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Possible mechanism for anthraquinone species diffusion in alkaline pulpingAuthor(s): X.-S. Chai; J. Samp; Q.X. Hou; S.-H Yoon; J.Y. Zhu
Source: Industrial & engineering chemistry research. Vol. 46, no. 15 (2007): Pages 5245-5249
Publication Series: Miscellaneous Publication
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DescriptionAn analysis of the effectiveness of anthraquinone (AQ) in kraft-AQ pulping in terms of its mechanism of transport has been conducted. Our previous work showed that caustic solutions of wood lignin can decrease the membrane exclusion for anthraquinones, i.e., the presence of wood lignin enhances the ability of AQ to pass through a membrane when a reducing agent is present in the acceptor stream. This work seeks to demonstrate that a similar behavior may occur during pulping. The adsorption behavior of AQ species was analyzed, and it was shown that anthraquinone-2-sulfonic acid (AQ-S), a water soluble derivative of AQ, selectively adsorbed on wood. The adsorption of AQ dispersed in a caustic lignin solution also showed selective adsorption on wood, to an even greater extent than the AQ-S. This adsorption behavior, along with the membrane penetration behavior described in our previous work, leads to a mechanism for the transport of AQ into wood chips during kraft pulping.
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CitationChai, X.-S.; Samp, J.; Hou, Q.X.; Yoon, S.-H; Zhu, J.Y. 2007. Possible mechanism for anthraquinone species diffusion in alkaline pulping. Industrial and Engineering Chemistry Research. 46(15): 5245-5249.
KeywordsMembranes, sulphate pulping process, anthraquinones, lignin, adsorption, pine, pulping, chips, maple, sulfonic acid, pulp and paper processes, AHQ, delignification
- Spectroscopic determination of anthraquinone in kraft pulping liquors using a membrane interface
- Composition of the organic components in polyxometalate (POM) liquors from kraft pulp bleaching
- Studies of lignin transformation in polyoxometalate (POM) bleaching of kraft pulp
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