Patent US4427531A successfully refreshed from Google Patents.
US4427531A
Expired / Lapsed
US
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Process for deasphaltenating cat cracker bottoms and for production of anisotropic pitch
Assignee: EIDP Inc
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Filing: 1981-08-11
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Granted: 1984-01-24
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Expires: 2001-08-11
Abstract
Abstract A process for removing asphaltenes present in cat cracker bottoms is disclosed. Basically, the process requires removal of at least a portion of the polynuclear aromatic oils present in the cat cracker bottom, for example, by vacuum stripping, whereby the asphaltenes are thereafter capable of being extracted from the so-treated cat cracker bottom. Heat soaking of the asphaltene-free cat cracker bottom results in a pitch particularly suitable for carbon artifact manufacture.
Inventors
- 👤 Ghazi Dickakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:44
CPC Classifications
C; C10; C10C; C10C3/00; C10G; C10G21/00; C10G21/003; C10G53/00; C10G53/02; C10G53/04; C10G55/00; C10G55/02; C10G55/04; D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/155
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A process for preparing a feedstock suitable for carbon fiber manufacture comprising the steps of: (1) vacuum stripping a cat cracker bottom to remove from about 70 weight percent to about 85 weight percent of the polynuclear aromatic oils containing 1, 2 and 3 aromatic rings present in lower boiling fractions of said cat cracker bottom; (2) extracting the residue of step 1 with a paraffinic solvent to remove a portion of the asphaltenes present in the vacuum stripped cat cracker bottom; and (3) heat soaking the deasphaltenated cat cracker residue obtained from step 2 to provide a feedstock suitable for carbon fiber manufacture.
Claim 2
Dependent Claim
104 words
A process for preparing a feedstock suitable for carbon fiber manufacture comprising the steps of: (1) vacuum stripping a cat cracker bottom to remove from about 70 weight percent to about 85 weight percent of the polynuclear aromatic oils containing 1, 2 and 3 aromatic rings present in lower boiling fractions of said cat cracker bottom; (2) extracting the residue of step 1 with a paraffinic solvent to remove a portion of the asphaltenes present in the vacuum stripped cat cracker bottom; and (3) heat soaking the deasphaltenated cat cracker residue obtained from step 2 to provide a feedstock suitable for carbon fiber manufacture.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein from about 70 percent to about 85 percent of the polynuclear aromatic oils are removed.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said paraffinic solvent is heptane.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein said heat soaking is carried out at temperatures in the range of about 400° C. to about 460° C.
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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |