Patent US4348288A successfully refreshed from Google Patents.
US4348288A
Expired / Lapsed
US
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Process for desalting fuel oil
Assignee: Hitachi Ltd
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Filing: 1979-09-26
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Granted: 1982-09-07
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Expires: 1999-09-26
Abstract
Abstract Fuel oil containing sodium salt, potassium salt and solid matters is purified by separating the fuel oil into fuel oil and sludges by a centrifugal separating means, thereby removing the sludges from the fuel oil, and mixing the fuel oil freed from the sludges with water, and separating the resulting liquid mixture into fuel oil and water. Removal of the salts and the solid matters from the fuel oil can be attained at the same time very effectively with a reduced frequency of cleaning a filter or by omitting the use of the filter, with or without using an emulsion breaker.
Inventors
- 👤 Shoji Yoshinaga
- 👤 Hirosige Kawano
- 👤 Matsuzo Todo
- 👤 Tosihiko Takahasi
- 👤 Kiyoshi Fujiwara
- 👤 Yukio Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:26
CPC Classifications
C; C10; C10G; C10G53/00; C10G53/02; C10G31/00; C10G31/08; C10G31/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
70 words
A process for desalting fuel oil, which comprises a separation step of separating fuel oil containing sludges into fuel oil and sludges, without the addition of an emulsion breaker, by a centrifugal separating means, thereby removing the sludges from the fuel oil, and a washing by mixing-separation step of mixing the fuel oil freed from the sludges with water and separating the resulting liquid mixture into fuel oil and water.
Claim 2
Dependent Claim
70 words
A process for desalting fuel oil, which comprises a separation step of separating fuel oil containing sludges into fuel oil and sludges, without the addition of an emulsion breaker, by a centrifugal separating means, thereby removing the sludges from the fuel oil, and a washing by mixing-separation step of mixing the fuel oil freed from the sludges with water and separating the resulting liquid mixture into fuel oil and water.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein a centrifugal separating means is used in the washing by mixing-separation step.
Claim 4
Dependent Claim
17 words
A process according to claim 2, wherein a plurality of the washing by mixing-separation step is provided.
Claim 5
Dependent Claim
25 words
A process according to claim 3, wherein an emulsion breaker is added to a final stage of the plurality of the washing by mixing-separation step.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein an oil-water separating element is used in the washing by mixing-separation step.
Claim 7
Dependent Claim
33 words
A process according to claim 5, wherein a temperature of the fuel oil in the washing by mixing-separation step is made higher than a temperature of the fuel oil in the separation step.
Claim 8
Dependent Claim
20 words
A process according to claim 1, 2 or 5, wherein a centrifugal separator is used as the centrifugal separating means.
Claim 9
Dependent Claim
20 words
A process according to claim 1, 2, or 5, wherein a centrifugal extractor is used as the centrifugal separating means.
Claim 10
Dependent Claim
22 words
A process according to claim 1, 2, 3 or 5, wherein an emulsion breaker is added to the washing by mixing-separation step.
Claim 11
Dependent Claim
29 words
A process according to claim 1, 2, 3 or 5, wherein the fuel oil is mixed with water, thereby forming an emulsion, and forming sludges in the fuel oil.
Claim 12
Dependent Claim
62 words
A process according to claim 1, wherein said sludges comprise a group of fine water droplets which are separable from the fuel oil by settling and said fuel oil also containing a salt of potassium and/or sodium and small particles of solid matter, a portion of the salt and of said solid matter being removed with the sludges during the separation step.
Claim 13
Dependent Claim
18 words
A process according to claim 11, wherein said fine water particles have a diameter of less than 10-50μ.
Claim 14
Dependent Claim
21 words
A process according to claim 1, wherein said fuel oil containing sludges comprises raw fuel oil free of an emulsion breaker.
Claim 15
Dependent Claim
54 words
A process according to claim 1, wherein said fuel oil also contains a salt of sodium and/or potassium and small particles of solid matter, said solid matter being removed with the sludges during the separation step by the centrifugal separating means and the salt being removed by washing with water in the mixing-separation step.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |