Patent US4478709A successfully refreshed from Google Patents.
US4478709A
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Process for stabilizing dewaxed distillate oils
Assignee: Mobil Oil AS
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Filing: 1981-08-28
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Granted: 1984-10-23
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Expires: 2001-08-28
Abstract
Abstract A method for reducing the pour point of a hydrocarbon oil which comprises contacting said oil under dewaxing conditions with a zeolite dewaxing catalyst thereby forming a dewaxed oil that contains olefins, and contacting said dewaxed oil and said contained olefins with a solid acidic catalyst under conditions effective to increase the stability of said oil.
Inventors
- 👤 Tsoung-Yuan Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:12
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
116 words
A method for producing a stabilized hydrocarbon distillate oil which method comprises contacting an unstable distillate oil and a stabilizing amount of an olefinic naphtha in the gasoline boiling range which contains olefin having at least 4 carbon atoms, with an acidic porous solid stabilization catalyst at a temperature of about 300° to 500° F., a pressure of about 50 to 500 psig, and a liquid hourly space velocity of about 0.25 to 5.0 LHSV, provided that wherein said olefinic naphtha is obtained by catalytically dewaxing a wax-containing distillate oil by contacting said oil with a zeolite dewaxing catalyst, said zeolite dewaxing catalyst has a silica to alumina mole ratio ranging from about 12 to 200.
Claim 2
Independent Claim
116 words
A method for producing a stabilized hydrocarbon distillate oil which method comprises contacting an unstable distillate oil and a stabilizing amount of an olefinic naphtha in the gasoline boiling range which contains olefin having at least 4 carbon atoms, with an acidic porous solid stabilization catalyst at a temperature of about 300° to 500° F., a pressure of about 50 to 500 psig, and a liquid hourly space velocity of about 0.25 to 5.0 LHSV, provided that wherein said olefinic naphtha is obtained by catalytically dewaxing a wax-containing distillate oil by contacting said oil with a zeolite dewaxing catalyst, said zeolite dewaxing catalyst has a silica to alumina mole ratio ranging from about 12 to 200.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein said silica to alumina mole ratio ranges from about 12 to 100.
Claim 4
Dependent Claim
12 words
The method described in claim 1 wherein said stabilization catalyst comprises montmorillonite.
Claim 5
Dependent Claim
19 words
The method described in claim 1 including the step of removing said olefinic naphtha from said stabilized distillate oil.
Claim 6
Dependent Claim
27 words
The method described in claim 1 wherein said olefin is a straight chain olefin and including the step of removing said olefinic naphtha from said stabilized oil.
Claim 7
Dependent Claim
55 words
The method of claim 1 wherein said olefinic naphtha is obtained by catalytically dewaxing a wax-containing distillate oil by contacting said oil with a zeolite dewaxing catalyst under conditions effective to convert at least some of said wax to olefinic naphtha in the gasoline boiling range to produce a dewaxed distillate oil containing olefinic naphtha.
Claim 8
Dependent Claim
15 words
The method of claim 6 wherein said unstable distillate oil is said dewaxed distillate oil.
Claim 9
Dependent Claim
19 words
The method described in claim 7 wherein said dewaxing is conducted at a temperature of 525° to 800° F.
Claim 10
Dependent Claim
24 words
The method of claim 6 wherein said dewaxed distillate oil containing olefinic naphtha is stabilized by contacting with said acidic porous solid stabilization catalyst.
Claim 11
Dependent Claim
15 words
The method described in claim 9 wherein said zeolite dewaxing catalyst is ZSM-5 or ZSM-11.
Claim 12
Dependent Claim
19 words
The method described in claim 9 wherein said dewaxing is conducted at a temperature of 525° to 800° F.
Claim 13
Dependent Claim
15 words
The method described in claim 6 wherein said zeolite dewaxing catalyst is ZSM-5 or ZSM-11.
Claim 14
Dependent Claim
17 words
The method described in claim 12 wherein said dewaxing is conducted in the presence of hydrogen gas.
Claim 15
Dependent Claim
17 words
The method described in claim 6 wherein said dewaxing is conducted in the presence of hydrogen gas.
Claim 16
Dependent Claim
19 words
The method described in claim 6 wherein said dewaxing is conducted at a temperature of 525° to 800° F.
Claim 17
Dependent Claim
19 words
The method described in claim 6 wherein said dewaxing is conducted at a temperature of 525° to 800° F.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |