US4302212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersing agents for an aqueous slurry of coal powder
Assignee: Kao Corp
•
Filing: 1980-07-01
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Granted: 1981-11-24
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Expires: 2000-07-01
Abstract
Abstract Aqueous dispersions of coal powder having good flowability properties are provided by employing, as the dispersing agent, an anionic surface active agent having the formula: [R--O--CH.sub.2 CH.sub.2 O--.sub.m SO.sub.3 ].sub.n M wherein R is an alkyl or alkenyl group having 6 to 22 carbon atoms or an alkyl- or alkenyl-substituted aryl group having 4 to 22 carbon atoms in the substituent thereof, m is an integer of from 2 to 50, n is a number of from 1 to 3 and is the same as the valence of the counter ion M, and M is a cation having a valence of from 1 to 3.
Inventors
- 👤 Masaaki Yamamura
- 👤 Noboru Moriyama
- 👤 Shinichi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:06
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
109 words
An aqueous slurry of coal powder having good flowability properties, which comprises coal powder, water and, as a dispersing agent therefor, an anionic surface active agent having the formula: [R--O--CH.sub.2 CH.sub.2 O--.sub.m SO.sub.3 ].sub.n M wherein R is an alkyl or alkenyl group having 6 to 22 carbon atoms or an alkyl- or alkenyl-substituted aryl group having 4 to 22 carbon atoms in the substituent thereof, m is an integer of from 2 to 50, n is a number of from 1 to 3 and is the same as the valence of the counter ion M, and M is a cation having a valence of from 1 to 3.
Claim 2
Dependent Claim
109 words
An aqueous slurry of coal powder having good flowability properties, which comprises coal powder, water and, as a dispersing agent therefor, an anionic surface active agent having the formula: [R--O--CH.sub.2 CH.sub.2 O--.sub.m SO.sub.3 ].sub.n M wherein R is an alkyl or alkenyl group having 6 to 22 carbon atoms or an alkyl- or alkenyl-substituted aryl group having 4 to 22 carbon atoms in the substituent thereof, m is an integer of from 2 to 50, n is a number of from 1 to 3 and is the same as the valence of the counter ion M, and M is a cation having a valence of from 1 to 3.
Claim 3
Dependent Claim
30 words
An aqueous slurry of coal powder in accordance with claim 1, wherein R is an alkyl-substituted phenyl group in which the alkyl substituent has from 6 to 18 carbon atoms.
Claim 4
Dependent Claim
30 words
An aqueous slurry of coal powder in accordance with claim 1, wherein R is an alkyl-substituted phenyl group in which the alkyl substituent has from 6 to 12 carbon atoms.
Claim 5
Dependent Claim
35 words
An aqueous slurry of coal powder in accordance with claim 1, wherein the amount of anionic surface active agent is about 0.01 to 5.0% by weight based on the total amount of the aqueous slurry.
Claim 6
Dependent Claim
35 words
An aqueous slurry of coal powder in accordance with claim 1, wherein the amount of anionic surface active agent is about 0.05 to 2.0% by weight based on the total amount of the aqueous slurry.
Claim 7
Dependent Claim
32 words
An aqueous slurry of coal powder in accordance with claim 1, wherein the amount of coal is about 30 to 85% by weight based on the total amount of the aqueous slurry.
Claim 8
Dependent Claim
32 words
An aqueous slurry of coal powder in accordance with claim 1, wherein the amount of coal is about 50 to 75% by weight based on the total amount of the aqueous slurry.
Claim 9
Dependent Claim
21 words
An aqueous slurry of coal powder in accordance with claim 1, wherein m is an integer of from 4 to 20.
Claim 10
Dependent Claim
31 words
An aqueous slurry of coal powder in accordance with claim 1, further including up to 50 mole %, based on the anionic surface active agent, of a non-ionic surface active agent.
Claim 11
Dependent Claim
129 words
A process for preparing an aqueous slurry of coal powder having good flowability so as to enhance transportation and handling which comprises incorporating into said slurry an anionic surface active dispersing agent having the formula: [R--O--CH.sub.2 CH.sub.2 O--.sub.m SO.sub.3 ].sub.n M wherein R is an alkyl or alkenyl group having 6 to 22 carbon atoms or an alkyl- or alkenyl-substituted aryl group having 4 to 22 carbon atoms in the substituent thereof, m is an integer of from 2 to 50, n is a number of from 1 to 3 and is the same as the valence of the counter ion M, and M is a cation having valence of from 1 to 3, and mixing said resulting aqueous slurry so as to thoroughly blend said dispersing agent therein.
Claim 12
Dependent Claim
129 words
A process for preparing an aqueous slurry of coal powder having good flowability so as to enhance transportation and handling which comprises incorporating into said slurry an anionic surface active dispersing agent having the formula: [R--O--CH.sub.2 CH.sub.2 O--.sub.m SO.sub.3 ].sub.n M wherein R is an alkyl or alkenyl group having 6 to 22 carbon atoms or an alkyl- or alkenyl-substituted aryl group having 4 to 22 carbon atoms in the substituent thereof, m is an integer of from 2 to 50, n is a number of from 1 to 3 and is the same as the valence of the counter ion M, and M is a cation having valence of from 1 to 3, and mixing said resulting aqueous slurry so as to thoroughly blend said dispersing agent therein.
Claim 13
Dependent Claim
24 words
The process of claim 10 wherein R is an alkyl-substituted phenyl group in which the alkyl substituent has from 6 to 18 carbon atoms.
Claim 14
Dependent Claim
24 words
The process of claim 10 wherein R is an alkyl-substituted phenyl group in which the alkyl substituent has from 6 to 12 carbon atoms.
Claim 15
Dependent Claim
29 words
The process of claim 10 wherein the amount of anionic surface active agent is about 0.1 to 5.0% by weight based on the total amount of the aqueous slurry.
Claim 16
Dependent Claim
29 words
The process of claim 10 wherein the amount of anionic surface active agent is about 0.05 to 2.0% by weight based on the total amount of the aqueous slurry.
Claim 17
Dependent Claim
26 words
The process of claim 10 wherein the amount of coal is about 30 to 85% by weight based on the total amount of the aqueous slurry.
Claim 18
Dependent Claim
26 words
The process of claim 10 wherein the amount of coal is about 50 to 75% by weight based on the total amount of the aqueous slurry.
Claim 19
Dependent Claim
15 words
The process of claim 10 wherein m is an integer of from 4 to 20.
Claim 20
Dependent Claim
25 words
The process of claim 10 further including up to 50 mole %, based on the anionic surface active agent, of a non-ionic surface active agent.
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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |