US4532227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low ash pelleted carbon and process of preparation
Assignee: Texaco Development Corp
•
Filing: 1980-12-22
•
Granted: 1985-07-30
•
Expires: 2000-12-22
Abstract
Abstract Low ash pelleted carbon is prepared by contacting pelleted carbon first with hydrochloric acid followed by leaching with hydrofluoric acid.
Inventors
- 👤 Robert M. Suggitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:00
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/18; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/378
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
54 words
The method of preparing a low ash pelletted carbon which comprises leaching a high ash pelletted carbon in contact with hydrochloric acid thereby forming a reduced ash pelletted carbon; leaching said reduced ash pelletted carbon in contact with hydrofluoric acid thereby forming a low ash pelletted carbon; and recovering said low ash pelletted carbon.
Claim 2
Independent Claim
54 words
The method of preparing a low ash pelletted carbon which comprises leaching a high ash pelletted carbon in contact with hydrochloric acid thereby forming a reduced ash pelletted carbon; leaching said reduced ash pelletted carbon in contact with hydrofluoric acid thereby forming a low ash pelletted carbon; and recovering said low ash pelletted carbon.
Claim 3
Dependent Claim
24 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said high ash pelletted carbon contains 2-20% non-volatile ash.
Claim 4
Dependent Claim
22 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said hydrochloric acid is aqueous hydrochloric acid.
Claim 5
Dependent Claim
26 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said leaching with hydrochloric acid is carried out for 1-144 hours.
Claim 6
Dependent Claim
27 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said leaching with hydrochloric acid is carried out at 100° F.-250° F.
Claim 7
Dependent Claim
27 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said leaching with hydrochloric acid is carried out at 130° F.-140° F.
Claim 8
Dependent Claim
22 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said hydrofluoric acid is aqueous hydrofluoric acid.
Claim 9
Dependent Claim
26 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said leaching with hydrofluoric acid is carried out for 1-144 hours.
Claim 10
Dependent Claim
27 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said leaching with hydrofluoric acid is carried out at 100° F.-250° F.
Claim 11
Dependent Claim
27 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said leaching with hydrofluoric acid is carried out at 130° F.-140° F.
Claim 12
Dependent Claim
27 words
The method of preparing a low ash pelletted carbon as claimed in claim 1 wherein said low ash pelletted carbon contains less than about 0.1% non-volatile ash.
Claim 13
Independent Claim
98 words
The method of preparing a low ash pelletted carbon from a high ash pelletted carbon containing 3%-10% non-volatile ash including silica and non-silicious components selected from the group consisting of sodium, magnesium, calcium, aluminum, iron, and phosphate which comprises leaching said high ash pelletted carbon in contact with aqueous hydrochloric acid at 100° F.-250° F. thereby forming a reduced ash carbon; leaching said reduced ash pelletted carbon in contact with aqueous hydrofluoric acid at 100° F.-250° F. thereby forming a low ash pelletted carbon containing less than 0.1% of non-volatile ash; and recovering said low ash pelletted carbon.
Claim 14
Independent Claim
98 words
The method of preparing a low ash pelletted carbon from a high ash pelletted carbon containing 3%-10% non-volatile ash including silica and non-silicious components selected from the group consisting of sodium, magnesium, calcium, aluminum, iron, and phosphate which comprises leaching said high ash pelletted carbon in contact with aqueous hydrochloric acid at 100° F.-250° F. thereby forming a reduced ash carbon; leaching said reduced ash pelletted carbon in contact with aqueous hydrofluoric acid at 100° F.-250° F. thereby forming a low ash pelletted carbon containing less than 0.1% of non-volatile ash; and recovering said low ash pelletted carbon.
Claim 15
Dependent Claim
34 words
A low ash pelletted carbon characterized by an ash content of less than about 0.1% of non-volatile ash and by a silica content of less than 0.1% prepared by the process of claim 12.
Claim 16
Dependent Claim
67 words
A low ash pelletted carbon characterized by an ash content of less than about 0.1% of non-volatile ash prepared by the method which comprises leaching a high ash pelletted carbon in contact with hydrochloric acid thereby forming a reduced ash pelletted carbon; leaching said reduced ash pelletted carbon in contact with hydrofluoric acid thereby forming a low ash pelletted carbon; and recovering said low ash pelletted carbon.
Claim 17
Dependent Claim
67 words
A low ash pelletted carbon characterized by an ash content of less than about 0.1% of non-volatile ash prepared by the method which comprises leaching a high ash pelletted carbon in contact with hydrochloric acid thereby forming a reduced ash pelletted carbon; leaching said reduced ash pelletted carbon in contact with hydrofluoric acid thereby forming a low ash pelletted carbon; and recovering said low ash pelletted carbon.
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |