US3627673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing low-pour point transformer oils from waxy crudes
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-01-28
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Granted: 1971-12-14
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Expires: 1989-01-28
Abstract
Abstract A high-stability, low-pour point insulating oil is prepared by a process wherein a broad waxy vacuum gas oil fraction is first dewaxed and then fractionated to yield the desired insulating oil fraction. The broad vacuum gas oil fraction may be treated to remove aromatics and polar components. Likewise, the dewaxed oil may be hydrofined before fractionation to improve color, stability and sulfur content. The insulating oil fraction is obtained from the dewaxed oil as a heart cut. The bottoms fraction may be used as a lubricating oil, and the pour point of this fraction can be improved with further fractionation. The high-boiling waxy contaminants picked up during processing are removed as bottoms, thus yielding a product having an improved pour point when compared with an oil prepared by fractionation prior to dewaxing.
Inventors
- 👤 Lorne W Sproule
- 👤 Donald W Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:14
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/22; C; C10; C10M; C10M101/00; C10M101/02; C10M2203/00; C10M2203/06; C10M2203/10; C10M2203/102; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
27 words
The process of claim 1 wherein the vacuum gas oil fraction has a 5LV percent to 95 LV percent boiling range of 579*-715* F. at atmospheric pressure.
Claim 2
Dependent Claim
16 words
dewaxing said extracted vacuum gas oil fraction to a pour point of +20* to -25* F.;
Claim 3
Dependent Claim
45 words
hydrofining said dewaxed, extracted vacuum gas oil fraction with hydrogen and a hydrogenation catalyst, said catalyst comprising hydrogenation components selected from the group consisting of the oxides and sulfides of metals of the sixth and eighth groups of the Periodic Table and mixtures thereof, and
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the vacuum gas oil is dewaxed at a temperature between about +20* to -40* F.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein said hydrofining is conducted at a temperature between about 350* and 650* F. and at a hydrogen pressure between about 300 to 900 p.s.i.g.
Claim 6
Dependent Claim
41 words
distilling said hydrofined dewaxed oil and recovering as a heart cut an insulating oil having a 5 LV percent to 95 LV percent boiling range between 580*-720* F. at atmospheric pressure, thus obtaining further pour point improvement relative to step 2.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the insulating oil has a 5 LV percent to 95 LV percent boiling range between 616*-685* F. at atmospheric pressure.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said heart cut is recovered in more than one fraction.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the extraction solvent is selected from the group consisting of phenol and furfural.
Claim 10
Dependent Claim
105 words
A process for preparing a low-pour point insulating oil which comprises the steps of (1) solvent-extracting a broad waxy paraffinic vacuum gas oil fraction having a 5 LV percent to 95 LV percent boiling range of 550*-750* F. at atmospheric pressure, (2) dewaxing said extracted vacuum gas oil fraction to a pour point between the range of +20* to -25* F., and then (3) distilling the dewaxed fractions and recovering as a heart cut an insulating oil fraction having a 5 LV percent to 95 LV percent boiling range of 580*-720* F. at atmospheric pressure, thus obtaining further pour point improvement relative to step 2.
Claim 11
Dependent Claim
16 words
The process of claim 8 wherein the heart cut is recovered in more than one fraction.
Claim 12
Dependent Claim
51 words
The process of claim 8 wherein the vacuum gas oil fraction has a 5 LV percent to 95 LV percent boiling range of 579*-715* F. at atmospheric pressure, and the insulating oil is obtained with a 5 LV percent to 95 LV percent boiling range of 616*-685* F. at atmospheric pressure.
Claim 13
Dependent Claim
19 words
The process of claim 8 wherein the extraction solvent is selected from the group consisting of phenol and furfural.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |