US5004588A
Expired / Lapsed
US
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Process for removal of hydrogen sulfide from gaseous stream
Assignee: Chevron USA Inc
•
Filing: 1990-06-01
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Granted: 1991-04-02
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Expires: 2010-06-01
Abstract
Abstract This invention provides a process for removing H 2 S from the gaseous stream by contacting the stream with an aqueous solution of a water soluble oxidized polyvalent metal chelate catalyst in the presence of oxygen whereby the metal chelate catalyst oxidizes the hydrogen sulfide to produce elemental sulfur and the oxygen present oxidizes the reduced metal chelate catalyst to its oxidized form. This process is performed in a single reaction vessel and forms a suspension or slurry of the precipitated elemental sulfur which is maintained in suspension by the use of a dispersing agent. The process is continued until the sulfur content reaches a level of 5 percent by weight or 10 percent or more by weight of the solution, then the entire solution is discarded and replaced with a fresh solution and the process repeated. This invention also provides a composition for H 2 S removal comprising a polyvalent metal chelate catalyst, a buffer and a dispersing agent. The dispersing agent preferably keeps the particle size of the precipitated sulfur as small as possible, for example, less than about 15 microns and preferably less than about 5 microns.
Inventors
- 👤 Scott P. Nisula
- 👤 Christopher P. O'Callaghan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:31
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1418; B01D53/1456; B01D53/1468; B01D53/1493; B01D53/34; B01D53/46; B01D53/48; B01D53/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
173 words
A process for removing hydrogen sulfide from a gaseous stream which comprises contacting said hydrogen sulfide containing gaseous stream with an aqueous solution comprising a water soluble oxidized polyvalent metal chelate catalyst to convert the hydrogen sulfide to particulate elemental sulfur and reduce the polyvalent metal chelate catalyst, said contacting taking place in the presence of sufficient oxygen for oxidizing the reduced polyvalent metal chelate catalyst to its oxidized state, wherein the aqueous solution contains an effective amount of a dispersing agent for maintaining the particulate elemental sulfur in dispersed suspension in the aqueous solution, thereby forming a suspension of the particulate elemental sulfur in said aqueous solution, continuing said contacting until the suspended particulate elemental sulfur reaches at least about 2 percent by weight of the aqueous solution, discarding at least a portion of the aqueous solution containing the suspension of particulate elemental sulfur, and replacing the discarded aqueous solution with fresh aqueous solution and said water soluble oxidized polyvalent metal chelate catalyst for contact with additional hydrogen sulfide containing gaseous stream.
Claim 2
Dependent Claim
173 words
A process for removing hydrogen sulfide from a gaseous stream which comprises contacting said hydrogen sulfide containing gaseous stream with an aqueous solution comprising a water soluble oxidized polyvalent metal chelate catalyst to convert the hydrogen sulfide to particulate elemental sulfur and reduce the polyvalent metal chelate catalyst, said contacting taking place in the presence of sufficient oxygen for oxidizing the reduced polyvalent metal chelate catalyst to its oxidized state, wherein the aqueous solution contains an effective amount of a dispersing agent for maintaining the particulate elemental sulfur in dispersed suspension in the aqueous solution, thereby forming a suspension of the particulate elemental sulfur in said aqueous solution, continuing said contacting until the suspended particulate elemental sulfur reaches at least about 2 percent by weight of the aqueous solution, discarding at least a portion of the aqueous solution containing the suspension of particulate elemental sulfur, and replacing the discarded aqueous solution with fresh aqueous solution and said water soluble oxidized polyvalent metal chelate catalyst for contact with additional hydrogen sulfide containing gaseous stream.
Claim 3
Dependent Claim
28 words
A process according to claim 1 wherein said contacting is continued until the particulate elemental sulfur constitutes at least about 4 percent by weight of the aqueous solution.
Claim 4
Dependent Claim
28 words
A process according to claim 2 wherein said contacting is continued until the particulate elemental sulfur constitutes at least about 5 percent by weight of the aqueous solution.
Claim 5
Dependent Claim
27 words
A process according to claim 3 wherein said contacting is continued until the particulate elemental sulfur constitutes at least about 8 percent by of the aqueous solution.
Claim 6
Dependent Claim
154 words
A process for removing hydrogen sulfide from a gaseous stream which comprises contacting said hydrogen sulfide containing gaseous stream with an aqueous solution comprising water soluble oxidized polyvalent metal chelate catalyst to convert the hydrogen sulfide to particulate elemental sulfur and reduce the polyvalent metal chelate catalyst, said contacting taking place in the presence of sufficient oxygen for oxidizing the reduced polyvalent metal chelate catalyst to its oxidized state, thereby forming a suspension of particulate elemental sulfur in said aqueous solution, wherein the aqueous solution contains an effective amount of a dispersing agent for maintaining the particulate elemental sulfur in the form of dispersed particles and maintaining said sulfur particles in dispersed suspension in the aqueous solution in the absence of significant frothing or settling of the particulate sulfur and wherein the dispersed and suspended sulfur particles are present in an amount of at least about 2 percent by weight of the aqueous solution.
Claim 7
Dependent Claim
154 words
A process for removing hydrogen sulfide from a gaseous stream which comprises contacting said hydrogen sulfide containing gaseous stream with an aqueous solution comprising water soluble oxidized polyvalent metal chelate catalyst to convert the hydrogen sulfide to particulate elemental sulfur and reduce the polyvalent metal chelate catalyst, said contacting taking place in the presence of sufficient oxygen for oxidizing the reduced polyvalent metal chelate catalyst to its oxidized state, thereby forming a suspension of particulate elemental sulfur in said aqueous solution, wherein the aqueous solution contains an effective amount of a dispersing agent for maintaining the particulate elemental sulfur in the form of dispersed particles and maintaining said sulfur particles in dispersed suspension in the aqueous solution in the absence of significant frothing or settling of the particulate sulfur and wherein the dispersed and suspended sulfur particles are present in an amount of at least about 2 percent by weight of the aqueous solution.
Claim 8
Dependent Claim
22 words
A process according to claim 5 wherein the sulfur particles constitute at least about 4 percent by weight of the aqueous solution.
Claim 9
Dependent Claim
22 words
A process according to claim 6 wherein the sulfur particles constitute at least about 5 percent by weight of the aqueous solution.
Claim 10
Dependent Claim
21 words
A process according to claim 7 wherein the sulfur particles constitute at about 8 percent by weight of the aqueous solution.
Claim 11
Dependent Claim
21 words
A process according to claim 10 wherein the sulfur particles constitute at about 10 percent by weight of the aqueous solution.
Claim 12
Dependent Claim
150 words
A process for removing hydrogen sulfide from a gaseous stream which comprises contacting said hydrogen sulfide containing gaseous stream with an aqueous solution comprising a water soluble oxidized polyvalent metal chelate catalyst to convert the hydrogen sulfide to particulate elemental sulfur and reduce the polyvalent metal chelate catalyst, said contacting taking place in the presence of sufficient oxygen for oxidizing the reduced polyvalent metal chelate catalyst to its oxidized state, wherein the aqueous solution contains an effective amount of a dispersing agent for maintaining the particulate elemental sulfur in dispersed suspension in the aqueous solution, thereby forming and maintaining in suspension the particulate elemental sulfur in said aqueous solution wherein the average particle size of the particulate elemental sulfur is less than about 15 microns and wherein the amount of dispersed and suspended elemental sulfur present in said solution is at least about 2 percent weight of the aqueous solution.
Claim 13
Dependent Claim
150 words
A process for removing hydrogen sulfide from a gaseous stream which comprises contacting said hydrogen sulfide containing gaseous stream with an aqueous solution comprising a water soluble oxidized polyvalent metal chelate catalyst to convert the hydrogen sulfide to particulate elemental sulfur and reduce the polyvalent metal chelate catalyst, said contacting taking place in the presence of sufficient oxygen for oxidizing the reduced polyvalent metal chelate catalyst to its oxidized state, wherein the aqueous solution contains an effective amount of a dispersing agent for maintaining the particulate elemental sulfur in dispersed suspension in the aqueous solution, thereby forming and maintaining in suspension the particulate elemental sulfur in said aqueous solution wherein the average particle size of the particulate elemental sulfur is less than about 15 microns and wherein the amount of dispersed and suspended elemental sulfur present in said solution is at least about 2 percent weight of the aqueous solution.
Claim 14
Dependent Claim
22 words
A process according to claim 10 wherein the average particle size of the particulate elemental sulfur is less than about 10 microns.
Claim 15
Dependent Claim
22 words
A process according to claim 11 wherein the average particle size of the particulate elemental sulfur is less than about 5 microns.
References Cited (Backward Citations)
US3068065A
Cited
US3097925A
Cited
GB999799A
Cited
US3199946A
Cited
US3622273A
Cited
US3676356A
Cited
US3672125A
Cited
US4036942A
Cited
US3956473A
Cited
US4009251A
Cited
US3933993A
Cited
US4189462A
Cited
US4011304A
Cited
US4100235A
Cited
US4140735A
Cited
US4238462A
Cited
US4278646A
Cited
US4208385A
Cited
US4344863A
Cited
US4444742A
Cited
US4246244A
Cited
US4313917A
Cited
US4374104A
Cited
GB2088839A
Cited
US4414194A
Cited
US4356155A
Cited
US4368178A
Cited
US4401642A
Cited
US4479928A
Cited
US4390516A
Cited
US4400368A
Cited
US4382918A
Cited
US4468929A
Cited
US4431616A
Cited
US4455287A
Cited
US4649032A
Cited
US4525338A
Cited
US4534955A
Cited
US4485083A
Cited
US4547200A
Cited
US4622212A
Cited
US4499059A
Cited
US4515764A
Cited
US4536382A
Cited
US4532118A
Cited
US4769228A
Cited
US4730369A
Cited
US4784775A
Cited
US4880609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |