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The colloidal behaviour of kraft lignin

Part II. Coagulation of kraft lignin sots in the presence of simple and complex metal ions

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  • Colloid Science
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Summary

The electrolytic coagulation behaviour of kraft lignin (Indulin AT) sols in the presence of simple (LiCl, NaCl, KCl, CsCl, MgCl2, CaCl2, BaCl2) and complex ions (LaCl3, Al(NO3)3, Al2(SO4)3, Th(NO3)4 has been investigated under various pH conditions (pH 2-pH 9).

The kraft lignin sols were prepared by dialysis and ion exchange procedures previously reported.

The critical coagulation concentration (C.C.C.) was found to increase with increasing pH for all salts investigated.

The critical coagulation concentration was independent of sol concentration 20–500 ppm) for simple ions but dependent on sol concentration for the trivalent counterions and the complex ions.

It was not possible to recharge and restabilize the sols with Al(NO3)3 and Al2(SO4)3, whereas charge reversal and restabilization of the sols was obtained with Th(NO3)4.

The lyophobic behaviour of the kraft lignin sols suggested that the long range van der Waal's forces play an important role in the stability behaviour provided the pH is sufficiently low (pH < 9) so that steric interactions can be neglected.

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Authors and Affiliations

  1. Swedish Forest Products Research Laboratory, Box 5604, S-11486, Stockholm

    T. Lindström

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  1. T. Lindström
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With 7 figures and 2 tables

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Lindström, T. The colloidal behaviour of kraft lignin. Colloid & Polymer Sci 258, 168–173 (1980). https://doi.org/10.1007/BF01498276

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  • DOI: https://doi.org/10.1007/BF01498276

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