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Optimization of Two-Step Alkali Process of Lignin Removal from Basswood

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  • Wachter Igor

    (Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Integrated Safety, Ulica Jána Bottu 2781/25, 917 24Trnava, Slovak Republic)

  • Štefko Tomáš

    (Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Integrated Safety, Ulica Jána Bottu 2781/25, 917 24Trnava, Slovak Republic)

  • Rolinec Marek

    (Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Integrated Safety, Ulica Jána Bottu 2781/25, 917 24Trnava, Slovak Republic)

Abstract

The aim of the research described in this article was to optimize the basic sulphur process of lignin removal from the raw radially cut basswood (Tilia Cordata) pieces of various thicknesses. Lignin removal took place chemically in several consecutive steps in which the influence of individual parameters was investigated (solutions of NaOH + Na2SO3, KOH + Na2SO3, its concentrations, time of leaching, efficacy of whitening agents, effect of sample washing between individual baths, etc.). Through experiments, it was found that the change of fresh NaOH + Na2SO3 solution during the experiment had no significant effect. In contrast, skipping the washing of the samples with boiling distilled water after the hydroxide bath had a significant effect on the rate and efficiency of lignin removal with H2O2 in the following step. When comparing the lignin removal efficiency of NaOH + Na2SO3 and KOH + Na2SO3, the delignification process was clearly demonstrated to be more effective using the KOH + Na2SO3 solution. Application of the above-mentioned procedures has helped to streamline the lignin removal process from solid basswood.

Suggested Citation

  • Wachter Igor & Štefko Tomáš & Rolinec Marek, 2019. "Optimization of Two-Step Alkali Process of Lignin Removal from Basswood," Research Papers Faculty of Materials Science and Technology Slovak University of Technology, Sciendo, vol. 27(44), pages 153-161, June.
    • Handle: RePEc:vrs:repfms:v:27:y:2019:i:44:p:153-161:n:16
    DOI: 10.2478/rput-2019-0016
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