US3904507A
Expired / Lapsed
US
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Process comprising solvent extraction of a blended oil
Assignee: Sunoco Inc R&M
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Filing: 1974-01-31
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Granted: 1975-09-09
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Expires: 1994-01-31
Abstract
Abstract A petroleum oil of improved stability (e.g., as an electrical insulation medium), can be prepared by a process comprising blending 25-98 parts (preferably 50-95) of a severely hydrorefined oil (preferably, a hydrorefined naphthenic or mildly aromatic oil having a VGC from 0.820-0.940 a viscosity from 30 to 200 SUS at 100*F. and an ultraviolet absorptivity (UVA) of less than 0.04 in the 335 millimicron region (i.e., 335 UVA)) with from 75-2 parts (preferably 50-51) by weight of unhydrogenated naphthenic distillate (which preferably is free of naphthenic acids, and more preferred, has a pour point less than 0*F.), and then extracting the blend with an aromatic selective solvent (e.g., furfural, phenol) to obtain a raffinate oil product. The raffinate can be finished, as by adsorbent contact with attapulgite, acid activated clay or mixtures of such adsorbents. From 0.1-30 weight percent of a cycle oil can be added to the blend before extraction or to the raffinate oil product. Preferably, the blended oil and the raffinate product contain less than 25 ppm of total nitrogen and less than 5 ppm (typically, less than 1 ppm) of a basic nitrogen. The raffinate oils can be useful as electrical oils, textile oils, rubber process oils, refrigerator oils, and mist lubricants. The extract fraction can be used as a rubber process oil.
Inventors
- 👤 Ivor W Mills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:39
CPC Classifications
C; C10; C10G; C10G67/00; C10G69/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
94 words
PROCESS FOR PREPARING A PETROLEUM OIL OF IMPROVED STABLIITY FROM A HYDROGENATED PETROLEUM OIL-HAVING A VISCOSTYGRAVITY CONSTANT IN THE RAGE OF 0.78-0.94 AND AN ULTRAVIOLET ABSORPTIVITY IN THE 335 MILLIMICRON REGION LESS THAN 0.04, SAID PROCESS COMPRISING BLENDING FROM 25-98 PARTS BY WEIGHT OF SAID HYDROGENATED PETROLEUM OIL WITH FORM 75-2 PARTS OF AN UNHYDROGENATED, UNHYDROREFINED PETROLEUM OIL HAVING A VISCOSITY GRAVITY CONSTANT IN THE RANGE OF 0.78-0.99 AND FROM 0.1-30 WEIGHT PERCENT OF A CATALYTICALLY CRACKED CYCLE OIL AND THEN EXTRACTING SAID BLEND WITH AN AROMATIC SELECTIVE SOLVENT TO OBTAN A RAFFINATE PRODUCT.
Claim 2
Dependent Claim
94 words
PROCESS FOR PREPARING A PETROLEUM OIL OF IMPROVED STABLIITY FROM A HYDROGENATED PETROLEUM OIL-HAVING A VISCOSTYGRAVITY CONSTANT IN THE RAGE OF 0.78-0.94 AND AN ULTRAVIOLET ABSORPTIVITY IN THE 335 MILLIMICRON REGION LESS THAN 0.04, SAID PROCESS COMPRISING BLENDING FROM 25-98 PARTS BY WEIGHT OF SAID HYDROGENATED PETROLEUM OIL WITH FORM 75-2 PARTS OF AN UNHYDROGENATED, UNHYDROREFINED PETROLEUM OIL HAVING A VISCOSITY GRAVITY CONSTANT IN THE RANGE OF 0.78-0.99 AND FROM 0.1-30 WEIGHT PERCENT OF A CATALYTICALLY CRACKED CYCLE OIL AND THEN EXTRACTING SAID BLEND WITH AN AROMATIC SELECTIVE SOLVENT TO OBTAN A RAFFINATE PRODUCT.
Claim 3
Dependent Claim
32 words
Process of claim 1 wherein said hydrogenated petroleum oil has a viscosity-gravity constant (VGC) in the range of 0.78-0.899 and an ultraviolet absorptivity of less than 0.1 in the 330 millimicron region.
Claim 4
Dependent Claim
48 words
Process of claim 2 wherein said unhydrogenated oil is selected from a. raffinate from solvent extraction of a naphthenic distillate; b. naphthenic distillate; c. naphthenic acid-free naphthenic distillate; d. and dewaxed paraffinic distillate; and e. mixtures of two or more members from (a), (b), (c) and (d) above.
Claim 5
Dependent Claim
39 words
Process of claim 1 wherein said hydrogenated oil is selected from a. hydrorefined paraffinic petroleum oil; b. hydrorefined naphthenic petroleum oil; c. hydrocracked petroleum oils; and d. mixtures of two or more members from (a), (b) and (c) above.
Claim 6
Dependent Claim
130 words
Process for preparing a hydrocarbon oil from a hydrogenated naphthenic distillate having an ultraviolet absorptivity of less than 0.1 in the 330 millimicron region, said process comprising blending from 40-95 parts of said hydrogenated naphthenic distillate with from 5-60 parts of unhydrorefined, unhydrogenated naphthenic distillate and from 0.1-30 weight percent of a catalytically cracked cycle oil, extracting the resulting blend with an aromatic selective solvent and recovering a raffinate product and wherein said hydrogenated naphthenic distillate has been severely catalytically hydrorefined at a temperature in the range of 500*-750*F., from 800-3000 psi of hydrogen at a liquid hourly space velocity of from 0.1-8.0, such that said hydrogenated oil has a 260 mM absorptivity which is in the range of 40-90% less than did said naphthenic distillate prior to said hydrorefining.
Claim 7
Dependent Claim
130 words
Process for preparing a hydrocarbon oil from a hydrogenated naphthenic distillate having an ultraviolet absorptivity of less than 0.1 in the 330 millimicron region, said process comprising blending from 40-95 parts of said hydrogenated naphthenic distillate with from 5-60 parts of unhydrorefined, unhydrogenated naphthenic distillate and from 0.1-30 weight percent of a catalytically cracked cycle oil, extracting the resulting blend with an aromatic selective solvent and recovering a raffinate product and wherein said hydrogenated naphthenic distillate has been severely catalytically hydrorefined at a temperature in the range of 500*-750*F., from 800-3000 psi of hydrogen at a liquid hourly space velocity of from 0.1-8.0, such that said hydrogenated oil has a 260 mM absorptivity which is in the range of 40-90% less than did said naphthenic distillate prior to said hydrorefining.
Claim 8
Dependent Claim
15 words
Process according to claim 5 wherein said naphthenic distillate is substantially free of naphthenic acids.
Claim 9
Dependent Claim
22 words
Process according to claim 6 wherein the ultraviolet absorptivity of said hydrogenated distillate in the 335 millimicron region is less than 0.04.
Claim 10
Dependent Claim
22 words
Process according to claim 6 wherein said unhydrorefined naphthenic distillate has an ultraviolet absorptivity at 260 millimicrons in the range of 1.0-6.0.
Claim 11
Dependent Claim
22 words
Process according to claim 8 wherein said unhydrorefined naphthenic distillate has an ultraviolet absorptivity at 330 millimicrons in the range of 0.05-2.0.
Claim 12
Dependent Claim
36 words
The process of claim 1 wherein the resulting oil raffinate product is contacted with an adsorbent and the product of the process is a transformer oil having a sludge-free Doble life of at least 64 hours.
Claim 13
Dependent Claim
12 words
Process of claim 1 wherein said adsorbent comprises an acid-activated adsorbent clay.
Claim 14
Dependent Claim
8 words
The product of the process of claim 1.
Claim 15
Dependent Claim
8 words
The product of the process of claim 10.
Claim 16
Dependent Claim
22 words
The process of claim 1 wherein said extraction produces a yield of said raffinate product in the range of 70-95 volume percent.
Claim 17
Dependent Claim
16 words
The process of claim 1 wherein said raffinate has a greater impulse dielectric than said blend.
Claim 18
Dependent Claim
16 words
The process of claim 1 wherein said raffinate has a better inhibitor response than said blend.
Claim 19
Dependent Claim
14 words
The process of claim 1 wherein said raffinate has a better sludge-free Doble life.
Claim 20
Dependent Claim
29 words
The process of claim 1 wherein the product of said process has a viscosity in the range of 30-40 SUS at 100*F. and is useful as a transformer oil.
Claim 21
Dependent Claim
8 words
The product of the process of claim 18.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |