US4434046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preventing phase separation of dewaxed oil
Assignee: Mobil Oil AS
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Filing: 1981-04-30
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Granted: 1984-02-28
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Expires: 2001-04-30
Abstract
Abstract Crude oil, when mildly dewaxed in the absence or presence of added hydrogen, separates into two phases with different pour points. A filtration step, which removes less than 5 percent of the product as solids, prevents this phase separation.
Inventors
- 👤 Costandi A. Audeh
- 👤 David S. Shihabi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:28
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G31/00; C10G31/09; C10G55/00; C10G55/02; C10G55/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
An improved two-step catalytic process for preparing crude oil for transport, the improvement comprising (1) in a first stage contacting at from about 50 to about 500 psig, a LHSV of from about 0.1 to about 2 and a temperature of from about 500° F. to about 800° F., said crude oil with a crystalline aluminosilicate zeolite having a SiO 2 to Al 2 O 3 ratio of at least 12, a constraint index of about 1 to 12, and an alpha value no greater than about one, to substantially dewax said crude oil, the contact being made in the absence or presence of added hydrogen and thereafter cooling said substantially dewaxed crude oil in stages in a temperature of from about 210° F. to about 130° F. and (2) in a second stage filtering said cooled and substantially dewaxed oil thereby separating high melting point hydrocarbons and other organic solids therefrom.
Claim 2
Dependent Claim
152 words
An improved two-step catalytic process for preparing crude oil for transport, the improvement comprising (1) in a first stage contacting at from about 50 to about 500 psig, a LHSV of from about 0.1 to about 2 and a temperature of from about 500° F. to about 800° F., said crude oil with a crystalline aluminosilicate zeolite having a SiO 2 to Al 2 O 3 ratio of at least 12, a constraint index of about 1 to 12, and an alpha value no greater than about one, to substantially dewax said crude oil, the contact being made in the absence or presence of added hydrogen and thereafter cooling said substantially dewaxed crude oil in stages in a temperature of from about 210° F. to about 130° F. and (2) in a second stage filtering said cooled and substantially dewaxed oil thereby separating high melting point hydrocarbons and other organic solids therefrom.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the zeolite is HZSM-5.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the zeolite is alkali metal ZSM-5.
Claim 5
Dependent Claim
46 words
The process of claims 1, 2 or 3 wherein the process of step (1) is carried out at from about 375 to about 450 psig, a LHSV of from about 0.8 to about 1.2 and a temperature of from about 700° F. to about 750° F.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein, prior to step (2) substantially the dewaxed crude is cooled in stages to a final temperature of about 130° F.
Claim 7
Dependent Claim
145 words
An improved two step catalytic process for preparing crude oil for transport, the improvement comprising (1) in a first stage contacting at from about 50 to about 500 psig, a LHSV of from about 0.1 to about 2 and a temperature of from about 500° F. to about 800° F., said crude oil with a crystalline aluminosilicate zeolite having a SiO 2 to AL 2 O 3 ratio of at least 12, a constraint index of about 1 , to 12, to substantially dewax said crude oil, the contact being made in the absence or presence of added hydrogen and thereafter cooling said substantially dewaxed crude oil in stages to a temperature of from about 210° F. to about 130° F. and (2) in a second stage filtering said cooling and substantially dewaxed oil thereby separating high melting point hydrocarbons and other organic solids therefrom.
Claim 8
Dependent Claim
145 words
An improved two step catalytic process for preparing crude oil for transport, the improvement comprising (1) in a first stage contacting at from about 50 to about 500 psig, a LHSV of from about 0.1 to about 2 and a temperature of from about 500° F. to about 800° F., said crude oil with a crystalline aluminosilicate zeolite having a SiO 2 to AL 2 O 3 ratio of at least 12, a constraint index of about 1 , to 12, to substantially dewax said crude oil, the contact being made in the absence or presence of added hydrogen and thereafter cooling said substantially dewaxed crude oil in stages to a temperature of from about 210° F. to about 130° F. and (2) in a second stage filtering said cooling and substantially dewaxed oil thereby separating high melting point hydrocarbons and other organic solids therefrom.
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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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |