US4039478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue gas desulfurization sorbent
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1975-01-10
•
Granted: 1977-08-02
•
Expires: 1995-01-10
Abstract
Abstract Sulfur dioxide is removed from gas mixtures such as flue gas containing the same by contacting the gas mixture with a solid sorbent comprising a porous gamma-alumina base, about 2 to 20 percent by weight (based on alumina) of a coating of a refractory oxide such as titanium dioxide, zirconium dioxide, or silica, and an active material, such as copper oxide, which is capable of selective removal of sulfur oxides from a gas mixture.
Inventors
- 👤 Neville L. Cull
- 👤 Warren M. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:55
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
97 words
A process for preparing alumina base catalysts and sorbents which comprises: a. forming on particles of porous alumina a liquid surface coating containing a hydrolyzable organic compound which forms a refractory oxide on hydrolysis; b. hydrolyzing and calcining said hydrolyzable organic compound to said refractory oxide, thereby forming a coating of said oxide on said alumina base; c. impregnating said coated alumina base with a solution of a decomposable compound of a desired active metal selected from the group consisting of iron and copper; and d. converting said compound to the oxide of the desired active metal.
Claim 2
Dependent Claim
97 words
A process for preparing alumina base catalysts and sorbents which comprises: a. forming on particles of porous alumina a liquid surface coating containing a hydrolyzable organic compound which forms a refractory oxide on hydrolysis; b. hydrolyzing and calcining said hydrolyzable organic compound to said refractory oxide, thereby forming a coating of said oxide on said alumina base; c. impregnating said coated alumina base with a solution of a decomposable compound of a desired active metal selected from the group consisting of iron and copper; and d. converting said compound to the oxide of the desired active metal.
Claim 3
Dependent Claim
16 words
A process according to claim 1 in which said hydrolyzable organic compound is an organometallic compound.
Claim 4
Dependent Claim
20 words
A process according to claim 2 in which said hydrolyzable organic compound is a compound of a Group IV-B metal.
Claim 5
Dependent Claim
14 words
A process according to claim 3 in which said Group IV-B metal is titanium.
Claim 6
Dependent Claim
13 words
A process according to claim 3 in which said Group IV-B is zirconium.
Claim 7
Dependent Claim
16 words
A process according to claim 1 in which said hydrolyzable organic compound is a silicon compound.
Claim 8
Dependent Claim
27 words
A process according to claim 1 in which said hydrolyzable organic compound is an ester of an inorganic acid which has a refractory oxide as its anhydride.
Claim 9
Dependent Claim
29 words
A process according to claim 1 in which said liquid surface coating is formed by immersing said particles of porous alumina in a liquid medium containing said hydrolyzable compound.
Claim 10
Dependent Claim
36 words
A process according to claim 1 in which the immersed particles of porous alumina are heat treated at a temperature of at least about 50° C. but not exceeding the boiling point of said liquid medium.
Claim 11
Dependent Claim
19 words
A process according to claim 1 in which said hydrolyzable organic compound is hydrolyzed in a moist gaseous atmosphere.
Claim 12
Dependent Claim
30 words
A process according to claim 1 in which said liquid surface coating is formed by vapor deposition of said hydrolyzable organic compound on the surfaces of said porous alumina particles.
Claim 13
Dependent Claim
13 words
A process according to claim 1 in which said active metal is copper.
Claim 14
Dependent Claim
77 words
A porous non-acidic solid sorbent for flue gas desulfurization comprising: a. a porous alumina base; b. a coating of about 2% to about 20% by weight, based on said alumina, of a refractory oxide, said oxide being formed in situ by hydrolysis of a hydrolyzable organic compound, the coated alumina base being non-acidic, and c. a material active for the selective removal of sulfur oxides from gas mixtures, said active material being a metal or metal oxide.
Claim 15
Dependent Claim
77 words
A porous non-acidic solid sorbent for flue gas desulfurization comprising: a. a porous alumina base; b. a coating of about 2% to about 20% by weight, based on said alumina, of a refractory oxide, said oxide being formed in situ by hydrolysis of a hydrolyzable organic compound, the coated alumina base being non-acidic, and c. a material active for the selective removal of sulfur oxides from gas mixtures, said active material being a metal or metal oxide.
Claim 16
Dependent Claim
17 words
A composition according to claim 13 in which the refractory oxide coating is a refractory metal oxide.
Claim 17
Dependent Claim
20 words
A composition according to claim 14 in which said refractory metal oxide is an oxide of a Group IV-B metal.
Claim 18
Dependent Claim
14 words
A composition according to claim 15 in which said Group IV-B metal is titanium.
Claim 19
Dependent Claim
14 words
A composition according to claim 15 in which said Group IV-B metal is zirconium.
Claim 20
Dependent Claim
27 words
A composition according to claim 13 in which said refractory oxide is silica, the amount of said silica not exceeding about 5% by weight, based on alumina.
Claim 21
Dependent Claim
14 words
A composition according to claim 13 in which the active material is copper oxide.
References Cited (Backward Citations)
US2943066A
Cited
US3014020A
Cited
US3338666A
Cited
US3502595A
Cited
US3501897A
Cited
US3776854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |