Patent US4192857A successfully refreshed from Google Patents.
US4192857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphur production
Assignee: Societe Nationale Elf Aquitaine Production SA
•
Filing: 1977-11-14
•
Granted: 1980-03-11
•
Expires: 1997-11-14
Abstract
Abstract The Claus process for the production of sulphur is improved by employing a deoxidation catalyst prior to the conventional Claus oxide catalyst.
Inventors
- 👤 Jacques Tellier
- 👤 Andre Philippe
- 👤 Pierre Mathieu
- 👤 Robert Voirin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:24
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0426; B01J35/61; B01J35/615; B01J35/63; B01J35/633
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
159 words
A Claus process for the production of sulphur by the action of H 2 S on SO 2 in the presence of an oxide catalyst which comprises contacting a gas containing H 2 S and SO 2 and 50-5000 vpm O 2 in at least one catalytic reaction zone containing a deoxidation catalyst and a Claus oxide catalyst such that said gas encounters for 0.1-3 seconds NTP the deoxidation catalyst prior to encountering the Claus oxide catalyst, said deoxidation catalyst consisting of a supported metal compound of at least one metal selected from the group consisting of iron, nickel, cobalt, copper and zinc, the support having a surface area of at least 100 m 2 /g and a porosity of at least 0.2 ml/g, said deoxidation catalyst containing about 0.5-10% by weight of metal relative to the Claus oxide catalyst, whereby the magnitude of said Claus catalyst activity degradation with time is retarded by use of said deoxidation catalyst.
Claim 2
Dependent Claim
159 words
A Claus process for the production of sulphur by the action of H 2 S on SO 2 in the presence of an oxide catalyst which comprises contacting a gas containing H 2 S and SO 2 and 50-5000 vpm O 2 in at least one catalytic reaction zone containing a deoxidation catalyst and a Claus oxide catalyst such that said gas encounters for 0.1-3 seconds NTP the deoxidation catalyst prior to encountering the Claus oxide catalyst, said deoxidation catalyst consisting of a supported metal compound of at least one metal selected from the group consisting of iron, nickel, cobalt, copper and zinc, the support having a surface area of at least 100 m 2 /g and a porosity of at least 0.2 ml/g, said deoxidation catalyst containing about 0.5-10% by weight of metal relative to the Claus oxide catalyst, whereby the magnitude of said Claus catalyst activity degradation with time is retarded by use of said deoxidation catalyst.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1, characterised in that the metal compound of the deoxidation catalyst is iron sulphate.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1, characterised in that the support is a silico-aluminate.
Claim 5
Dependent Claim
29 words
A process as claimed in one of claims 1, characterised in that the deoxidation catalyst and the oxide catalyst are used at temperatures below the dewpoint of the sulphur.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 4, characterised in that the deoxidation catalyst is periodically desulphurised by a gas containing H 2 S between 250° and 400° C.
Claim 7
Dependent Claim
27 words
A process as claimed in claim 1 characterised in that the volume of deoxidation catalyst is about 5 to 50% of the volume of the oxide catalyst.
Claim 8
Dependent Claim
53 words
A process as claimed in claim 1 characterised in that in addition to the main sulphur compounds in the form of H 2 S and SO 2 , the gas to be processed also contains secondary sulphur compounds in the form of COS and CS 2 in concentrations less than 5% by volume.
Claim 9
Dependent Claim
37 words
A process as claimed in claim 1 wherein the support has a surface area greater than 150 m 2 /g and wherein the weight of said metal is 2-6% of the weight of said Claus oxide catalyst.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 6 characterized in that the volume of the deoxidation catalyst is 10 to 40% of the volume of the oxide catalyst.
Claim 11
Dependent Claim
19 words
A process as claimed in claim 1 characterized in that the deoxidation catalyst and the oxide catalyst are superposed.
Claim 12
Dependent Claim
37 words
A process as claimed in claim 8 characterized in that the volume of the deoxidation catalyst is 10 to 40% of the volume of the oxide catalyst, and the deoxidation catalyst is ferrous oxide supported on alumina.
References Cited (Backward Citations)
GB189613844A
Cited
GB524345A
Cited
US2787519A
Cited
US3554689A
Cited
US3725531A
Cited
US3939250A
Cited
US3978004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |