How should I select a suitable surfactant for coal-water slurry which could overcome the sedimentation problem without the increase in slurry viscosity during flow in pipes? What should be the surfactant selection parameters in this case?
In our RF Patent 2243251 for coal-water slurry : administered substance fractions obtained by sulfonation of toluene-xylene-benzene coal tar and then neutralizing the resulting mixture with a base.
Best regards.
Don't forget that size and density affect sedimentation too - if your material is too large (> 5 um or so, nothing but a viscosity increase will prevent the sedimentation). Stability is governed by zeta potential too - you'd need an ionic surfactant in the optimum concentration to stabilize. Alternatively a steric stabilizer such as a low molecular weight polymer. See:
Nov 11th, 2008. Dispersion and nanotechnology http://tinyurl.com/hpywsge
To add to my earlier answer, note that a surfactant is normally used as a wetting agent in the formation of a stable dispersion from a powder (wetting-separation-stabilization). An ionic surfactant can stabilize appropriate systems but view the webinar in my first answer.
Try to ensure the required ionic nature of the surfactants & surfactant percentage for the system.
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