US4057489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a transformer oil having lower pour point and improved oxidation stability
Assignee: Gulf Research and Development Co
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Filing: 1976-12-29
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Granted: 1977-11-08
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Expires: 1996-12-29
Abstract
Abstract Transformer oils having pour points below -40 DEG F. (-40.00 DEG C.) are produced by the process of reducing the nitrogen concentration of a petroleum hydrocarbon feed stock, contacting the denitrogenated product with a catalyst comprising a Group IV-B metal and a Group VIII noble metal on a decationized crystalline mordenite support under pour point reduction conditions of temperature, pressure and space velocity, and thereafter passing the product of the pour point reduction step to a lubricating oil oxidation stability step.
Inventors
- 👤 Angelo Anthony Montagna
- 👤 Allen Evarts Somers
- 👤 Raynor Tyler Sebulsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/18; B01J29/20; B01J29/22; C; C10; C10G; C10G2400/00; C10G2400/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A process for producing a transformer oil having a lower pour point and improved oxidation stability which comprises contacting a petroleum lubricating oil feed having a nitrogen concentration of less than 30 ppm and having a Saybolt Universal viscosity at 100° F. in the range of 52 to 62 seconds with hydrogen and a pour point reduction catalyst under pour point reduction reaction conditions, said pour point reduction catalyst comprising a Group IV-B metal, a Group VIII noble metal, and a decationized mordenite support, said pour point reduction reaction conditions providing for a lubricating oil product wherein from 8 to 30 weight percent of said oil feed has been converted to products boiling below 450° F., and subjecting said lubricating oil product having a lower pour point to an oxidation stabilization step to provide said transformerail.
Claim 2
Dependent Claim
136 words
A process for producing a transformer oil having a lower pour point and improved oxidation stability which comprises contacting a petroleum lubricating oil feed having a nitrogen concentration of less than 30 ppm and having a Saybolt Universal viscosity at 100° F. in the range of 52 to 62 seconds with hydrogen and a pour point reduction catalyst under pour point reduction reaction conditions, said pour point reduction catalyst comprising a Group IV-B metal, a Group VIII noble metal, and a decationized mordenite support, said pour point reduction reaction conditions providing for a lubricating oil product wherein from 8 to 30 weight percent of said oil feed has been converted to products boiling below 450° F., and subjecting said lubricating oil product having a lower pour point to an oxidation stabilization step to provide said transformerail.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said Group IV-B metal comprises titanium.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein said Group VIII noble metal comprises palladium.
Claim 5
Dependent Claim
64 words
The process of claim 1 wherein said pour point reduction reaction conditions include a temperature in the range of 450° to 700° F., a hydrogen partial pressure in the range of 500 to 2,000 psig, a hydrogen circulation rate in the range of 1,000 to 10,000 standard cubic feet per barrel, and a liquid hourly space velocity in the range of 0.2 to 10.
Claim 6
Dependent Claim
173 words
A process for producing a transformer oil having a lower pour point and improved oxidation stability which comprises contacting a petroleum lubricating oil feed having a nitrogen concentration greater than 30 ppm and having a Saybolt Universal viscosity at 100° F. in the range of 52 to 62 seconds with hydrogen and a denitrogenation catalyst in a denitrogenatin zone under hydrodenitrogenation reaction conditions, recovering a lubricating oil product from said hydrodenitrogenation reaction containing less than 30 ppm nitrogen, contacting said lubricating oil from said hydrodenitrogenation reaction with hydrogen and a pour point reduction catalyst under pour point reduction reaction conditions, said pour point reduction catalyst comprising a Group IV-B metal, a Group VIII noble metal, and a decationized mordenite support, said pour point reduction reaction conditions providing for a lubricating oil product wherein from 8 to 30 weight percent of said oil feed has been converted to products boiling below 450° F., and subjecting said lubricating oil product having a lower pour point to an oxidation stabilization step to provide said transformer oil.
Claim 7
Dependent Claim
173 words
A process for producing a transformer oil having a lower pour point and improved oxidation stability which comprises contacting a petroleum lubricating oil feed having a nitrogen concentration greater than 30 ppm and having a Saybolt Universal viscosity at 100° F. in the range of 52 to 62 seconds with hydrogen and a denitrogenation catalyst in a denitrogenatin zone under hydrodenitrogenation reaction conditions, recovering a lubricating oil product from said hydrodenitrogenation reaction containing less than 30 ppm nitrogen, contacting said lubricating oil from said hydrodenitrogenation reaction with hydrogen and a pour point reduction catalyst under pour point reduction reaction conditions, said pour point reduction catalyst comprising a Group IV-B metal, a Group VIII noble metal, and a decationized mordenite support, said pour point reduction reaction conditions providing for a lubricating oil product wherein from 8 to 30 weight percent of said oil feed has been converted to products boiling below 450° F., and subjecting said lubricating oil product having a lower pour point to an oxidation stabilization step to provide said transformer oil.
Claim 8
Dependent Claim
102 words
The process of claim 5 wherein said denitrogenation catalyst comprises at least one metal, metal oxide or metal sulfide selected from Group VI-B metals and at least one metal, metal oxide or metal sulfide selected from Group VIII metals on a refractory oxide carrier, and wherein said hydrodenitrogenation reaction conditions include a temperature in the range of 500° to 1,000° F., a hydrogen partial pressure in the range of 200 to 4,000 psig, a hydrogen circulation rate between 700 to 15,000 standard cubic feet per barrel of feed, and a liquid hourly weight space velocity in the range of 0.2 to 10.
Claim 9
Dependent Claim
15 words
The process of claim 6 wherein said oxidation stabilization step comprises a clay finishing step.
References Cited (Backward Citations)
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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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |