US4191732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing sulfur dioxide from gases
Assignee: Phillips Petroleum Co
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Filing: 1977-11-15
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Granted: 1980-03-04
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Expires: 1997-11-15
Abstract
Abstract Sulfur dioxide is removed from a sulfur dioxide-containing gas mixture by contacting the gas mixture with a monoolefin or diolefin.
Inventors
- 👤 Carl A. Uraneck
- 👤 Paul H. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:39
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
143 words
A process for removing sulfur dioxide (SO 2 ) from an SO 2 -containing gaseous stream comprising: (a) contacting a initial SO 2 -containing gaseous stream and at least one suitable hydrocarbon comprising monoolefins, diolefins, and mixtures thereof so as to form an essentially SO 2 -free gaseous stream and at least a first sulfur compound selected from the group consisting of sulfones, SO 2 -containing copolymers and mixtures thereof (b) separating said first sulfur compound from said essentially SO 2 -free gaseous stream; (c) thermally dissociating at least a portion of said first sulfur compound in a heating zone so as to generate a product mixture comprising SO 2 and said hydrocarbon; (d) separating said hydrocarbon and said SO 2 by fractionating said product mixture in a fractionation zone; and (e) recycling said hydrocarbon to the initial SO 2 -containing gaseous stream.
Claim 2
Dependent Claim
143 words
A process for removing sulfur dioxide (SO 2 ) from an SO 2 -containing gaseous stream comprising: (a) contacting a initial SO 2 -containing gaseous stream and at least one suitable hydrocarbon comprising monoolefins, diolefins, and mixtures thereof so as to form an essentially SO 2 -free gaseous stream and at least a first sulfur compound selected from the group consisting of sulfones, SO 2 -containing copolymers and mixtures thereof (b) separating said first sulfur compound from said essentially SO 2 -free gaseous stream; (c) thermally dissociating at least a portion of said first sulfur compound in a heating zone so as to generate a product mixture comprising SO 2 and said hydrocarbon; (d) separating said hydrocarbon and said SO 2 by fractionating said product mixture in a fractionation zone; and (e) recycling said hydrocarbon to the initial SO 2 -containing gaseous stream.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein said first sulfur compound is a solid when it is separated from said essentially SO 2 -free gaseous stream.
Claim 4
Dependent Claim
36 words
A process according to claim 1 wherein the separated SO 2 is reacted under conditions so as to form at least one second sulfur compound selected from the group consisting of sulfur trioxide and elemental sulfur.
Claim 5
Dependent Claim
21 words
A process according to claim 3 wherein said SO 2 containing gaseous stream and said hydrocarbon are compressed prior to contact.
Claim 6
Dependent Claim
11 words
A process according to claim 4 wherein said process is continuous.
Claim 7
Dependent Claim
11 words
A process according to claim 5 wherein said hydrocarbon is isoprene.
Claim 8
Dependent Claim
24 words
A process according to claim 1 wherein the separated SO 2 is liquefied and used as a solvent for the recovery of aromatic hydrocarbons.
Claim 9
Dependent Claim
37 words
A process according to claim 7 wherein the amount of said hydrocarbon is slightly less than the stoichiometric amount which would be required to react with all the SO 2 in said SO 2 -containing gaseous stream.
Claim 10
Dependent Claim
24 words
A process according to claim 1 wherein said hydrocarbon and said SO 2 are gaseous when they react to form said first sulfur compound.
Claim 11
Dependent Claim
26 words
A process according to claim 1 wherein a portion of the first sulfur compound is recovered in the fractionation zone and recycled to the heating zone.
Claim 12
Dependent Claim
18 words
A process according to claim 1 wherein the SO 2 -containing gaseous stream is a flue gas stream.
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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |