US4242098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transport of aqueous coal slurries
Assignee: Union Carbide Corp
•
Filing: 1978-07-03
•
Granted: 1980-12-30
•
Expires: 1998-07-03
Abstract
Abstract Compositions containing small amounts of named water soluble polymers in an aqueous coal slurry permit the extrusion, pumping and transport of higher solids content aqueous coal slurries.
Inventors
- 👤 David B. Braun
- 👤 Stephen Drap
- 👤 Henry E. Fritz
- 👤 Arthur K. Ingberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:47
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; B; B65; B65G; B65G53/00; B65G53/30; C; C09; C09K; C09K3/00; C10; C10L; C10L1/00; C10L1/32; C10L1/326; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
56 words
In an aqueous coal slurry composition comprising water and coal, the improvement of having present therein up to about 10 weight percent based on the total weight of the composition of a water-soluble polymer from the group consisting of hydroxyethyl cellulose, the quaternary nitrogen-substituted cellulose ethers, xanthan gum, hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum.
Claim 2
Dependent Claim
56 words
In an aqueous coal slurry composition comprising water and coal, the improvement of having present therein up to about 10 weight percent based on the total weight of the composition of a water-soluble polymer from the group consisting of hydroxyethyl cellulose, the quaternary nitrogen-substituted cellulose ethers, xanthan gum, hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum.
Claim 3
Dependent Claim
35 words
A composition as claimed in claim 1 wherein the said water-soluble polymer is hydroxyethyl cellulose having an intrinsic viscosity in 3 percent aqueous sodium chloride solution at 25° C. of from 1 to 10 dl/gm.
Claim 4
Dependent Claim
35 words
A composition as claimed in claim 1 wherein the said water-soluble polymer is xanthan gum having an intrinsic viscosity in 3 percent aqueous sodium chloride solution at 25° C. of from 10 to 15 dl/gm.
Claim 5
Dependent Claim
36 words
A composition as claimed in claim 1 wherein the said water-soluble polymer is hydroxypropyl guar gum having an intrinsic viscosity in 3 percent aqueous sodium chloride solution at 25° C. of from 10 to 15 dl/gm.
Claim 6
Dependent Claim
37 words
A composition as claimed in claim 1 wherein the said water-soluble polymer is carboxymethyl hydroxypropyl guar gum having an intrinsic viscosity in 3 percent aqueous sodium chloride solution at 25° C. of from 10 to 15 dl/gm.
Claim 7
Dependent Claim
26 words
A composition as claimed in claim 1 wherein the said water-soluble polymer is a quaternary nitrogen-substituted cellulose ether having a molecular weight from 100,000 to 3,000,000.
Claim 8
Dependent Claim
63 words
In a method for transporting or pumping an aqueous coal slurry, the improvement of having present in the aqueous coal slurry a water-soluble polymer from the group consisting of hydroxyethyl cellulose, the quaternary nitrogen-substituted cellulose ethers, xanthan gum, hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum in a concentration of up to 10 weight percent based on the total weight of the composition.
Claim 9
Dependent Claim
63 words
In a method for transporting or pumping an aqueous coal slurry, the improvement of having present in the aqueous coal slurry a water-soluble polymer from the group consisting of hydroxyethyl cellulose, the quaternary nitrogen-substituted cellulose ethers, xanthan gum, hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum in a concentration of up to 10 weight percent based on the total weight of the composition.
Claim 10
Dependent Claim
41 words
In an aqueous coal slurry composition consisting essentially of water and coal, the improvement of having present therein up to about 10 weight percent based on the total weight of the water and coal composition of a water-soluble poly(ethylene oxide) polymer.
Claim 11
Dependent Claim
41 words
In an aqueous coal slurry composition consisting essentially of water and coal, the improvement of having present therein up to about 10 weight percent based on the total weight of the water and coal composition of a water-soluble poly(ethylene oxide) polymer.
Claim 12
Dependent Claim
55 words
In a method for transporting or pumping an aqueous coal slurry, the improvement of having present in the aqueous coal slurry a water-soluble poly(ethylene oxide) polymer in a concentration of up to 10 weight percent based on the total weight of the composition; said water-soluble polymer reducing the dewatering of the aqueous coal slurry composition.
Claim 13
Dependent Claim
55 words
In a method for transporting or pumping an aqueous coal slurry, the improvement of having present in the aqueous coal slurry a water-soluble poly(ethylene oxide) polymer in a concentration of up to 10 weight percent based on the total weight of the composition; said water-soluble polymer reducing the dewatering of the aqueous coal slurry composition.
Claim 14
Dependent Claim
27 words
The coal slurry composition of claim 8 wherein coal is present in a concentration of over 50 weight percent based on the total weight of the composition.
Claim 15
Dependent Claim
25 words
The method of claim 9 wherein coal is present in a concentration of over 50 weight percent based on the total weight of the composition.
Claim 16
Dependent Claim
23 words
A composition as claimed in claim 8 wherein the concentration of said water-soluble polymer is from 0.05 weight percent to 5.0 weight percent.
Claim 17
Dependent Claim
40 words
A composition as claimed in claim 8 wherein the said water-soluble polymer is poly(ethylene oxide) having an intrinsic viscosity in water at 30° C. of from 1 to 50 dl/gm and an average molecular weight of from 100,000 to 10,000,000.
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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |