤 Hanju Lee
- 👤 Chang Whan Chi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:04
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0456; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8603; B01D53/8612; B01D53/8615; B01J; B01J20/00; B01J20/30; B01J20/34; B01J20/3408
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A method of decreasing contaminant sulfurous gases consisting of sulfur oxides and hydrogen sulfide from process effluent gas streams containing less than about 5 volume percent of said sulfurous gases comprising contacting said gas stream with a zone containing a sodium exchanged hydrogen zeolite adsorbent-catalyst at a temperature of about 400°F to 700°F whereby said sulfurous gases are converted to elemental sulfur; continuing contact of said gas stream until said zeolite is substantially loaded with said contaminant sulfurous substances; interrupting the flow of said gas stream; heating said zeolite adsorbent to a temperature of about 800°F to 1000°F to volatilize and remove sulfur from said zeolite, thereby regenerating said zeolite; and repeating the step of contacting said gas stream with said zeolite thereby providing for cyclic operation of the process.
Claim 2
Independent Claim
130 words
A method of decreasing contaminant sulfurous gases consisting of sulfur oxides and hydrogen sulfide from process effluent gas streams containing less than about 5 volume percent of said sulfurous gases comprising contacting said gas stream with a zone containing a sodium exchanged hydrogen zeolite adsorbent-catalyst at a temperature of about 400°F to 700°F whereby said sulfurous gases are converted to elemental sulfur; continuing contact of said gas stream until said zeolite is substantially loaded with said contaminant sulfurous substances; interrupting the flow of said gas stream; heating said zeolite adsorbent to a temperature of about 800°F to 1000°F to volatilize and remove sulfur from said zeolite, thereby regenerating said zeolite; and repeating the step of contacting said gas stream with said zeolite thereby providing for cyclic operation of the process.
Claim 3
Dependent Claim
14 words
A method as in claim 1 wherein said zeolite is sodium exchanged hydrogen mordenite.
Claim 4
Dependent Claim
40 words
A method as in claim 2 wherein said gas stream is contacted with said zeolite at a temperature of about 550°F to 650°F and said zeolite is heated to about 850°F to 950°F to remove sulfur and regenerate said zeolite.
Claim 5
Dependent Claim
15 words
A method as in claim 1 wherein said zeolite is sodium exchanged hydrogen zeolite Y.
Claim 6
Dependent Claim
40 words
A method as in claim 4 wherein said gas stream is contacted with said zeolite at a temperature of about 550°F to 650°F and said zeolite is heated to about 850°F to 950°F to remove sulfur and regenerate said zeolite.
Claim 7
Dependent Claim
14 words
A method as in claim 1 wherein said zeolite is sodium exchanged hydrogen ferrierite.
Claim 8
Dependent Claim
40 words
A method as in claim 6 wherein said gas stream is contacted with said zeolite at a temperature of about 550°F to 650°F and said zeolite is heated to about 850°F to 950°F to remove sulfur and regenerate said zeolite.
Claim 9
Independent Claim
149 words
A method for removing hydrogen sulfide and sulfur oxides from process gas streams comprising passing said gas stream into a reactor for contact with an alumina catalyst at a temperature of 500°F to 700°F whereby substantial amounts of said hydrogen sulfide and sulfur oxides react to form elemental sulfur and water; flowing low hydrogen sulfide and sulfur oxide content effluent gas from said reactor to a first condenser to remove vaporous elemental sulfur; flowing the effluent gas from said first condenser to a reactor for contact with a sodium exchanged hydrogen zeolite adsorbent-catalyst at a temperature of 400°F to 700°F whereby hydrogen sulfide and sulfur oxides from said effluent gas by conversion to elemental sulfur and water; flowing a gas containing less than 1000 ppm hydrogen sulfide and sulfur oxides to a second condenser to remove vaporous sulfur, and allowing a substantially cleaned gas to flow to the atmosphere.
Claim 10
Independent Claim
149 words
A method for removing hydrogen sulfide and sulfur oxides from process gas streams comprising passing said gas stream into a reactor for contact with an alumina catalyst at a temperature of 500°F to 700°F whereby substantial amounts of said hydrogen sulfide and sulfur oxides react to form elemental sulfur and water; flowing low hydrogen sulfide and sulfur oxide content effluent gas from said reactor to a first condenser to remove vaporous elemental sulfur; flowing the effluent gas from said first condenser to a reactor for contact with a sodium exchanged hydrogen zeolite adsorbent-catalyst at a temperature of 400°F to 700°F whereby hydrogen sulfide and sulfur oxides from said effluent gas by conversion to elemental sulfur and water; flowing a gas containing less than 1000 ppm hydrogen sulfide and sulfur oxides to a second condenser to remove vaporous sulfur, and allowing a substantially cleaned gas to flow to the atmosphere.
Claim 11
Dependent Claim
37 words
A method as in claim 8 wherein said zeolite is selected from the group consisting of hydrogen mordenite, hydrogen ferrierite, hydrogen zeolite Y, sodium exchanged hydrogen mordenite, sodium exchanged hydrogen ferrierite and sodium exchanged hydrogen zeolite Y.
Claim 12
Dependent Claim
39 words
A method as in claim 9 wherein after said zeolite is loaded with elemental sulfur said zeolite is heated to about 800°F to 1000°F to remove sulfur and regenerate said zeolite for reuse for contact with said effluent gas.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |