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Ion Specific Differences in Salt Induced Precipitation of Kraft Lignin
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0003-3407-7973
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2003 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 18, no 4, p. 400-403Article in journal (Refereed) Published
Abstract [en]

Kraft lignin (KL) precipitation, measured as turbidity, in alkaline solutions (pH = 10.5) at 70 'C in presence of various salts was investigated. Special concern was devoted to study ion specific effects on KL from monovalent cations and anions belonging to the so-called Hofmeister or lyotropic series. Thus, in the study the stability of KL solutions containing different inorganic and organic anions as well as various quaternary ammonium bromides were tested. In the case of inorganic anions, C1 and Br induced a higher degree of KL precipitation compared to NO, and SCN . The effects of the two tested sodium uronates were found to diverge and, on a short time-scale, galacturonate showed a better KL stabilizing capacity than C' . The influence of various tetraalkyl ammonium bromides was compared with the effects of different alkali metal bromides. As the length of the alkyl chain was increased the KL stability was found to be decreasing. However, at equal concentrations, (CH,),NBr was found to induce a lower degree of KL precipita- tion than NaBr. From the outcome of the investigation it can be seen that the effects of different cations on KL precipitation follows the mutual order stated by the classical Hofmeister series, whereas the anionic effect has a reversed correspondence.

Place, publisher, year, edition, pages
2003. Vol. 18, no 4, p. 400-403
Keywords [en]
kraft lignin, precipitation, salt, ion, counterion
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-1848DOI: 10.3183/NPPRJ-2003-18-04-p400-403ISI: 000188873000007Local ID: 627OAI: oai:DiVA.org:miun-1848DiVA, id: diva2:26880
Available from: 2008-09-30 Created: 2009-07-09 Last updated: 2017-12-13Bibliographically approved

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Norgren, MagnusEdlund, Håkan

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