Dispersing agents for an aqueous slurry of coal powder
AssigneeKao Soap Co., Ltd.
InventorsMasaaki Yamamura, Noboru Moriyama, Shinichi Watanabe
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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.
Claims18
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.
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.
Dependencies are inferred from the claim text.