US3721066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of acid gases
Assignee: Research Cottrell Inc
•
Filing: 1970-12-29
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Granted: 1973-03-20
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Expires: 1990-12-29
Abstract
Abstract A process for removing an acid gas component from a gas stream is shown. The gas is passed in contact with finely divided nepheline syenite which selectively sorbs acid components such as hydrogen fluoride, sulfur dioxide and silicon tetrafluoride from the gas. The nepheline syenite is desirably treated with water to increase its sorbant characteristics.
Inventors
- 👤 A Teller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01D; B01D53/00; B01D53/02; B01D53/025; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; B01D53/68; C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
24 words
A process according to claim 1 wherein said acid gas is selected from the group consisting of hydrogen fluoride, silicon tetrafluoride and sulfur dioxide.
Claim 2
Dependent Claim
23 words
A process according to claim 1 wherein the said nepheline syenite is in the form of particles of from 4 to 500 mesh.
Claim 3
Dependent Claim
39 words
A process according to claim 1 wherein said gas stream is at a temperature of from 100* to 400*F. and is passed in contact with said nepheline syenite at a space velocity of from 102 to 107 hr. 1.
Claim 4
Dependent Claim
96 words
A process for selectively sorbing an acid gas component selected from the group consisting of hydrogen fluoride, silicon tetrafluoride and sulfur dioxide from a gas stream, comprising the steps of: passing said gas stream at a temperature of from 100* to 400*F. and at a space velocity of from 102 to 107 hr. 1 in contact with finely divided nepheline syenite having a particle size of 4 to 500 mesh, said nepheline syenite having first been treated with water; and removing a gas stream from said bed from which said acid component has been selectively sorbed.
Claim 5
Dependent Claim
45 words
A process according to claim 5 wherein said nepheline syenite is first treated with from 10 to 50 pounds of water per 100 pounds of nepheline syenite and then dried in order to increase the sorbant characteristics of said syenite for said acid gas components.
Claim 6
Dependent Claim
14 words
A process according to claim 5 wherein said acid gas component is hydrogen fluoride.
Claim 7
Dependent Claim
14 words
A process according to claim 5 wherein said acid gas component is sulfur dioxide.
Claim 8
Dependent Claim
37 words
A process for improving the sorbant characteristics of nepheline syenite with respect to acid gases, comprising the steps of: treating said nepheline syenite with water so as to adsorb water thereon and thereafter drying said nepheline syenite.
Claim 9
Dependent Claim
24 words
A process according to claim 9 wherein said nepheline syenite is treated with 10 to 50 pounds of water per 100 pounds of syenite.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |