US4304572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of solid fuel-water slurries
Assignee: Texaco Inc
•
Filing: 1977-11-25
•
Granted: 1981-12-08
•
Expires: 1997-11-25
Abstract
Abstract The pumpability of solid fuel-water slurries is improved by incorporation therein of small amounts of ammonia and a surface-active agent.
Inventors
- 👤 Harry C. Wiese
- 👤 John C. Ahlborn, deceased
- 👤 executor by Lloyd K. Ahlborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:54
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326; F; F17; F17D; F17D1/00; F17D1/08; F17D1/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A process for improving the pumpability of a high solids content water slurry of a solid fuel selected from the group consisting os sub-bituminous coal and lignite which comprises forming a water slurry of said solid fuel containing at least 50% solids by weight, said slurry also containing NH 4 OH in an amount between 0.1 and 5.0 weight percent and also containing an anionic surface-active agent comprising a salt of an organic sulfonic acid in an amount between 0.01 and 3.0 weight percent, said amounts being based on the final weight of the slurry.
Claim 2
Dependent Claim
95 words
A process for improving the pumpability of a high solids content water slurry of a solid fuel selected from the group consisting os sub-bituminous coal and lignite which comprises forming a water slurry of said solid fuel containing at least 50% solids by weight, said slurry also containing NH 4 OH in an amount between 0.1 and 5.0 weight percent and also containing an anionic surface-active agent comprising a salt of an organic sulfonic acid in an amount between 0.01 and 3.0 weight percent, said amounts being based on the final weight of the slurry.
Claim 3
Dependent Claim
12 words
The process of claim 1 in which the solid fuel is lignite.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which the solid fuel is sub-bituminous coal.
Claim 5
Dependent Claim
22 words
The process of claim 1 in which at least 50 wt. % of the solid fuel passes through a 200 mesh sieve.
Claim 6
Dependent Claim
22 words
The process of claim 1 in which at least 80 wt. % of the solid fuel passes through a 200 mesh sieve.
Claim 7
Dependent Claim
15 words
The process of claim 1 in which the organic sulfonic agent is 2,6-dihydroxynaphthalene sulfonic acid.
Claim 8
Dependent Claim
14 words
The process of claim 1 in which the organic acid is lignin sulfonic acid.
Claim 9
Dependent Claim
18 words
The process of claim 1 in which the salt of the organic sulfonic acid is a calcium salt.
Claim 10
Dependent Claim
16 words
The process of claim 1 in which the salt of the organic sulfonic acid is sodium.
Claim 11
Dependent Claim
16 words
The process of claim 1 in which the salt of the organic sulfonic acid is ammonium.
Claim 12
Dependent Claim
18 words
The process of claim 1 in which the slurry contains between about 40 and 50 wt. % water.
Claim 13
Dependent Claim
18 words
The process of claim 11 in which the slurry contains between about 40 and 45 wt. % water.
References Cited (Backward Citations)
US2346151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |