US4128619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for desulfurization using particulate zinc oxide shapes of high surface area and improved strength
Assignee: Manufacturers Hanover Trust Co
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Filing: 1978-01-13
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Granted: 1978-12-05
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Expires: 1998-01-13
Abstract
Abstract A desulfurization process is provided using particulate zinc oxide shapes of high surface area and improved crushing strength prepared without extraneous binder by a process including forming normal surface area zinc oxide into shapes without binder, converting at least a portion of the zinc oxide to basic zinc carbonate by exposing the shapes in the presence of moisture, to a carbon dioxide-containing atmosphere and effecting substantially complete decomposition of the basic zinc carbonate. Conditions of bulk density, moisture content and temperature are controlled.
Inventors
- 👤 Victor S. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:19
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01J; B01J20/00; B01J20/02; B01J20/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
A process for desulfurizing sulfur-containing gases, said process including the steps of: a. providing a bed of high surface area and high crush strength particulate zinc oxide formed by the steps of: (1) forming normal zinc oxide having a specific surface area less than 10 square meters per gram into pre-determined shapes without the addition of extraneous binding material; (2) exposing said normal zinc oxide shapes to a carbon dioxide-containing atmosphere including water vapor; (3) converting at least about 45% of said zinc oxide into basic zinc carbonate; and (4) decomposing substantially all of said basic zinc carbonate into particulate zinc oxide shapes such that said particulate zinc oxide shapes have a crushing strength between about five and about thirty times greater than the crushing strength of the pre-determined zinc oxide shapes; b. passing said sulfur containing gas over said bed in order to remove the sulfur from said gas; and c. collecting said desulfurized gas.
Claim 2
Dependent Claim
156 words
A process for desulfurizing sulfur-containing gases, said process including the steps of: a. providing a bed of high surface area and high crush strength particulate zinc oxide formed by the steps of: (1) forming normal zinc oxide having a specific surface area less than 10 square meters per gram into pre-determined shapes without the addition of extraneous binding material; (2) exposing said normal zinc oxide shapes to a carbon dioxide-containing atmosphere including water vapor; (3) converting at least about 45% of said zinc oxide into basic zinc carbonate; and (4) decomposing substantially all of said basic zinc carbonate into particulate zinc oxide shapes such that said particulate zinc oxide shapes have a crushing strength between about five and about thirty times greater than the crushing strength of the pre-determined zinc oxide shapes; b. passing said sulfur containing gas over said bed in order to remove the sulfur from said gas; and c. collecting said desulfurized gas.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said bed is maintained at a temperature of about 340° C.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said gas is passed over said bed at a space velocity up to about 1350 hr. -1 .
Claim 5
Dependent Claim
55 words
The process of claim 1 wherein said particulate zinc oxide shapes have: a. a specific surface area between about 30 and about 50 square meters per gram; b. a crushing strength of between about 1500 and about 2710 grams; and c. a bulk density of between about 50 and about 90 pounds per cubic foot.
Claim 6
Dependent Claim
110 words
A process for desulfurizing sulfur-containing gases, said process including the step of: (a) providing a bed of particulate zinc oxide, said particulate zinc oxide having been formed into pre-determined shapes without an extraneous binder material, wherein each of said particulate oxide shapes have: (1) a specific surface area of between about 30 and 50 square meters per gram; (2) a crushing strength of between about 1500 and about 2710 grams; and (3) a bulk density of between about 50 and about 90 lbs. per cubic foot; (b) passing said sulfur containing gas over said bed in order to remove the sulfur from said gas; and (c) collecting said desulfurized gas.
Claim 7
Dependent Claim
110 words
A process for desulfurizing sulfur-containing gases, said process including the step of: (a) providing a bed of particulate zinc oxide, said particulate zinc oxide having been formed into pre-determined shapes without an extraneous binder material, wherein each of said particulate oxide shapes have: (1) a specific surface area of between about 30 and 50 square meters per gram; (2) a crushing strength of between about 1500 and about 2710 grams; and (3) a bulk density of between about 50 and about 90 lbs. per cubic foot; (b) passing said sulfur containing gas over said bed in order to remove the sulfur from said gas; and (c) collecting said desulfurized gas.
Claim 8
Dependent Claim
140 words
A process for desulfurizing sulfur containing gases, said process including the steps of: (a) providing a bed of particulate zinc oxide, said particulate zinc oxide having been formed into pre-determined shapes without an extraneous binder material, wherein each of said particulate zinc oxide shapes have: (1) a specific surface area of between about 30 and about 50 square meters per gram; (2) a crushing strength of between about 1500 and about 2710 grams; and (3) a bulk density of between about 50 and about 90 lbs. per cubic foot; (b) maintaining said bed at a temperature of between about 200° C. and about 400° C.; (c) passing said sulfur containing gas over said bed at a space velocity of up to about 1350 hr. -1 in order to remove the sulfur from said gas; and (d) collecting said desulfurized gas.
Claim 9
Dependent Claim
140 words
A process for desulfurizing sulfur containing gases, said process including the steps of: (a) providing a bed of particulate zinc oxide, said particulate zinc oxide having been formed into pre-determined shapes without an extraneous binder material, wherein each of said particulate zinc oxide shapes have: (1) a specific surface area of between about 30 and about 50 square meters per gram; (2) a crushing strength of between about 1500 and about 2710 grams; and (3) a bulk density of between about 50 and about 90 lbs. per cubic foot; (b) maintaining said bed at a temperature of between about 200° C. and about 400° C.; (c) passing said sulfur containing gas over said bed at a space velocity of up to about 1350 hr. -1 in order to remove the sulfur from said gas; and (d) collecting said desulfurized gas.
References Cited (Backward Citations)
US3441370A
Cited
US4071609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |