US3839188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrorefined transformer oil and process of manufacture
Assignee: Sunoco Inc
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Filing: 1968-05-22
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Granted: 1974-10-01
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Expires: 1988-05-22
Abstract
Abstract A transformer oil having a sludge-free Doble life of at least 64 hours can be prepared from a severely hydrorefined naphthenic oil having a viscosity from 40 to 200 SUS at 100*F. and an ultraviolet absorptivity of less than 0.04 in the 335 millimicron region by a process comprising increasing the content in the hydrorefined oil of polynuclear hydrocarbons having at least four condensed aromatic rings until the 335 absorptivity is in the range of 0.04 to 2.5. An especially useful novel oil having a sludge-free Doble life of at least 100 hours with a total acid number less than 0.1, which can be prepared by the present process, has a 335 UVA in the range of 0.06 to 2.0 and a composition such that the ratio of the ultraviolet absorptivity at 335 millimicrons to the absorptivity at 330 millimicrons is no less than 1.0, has a sulfur content in the range of 25 to 800 p.p.m. and contains less than 25 p.p.m. of nitrogen.
Inventors
- 👤 I Mills
- 👤 G Dimeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:14
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08K; C08K5/00; C08K5/01; C08J2321/00; C10; C10G; C10G2400/00; C10G2400/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
PROCESS FOR PREPARING A HYDROCARBON OIL, USEFUL AS A TRANSFORMER OIL, FROM A SEVERELY HYDROREFINED NAPHTHETIC OIL HAVING A VISCOSITY FROM 40 TO 200 SUS AT 100*F. AND HAVING AN ULTRAVIOLET ABSORPTIVITY OF LESS THAN 0.04 IN THE 335 MILLIMICRON REGION, SAID PROCESS COMPRISING A. CONVERTING AT LEAST A PORTION OF A MORE SATURATED POLYNUCLEAR HYDROCARBON PRESENT IN SAID HYDROREFINED OIL TO A POLYNUCLEAR HYDROCARBON HAVING AT LEAST FOUR CONENSED AROMATIC RINGS AND WHICH CONTRIBUTES TO SAID ABSORPTIVITY AT 335 MILLIMICRONS, SAID CONVERSION BEING EFFECTED UNTIL SAID ABSORPTIVITY AT 335 MILLICRONS IS IN THE RANGE OF 0.04 TO 2.5 AND
Claim 2
Dependent Claim
100 words
PROCESS FOR PREPARING A HYDROCARBON OIL, USEFUL AS A TRANSFORMER OIL, FROM A SEVERELY HYDROREFINED NAPHTHETIC OIL HAVING A VISCOSITY FROM 40 TO 200 SUS AT 100*F. AND HAVING AN ULTRAVIOLET ABSORPTIVITY OF LESS THAN 0.04 IN THE 335 MILLIMICRON REGION, SAID PROCESS COMPRISING A. CONVERTING AT LEAST A PORTION OF A MORE SATURATED POLYNUCLEAR HYDROCARBON PRESENT IN SAID HYDROREFINED OIL TO A POLYNUCLEAR HYDROCARBON HAVING AT LEAST FOUR CONENSED AROMATIC RINGS AND WHICH CONTRIBUTES TO SAID ABSORPTIVITY AT 335 MILLIMICRONS, SAID CONVERSION BEING EFFECTED UNTIL SAID ABSORPTIVITY AT 335 MILLICRONS IS IN THE RANGE OF 0.04 TO 2.5 AND
Claim 3
Dependent Claim
12 words
Process according to claim 1 wherein said conversion involves a catalytic aromatization.
Claim 4
Dependent Claim
72 words
Process according to claim 2 wherein said catalytic aromatization is effeCted at a temperature above 675*F. but below the temperature where substantial hydrocracking will occur, at a hydrogen partial pressure in the range of 800 to 1600 p.s.i., at a total pressure below 2000 p.s.i.g., and at a liquid hourly space velocity of the fresh feed in the range of 0.1 to 1.0 in the presence of a catalyst having dehydrogenation activity.
Claim 5
Dependent Claim
28 words
Process according to claim 3 wherein said catalyst comprises at least one sulfide of at least one metal selected from the group consisting of cobalt, nickel and molybdenum.
Claim 6
Dependent Claim
206 words
Process according to claim 1 wherein said hydrocarbon oil product of claim 1 has a sludge-free Doble life of at least 100 hours with a total acid number less than 0.1, said oil having a viscosity at 100*F. in the range of 50 to 65 SUS, an ultraviolet absorptivity at 335 millimicrons in the range of 0.06 to 2.0, a sulfur content in the range of 25 to 800 p.p.m., and containing less than 25 p.p.m. of nitrogen, the chemical composition of the hydrocarbons in said oil being such that the ratio of the ultraviolet absorptivity at 335 millimicrons to the absorptivity at 330 millimicrons is no less than 1.0, and wherein said conversion comprises a catalytic aromatization which is effected at a temperature above 675*F. but below the temperature where substantial hydrocracking will occur, at a hydrogen partial pressure in the range of 800 to 1600 p.s.i., at a total pressure below 2000 p.s.i.g., and at a liquid hourly space velocity of the fresh feed in the range of 0.1 to 1.0 in the presence of a catalyst having dehydrogenation activity, and wherein said catalyst comprises at least one sulfide of at least one metal selected from the group consisting of cobalt, nickel and molybdenum.
Claim 7
Dependent Claim
43 words
A process according to claim 5 wherein said hydrocarbon oil has a sludge-free Doble life of at least 200 hours at a total acid number less than 0.01 and wherein said absorptivity at 335 millimicrons is in the range of 0.3 to 1.0.
Claim 8
Dependent Claim
112 words
Process for preparing a hydrocarbon oil, useful as a transformer oil, from a severely hydrorefined naphthenic oil having a viscosity from 40 to 200 SUS at 100*F. and having an ultraviolet absorptivity of less than 0.04 in the 335 millimicron region, said process comprising determining the ultraviolet absorptivity of said hydrorefined oil in the 335 millimicron region and increasing the content in said hydrorefined oil of polynuclear hydrocarbons having at least four condensed aromatic rings until said absorptivity at 335 millimicrons is from 0.04 to 2.5 and contacting the resulting oil with sufficient amount of an adsorbent to produce a transformer oil having a sludge-free Doble life of at least 64 hours.
Claim 9
Dependent Claim
112 words
Process for preparing a hydrocarbon oil, useful as a transformer oil, from a severely hydrorefined naphthenic oil having a viscosity from 40 to 200 SUS at 100*F. and having an ultraviolet absorptivity of less than 0.04 in the 335 millimicron region, said process comprising determining the ultraviolet absorptivity of said hydrorefined oil in the 335 millimicron region and increasing the content in said hydrorefined oil of polynuclear hydrocarbons having at least four condensed aromatic rings until said absorptivity at 335 millimicrons is from 0.04 to 2.5 and contacting the resulting oil with sufficient amount of an adsorbent to produce a transformer oil having a sludge-free Doble life of at least 64 hours.
Claim 10
Dependent Claim
55 words
Process according to claim 7 wherein said content of polynuclear hydrocarbons having at least four condensed aromatic rings is increased by converting at least a portion of a more saturated polynuclear present in the oil to a polynuclear hydrocarbon which contributes to the absorptivity at 335 millimicrons and has at least four condensed aromatic rings.
Claim 11
Dependent Claim
12 words
Process according to claim 8 wherein said conversion involves a catalytic aromatization.
Claim 12
Dependent Claim
72 words
Process according to claim 9 wherein said catalytic aromatization is effected at a temperature above 675*F. but below the temperature where substantial hydrocracking will occur, at a hydrogen partial pressure in the range of 800 to 1600 p.s.i., at a total pressure below 2000 p.s.i.g., and at a liquid hourly space velocity of the fresh feed in the range of 0.1 to 1.0 in the presence of a catalyst having dehydrogenation activity.
Claim 13
Dependent Claim
28 words
Process according to claim 10 wherein said catalyst comprises at least one sulfide of at least one metal selected from the groUp consisting of cobalt, nickel and molybdenum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |