US3923645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for oxidizing mercaptans occurring in petroleum refining streams
Assignee: Hilliard Lyons Patent Management Inc
•
Filing: 1973-09-07
•
Granted: 1975-12-02
•
Expires: 1993-09-07
Abstract
Abstract Disclosed is a catalyst and method for converting mercaptans and mercaptide compounds in aqueous alkaline solution to disulfides. Catalytic agent is metal compound of tetrapyridinoporphyrazine (TPPA) perferably impregnated on an inert granular support. Method comprises contacting mercaptans and mercaptide compounds in aqueous alkaline solution with air in the presence of the catalyst and subsequently separating alkaline solution from the resultant disulfide compounds.
Inventors
- 👤 Jr Gilbert P Anderson
- 👤 Clifford Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:45
CPC Classifications
C; C10; C10G; C10G27/00; C10G27/04; C10G27/10; B; B01; B01J; B01J31/00; B01J31/16; B01J31/1616; B01J31/18; B01J31/1805; B01J31/181; B01J31/1825; B01J31/183; C07; C07C; C07C319/00; C07C319/22; C07C319/24; B01J2531/00; B01J2531/02; B01J2531/0238; B01J2531/0241; B01J2531/025; B01J2531/50; B01J2531/56; B01J2531/80; B01J2531/84; B01J2531/845
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
A METHOD FOR OXIDIZING MERCAPTANS OCCURING IN PETROLEUM REFINING STREAMS AND ALKALI MERCAPTIDE COMPOUNDS RESULTING FROM CONTACTING AQUEUS CAUSTIC SOLUTIONS WITH PETROLEUM REFINING STREAMS CONTAINING AQUEOUS CAUSTIC SOLUTIONS WITH P SPONDING DISULFIDE COMPOUNDS COMPRISING CONTACTING SAID MERCAPTAN AND MERCAPTIDE COMPOUNDS IN AN AQUEOUS ALKALINE SOLUTION WITH A GASEOUS OXIDIZING AGENT IN THE PRESENCE OF A CATALYST COMPRISING A METAL COMPLEX OF TEETRAPYRIDINOPORPHYRAZINE SUPPORTED ON A SOLID GANULAR INERT CARRIER AND HAVING THE STRUCTURAL FORMULA: TETRAPYRIDINOPORPHYRAZINE M WHERE M IS A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, MANGANESE, CHROMIUM, MAGNESIUM, COPPER, NICKEL, ZINC, TITAMONY, BISMUTH, MOLYBDENUM, PALLADIUM, PLATINUM, SILVER, MONY, BISMUTY, MOLYBDENUM, PALLADIUM, PLATINUM, SILVER, MERCURY, VANADIUM AND COBALT.
Claim 2
Independent Claim
110 words
A METHOD FOR OXIDIZING MERCAPTANS OCCURING IN PETROLEUM REFINING STREAMS AND ALKALI MERCAPTIDE COMPOUNDS RESULTING FROM CONTACTING AQUEUS CAUSTIC SOLUTIONS WITH PETROLEUM REFINING STREAMS CONTAINING AQUEOUS CAUSTIC SOLUTIONS WITH P SPONDING DISULFIDE COMPOUNDS COMPRISING CONTACTING SAID MERCAPTAN AND MERCAPTIDE COMPOUNDS IN AN AQUEOUS ALKALINE SOLUTION WITH A GASEOUS OXIDIZING AGENT IN THE PRESENCE OF A CATALYST COMPRISING A METAL COMPLEX OF TEETRAPYRIDINOPORPHYRAZINE SUPPORTED ON A SOLID GANULAR INERT CARRIER AND HAVING THE STRUCTURAL FORMULA: TETRAPYRIDINOPORPHYRAZINE M WHERE M IS A METAL SELECTED FROM THE GROUP CONSISTING OF IRON, MANGANESE, CHROMIUM, MAGNESIUM, COPPER, NICKEL, ZINC, TITAMONY, BISMUTH, MOLYBDENUM, PALLADIUM, PLATINUM, SILVER, MONY, BISMUTY, MOLYBDENUM, PALLADIUM, PLATINUM, SILVER, MERCURY, VANADIUM AND COBALT.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said metal M is cobalt.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said metal M is vanadium.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the concentration of metal complex of tetrapyradinoporphyrazine is at least 0.5% by weight of said catalyst.
Claim 6
Dependent Claim
75 words
The method of claim 1 wherein said contacting is conducted at a pressure of between about 10 and about 100 psig, a temperature of between about 50* and about 150*F, a liquid-hourly-space velocity of between 0.1 and about 20 volumes of aqueous alkaline solution per volume of catalyst per hour and a ratio of between about 0.25 and about 1 mole of oxygen in said oxidizing gas per mole of mercaptan and alkali mercaptide compounds.
Claim 7
Dependent Claim
19 words
The method of claim 1 and the additional step of separating oxidized mercaptide compounds from said aqueous alkaline solution.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said gaseous oxidizing agent is air.
Claim 9
Independent Claim
136 words
A method for oxidizing mercaptans occurring in petroleum refining streams and alkali mercaptide compounds resulting from contacting aqueous caustic solutions with petroleum refining streams containing mercaptans comprising contacting said mercaptans and mercaptide compounds in an aqueous solution of sodium hydroxide with air in a ratio of at least 0.25 moles of oxygen in said air per mole of mercaptide and mercaptans, at a pressure of between about 10 psig and about 100 psig, a temperature of between about 50* and about 150*F, a liquid-space-velocity of between about 0.1 and about 20 volumes of aqueous caustic per volume of catalyst per hour, in the presence of a catalyst comprising the metal compound of tetrapyridinoporphyrazine impregnated on granular activated carbon in an amount of at least 0.5 percent by weight of the catalyst And having the structural formula:
Claim 10
Independent Claim
136 words
A method for oxidizing mercaptans occurring in petroleum refining streams and alkali mercaptide compounds resulting from contacting aqueous caustic solutions with petroleum refining streams containing mercaptans comprising contacting said mercaptans and mercaptide compounds in an aqueous solution of sodium hydroxide with air in a ratio of at least 0.25 moles of oxygen in said air per mole of mercaptide and mercaptans, at a pressure of between about 10 psig and about 100 psig, a temperature of between about 50* and about 150*F, a liquid-space-velocity of between about 0.1 and about 20 volumes of aqueous caustic per volume of catalyst per hour, in the presence of a catalyst comprising the metal compound of tetrapyridinoporphyrazine impregnated on granular activated carbon in an amount of at least 0.5 percent by weight of the catalyst And having the structural formula:
Claim 11
Dependent Claim
21 words
The method of claim 8 wherein said catalyst contains both cobalt and vanadium compounds of tetrapyridinoporphyrazine impregnated on granular activated carbon.
Claim 12
Independent Claim
49 words
A method for oxidizing mercaptans present in a liquid petroleum hydrocarbon distillate comprising contacting said liquid hydrocarbon distillate with an oxidizing gas in an alkaline solution in the presence of a catalyst comprising a metal compound of tetrapyridinoporphyrazine impregnated on a granular inert carrier and having the structural formula:
Claim 13
Independent Claim
49 words
A method for oxidizing mercaptans present in a liquid petroleum hydrocarbon distillate comprising contacting said liquid hydrocarbon distillate with an oxidizing gas in an alkaline solution in the presence of a catalyst comprising a metal compound of tetrapyridinoporphyrazine impregnated on a granular inert carrier and having the structural formula:
References Cited (Backward Citations)
US2853432A
Cited
US2921020A
Cited
US2966453A
Cited
US3143574A
Cited
US3252892A
Cited
US3686094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |