US3658477A
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Process for purifying a gas containing hydrogen sulfide with production of sulfur
Assignee: IFP Energies nouvelles
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Filing: 1968-09-05
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Granted: 1972-04-25
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Expires: 1988-09-05
Abstract
Abstract A process for purifying a gas containing hydrogen sulfide as the impurity, with the production of sulfur as a by-product which comprises contacting a gas containing hydrogen sulfide with a liquid phase containing at least one phosphoric acid ester and at least one alkanolamine, separating the purified gas free of hydrogen sulfide and treating the resulting solution containing hydrogen sulfide with a molecular oxygen-containing gas and separating sulfur therefrom.
Inventors
- 👤 Philippe Renault
- 👤 Henri Gruhier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:27
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52; B01D53/523
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
A process according to claim 1, wherein the reaction is carried out in two steps wherein the first one consists of contacting the impure gas with the mixture of an alkanolamine and a phosphoric acid ester, and the second one consists of treating the resulting solution, separated from the purified gas, with the molecular oxygen-containing gas.
Claim 2
Dependent Claim
36 words
A process according to claim 1, wherein the alkanolamine is used in an amount of about 0.1 to 50 percent with respect to the weight of the mixture of the phosphoric acid ester and the alkanolamine.
Claim 3
Dependent Claim
29 words
A process according to claim 1, wherein the step of contacting the gas with phosphoric acid ester and the step of oxidizing the resulting solution are carried out simultaneously.
Claim 4
Dependent Claim
80 words
The process of claim 1, wherein the phosphoric acid ester is of the general formula PO(OR)3 wherein R is selected from the group consisting of a monovalent hydrocarbon radical containing about three to 20 carbon atoms and a radical of the formula -(R1-O)n-R2 where R1 is a hydrocarbon radical containing two or three carbon atoms, R2 is a hydrogen atom or a hydrocarbon radical containing one to five carbon atoms and n is an integer of 1, 2 or 3.
Claim 5
Dependent Claim
50 words
The process of claim 5, wherein the phosphoric acid ester is selected from the group consisting of the tributyl ester of orthophosphoric acid, the triisobutyl ester of orthophosphoric acid, the tricresyl ester of orthophosphoric acid, the tricyclohexyl ester of orthophosphoric acid, monocyclohexyl di-n propyl orthophosphate and tri (butoxy-2 ethyl) phosphate.
Claim 6
Dependent Claim
92 words
The process of claim 1, wherein the alkanolamine is of the general formula wherein at least one of the R groups is a group of the formula -CpH2p-OH where p is an integer from 2 to 6, and the other R groups are selected from the group consisting of a hydrogen atom, an alkyl group containing one to 18 carbon atoms, and -Cr H2r -OH group where r is an integer from 2 to 6, the CpH2p and CrH2r groups also capable of containing an internal -O- bond between two carbon atoms.
Claim 7
Dependent Claim
29 words
The process of claim 7, wherein the alkanolamines are selected from the group consisting of N-methyl diethanolamine, diethanolamine, diisopropanolamine, monoethanolamine, di-n propanolamine, triethanolamine, N-butyl diethanolamine, N-methyl diisopropanolamine and aminoethoxyethanol.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |