Preparation of Lignin Composite Kraft Pulp Based on Black Liquor Absorption and the Following Acidification

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<p>Kraft pulp is the most expanding pulp in the world, applicable to every kind of wood species. A few drawbacks of kraft pulping are that its yield is low around 50% and the dissolved lignin is used only for energy after concentration of the black liquor. This research aims at overcoming them by development of novel lignin composite kraft pulp. We propose a unique lignin composite process based on black liquor absorption with pulp and the following acidification. Various kinds of lignin are typically dissolved in alkaline solution and are precipitated at neutral or acidic pH. According to this mechanism, lignin could be precipitated in pulp swollen with black liquor.</p><p>Model black liquor was prepared by dissolving commercially available kraft lignin in 2 N NaOH. Bleached softwood kraft pulp was immersed in the black liquor for 5 min and the pulp was acidified with 10% acetic acid. After defibrillation, a hand-made paper was prepared from lignin composite pulp. The paper demonstrated good tensile and tear strength with increased hydrophobicity. It seemed that lignin is less oriented at the surface and included more in the cell wall of the fibers. This kind of fiber is very difficult to be produced by both mechanical and chemical pulping. Our method could contribute to increase the yield of kraft pulp and create novel fibers with various characteristics.</p>

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  • 紙パ技協誌

    紙パ技協誌 71 (5), 556-561, 2017

    紙パルプ技術協会

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