Colloid and Polymer Science

, Volume 258, Issue 2, pp 168–173 | Cite as

The colloidal behaviour of kraft lignin

Part II. Coagulation of kraft lignin sots in the presence of simple and complex metal ions
  • T. Lindström
Original Contribution Colloid Science
Received:

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.

Keywords

Lignin LiCl CsCl BaCl2 Charge Reversal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Dr. Dietrich Steinkopff Verlag 1980

Authors and Affiliations

  • T. Lindström
    • 1
  1. 1.Swedish Forest Products Research LaboratoryStockholm

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