Patent US4375358A successfully refreshed from Google Patents.
US4375358A
Expired / Lapsed
US
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Fuel slurries of solid carbonaceous material in water
Assignee: ConocoPhillips Co
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Filing: 1980-09-02
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Granted: 1983-03-01
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Expires: 2000-09-02
Abstract
Abstract Stable, pumpable slurry compositions of finely divided solid carbonaceous material in water are described. The composition includes a gelling agent to provide a supporting gel having a yield stress and a viscosity builder to reduce the bleeding of the supporting gel.
Inventors
- 👤 Charles J. Swartz
- 👤 William P. Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:05
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326; C10L7/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A stable, pumpable slurry composition of finely divided solid carbonaceous material in water wherein said slurry comprises: (a) at least 40 percent by weight of finely divided solid carbonaceous material; (b) water in an amount sufficient to provide a pumpable slurry; (c) a sufficient amount of a wetting agent in said water to effect wetting of the surface of said carbonaceous material; (d) water-dispersible Xanthan gum in said water in an amount sufficient to provide a supporting gel having a yield stress sufficient to support said carbonaceous material in said slurry; and (e) a water-soluble viscosity builder selected from the group consisting of sodium carboxymethyl cellulose, hydroxypropylated cornstarch, hydroxyethyl cellulose, hydroxypropyl methyl cellulose and methyl cellulose in said water in an amount sufficient to substantially reduce bleeding of the supporting gel, whereby said slurry is stabilized against sedimentation caused by bleeding of the supporting gel.
Claim 2
Dependent Claim
145 words
A stable, pumpable slurry composition of finely divided solid carbonaceous material in water wherein said slurry comprises: (a) at least 40 percent by weight of finely divided solid carbonaceous material; (b) water in an amount sufficient to provide a pumpable slurry; (c) a sufficient amount of a wetting agent in said water to effect wetting of the surface of said carbonaceous material; (d) water-dispersible Xanthan gum in said water in an amount sufficient to provide a supporting gel having a yield stress sufficient to support said carbonaceous material in said slurry; and (e) a water-soluble viscosity builder selected from the group consisting of sodium carboxymethyl cellulose, hydroxypropylated cornstarch, hydroxyethyl cellulose, hydroxypropyl methyl cellulose and methyl cellulose in said water in an amount sufficient to substantially reduce bleeding of the supporting gel, whereby said slurry is stabilized against sedimentation caused by bleeding of the supporting gel.
Claim 3
Dependent Claim
34 words
The composition of claim 1 wherein said carbonaceous material is present in an amount of from 60 to 70 percent by weight and at least 90 percent thereof will pass through a 60-mesh sieve.
Claim 4
Dependent Claim
11 words
The composition of claim 2 wherein said carbonaceous material is coal.
Claim 5
Dependent Claim
13 words
The composition of claim 2 wherein said carbonaceous material is a petroleum coke.
Claim 6
Dependent Claim
28 words
The composition of claim 2 wherein said Xanthan gum is present in an amount of from 0.1 to 1.0 percent by weight of the water in said slurry.
Claim 7
Dependent Claim
30 words
The composition of claim 5 wherein said viscosity builder is sodium carboxymethyl cellulose in an amount of from 0.1 to 1.0 percent by weight of the water in said slurry.
Claim 8
Dependent Claim
20 words
The composition of claim 6 wherein at least 80 percent of said carbonaceous material will pass through a 100-mesh sieve.
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) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |