Patent US3725252A successfully refreshed from Google Patents.
US3725252A
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US
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Desulfurization with subsequent h{11 s absorption
Assignee: Universal Oil Products Co
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Filing: 1970-07-27
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Granted: 1973-04-03
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Expires: 1990-07-27
Abstract
Abstract Process for removal of a selected constituent from a vapor stream which comprises contacting the vapor stream in a high pressure absorption zone with a first stream of lean absorbent, mixing the resulting rich absorbent with a second stream of lean absorbent in a low pressure contacting zone, and separating the resulting mixture in a separation zone under conditions sufficient to provide selected constituent and separated lean absorbent. In a preferred embodiment, the separation zone comprises a phase separator and a low pressure absorption zone, the resulting mixture is passed from the low pressure contacting zone into the phase separator, and a resulting vapor stream is passed from the phase separator into the low pressure absorber wherein it is contacted with a third lean absorbent stream. The process has particular utility in the removal of selected constituent, such as an acid gas or mixture of acid gases, in a high pressure absorption zone maintained at a pressure in excess of 1,000 psig. Particular application is in the removal of hydrogen sulfide from a hydrogenation reaction zone, such as a hydrotreating zone or a hydrocracking zone, wherein a hydrocarbon charge stock containing organic sulfur compounds is desulfurized.
Inventors
- 👤 W Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:10
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1456; C; C10; C10G; C10G49/00; C10G49/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
Process of claim 1 wherein said separation zone comprises a phase separator and said low pressure absorption zone, said second rich absorbent stream is passed into said phase separator under conditions sufficient to provide a third vapor stream and a third rich absorbent, said third vapor stream is contacted in said low pressure absorption zone with a third portion of separated lean absorbent under conditions sufficient to provide a fourth rich absorbent and a fourth vapor stream having substantial freedom from selected constituent, and said third rich absorbent and said fourth rich absorbent are separated under conditions sufficient to provide said separated lean absorbent.
Claim 2
Dependent Claim
34 words
Process of claim 1 wherein the ratio of said first portion of separated lean absorbent to said second portion of separated lean absorbent is in the range of from about 7:3 to about 3:7.
Claim 3
Dependent Claim
20 words
Process of claim 1 wherein said high pressure absorption zone is maintained at a pressure of at least 1,000 psig.
Claim 4
Dependent Claim
25 words
Process of claim 4 wherein said selected constituent comprises an acid gas selected from the group consisting of hydrogen sulfide, carbon dioxide, and carbonyl sulfide.
Claim 5
Dependent Claim
31 words
Process of claim 5 wherein said lean absorbent comprises an amine absorbent selective for said acid gas, said amine absorbent selected from the group consisting of monoethanolamine, diethanolamine, diglycolamine, and aminodiisopropanol.
Claim 6
Dependent Claim
17 words
Process of claim 6 wherein said high pressure absorption zone is maintained at a temperature below 200*F.
Claim 7
Dependent Claim
303 words
In a hydrogenation process wherein a hydrocarbon charge stock containing organic sulfur compounds is reacted in a high pressure reaction zone with a stoichiometric excess of hydrogen under desulfurization conditions including the presence of a hydrogenation catalyst selective for desulfurizing organic sulfur compounds, a resulting reaction zone effluent is separated into a hydrocarbon liquid phase and into a hydrogen-rich vapor phase containing hydrogen sulfide, and said hydrogen-rich vapor phase is returned at least in part to said reaction zone, the improvement which comprises: a. contacting at least a portion of said hydrogen-rich vapor phase in a high pressure absorption zone, with a hereinafter specified first stream of lean absorbent selective for hydrogen sulfide; b. removing from said absorption zone, a hydrogen-rich vapor stream having reduced concentration of hydrogen sulfide; c. withdrawing from said absorption zone, a first rich absorbent containing hydrogen sulfide; d. mixing said first rich absorbent with a hereinafter specified second stream of said lean absorbent in a low pressure liquid-liquid contacting zone of high turbulence under conditions sufficient to provide a reduced mole ratio of hydrogen sulfide to absorbent in a resulting second rich absorbent; e. passing said resulting second rich absorbent from said contacting zone into a separation zone which includes a low pressure absorption zone, said separation zone maintained under conditions sufficient to provide a stream comprising hydrogen sulfide and a stream comprising separated lean absorbent; f. passing a first portion of separated lean absorbent into said high pressure absorption zone as said specified first stream of lean absorbent; g. passing a second portion of said separated lean absorbent into said low pressure contacting zone as said specified second stream of lean absorbent; and, h. passing from said high pressure absorption zone into said high pressure reaction zone, said hydrogen-rich vapor stream having reduced concentration of hydrogen sulfide.
Claim 8
Dependent Claim
26 words
Process of claim 8 wherein said high pressure reaction zone and said high pressure absorption zone are maintained at a pressure in excess of 1000 psig.
Claim 9
Dependent Claim
32 words
Process of claim 8 wherein said lean aBsorbent comprises an organic amine compound selective for hydrogen sulfide, said organic amine compound selected from the group consisting of monethanolamine, diethanolamine, diglycolamine, and aminodiisopropanol.
Claim 10
Dependent Claim
103 words
Process of claim 8 wherein said separation zone comprises a phase separator and said low pressure absorption zone, said second rich absorbent is passed into said phase separator under conditions sufficient to provide a separated vapor stream and a third rich absorbent, said separated vapor stream is contacted in said low pressure absorption zone with a third portion of separated lean absorbent under conditions sufficient to provide a fourth rich absorbent and a contacted vapor stream having substantial freedom from hydrogen sulfide, and said third rich absorbent and said fourth rich absorbent are separated under conditions sufficient to provide said separated lean absorbent.
Claim 11
Dependent Claim
34 words
Process of claim 8 wherein the ratio of said first portion of separated lean absorbent to said second portion of separated lean absorbent is in the range of from about 7:3 to about 3:7.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |