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Alkaline delignification of tropical hardwoods: a promising approach for materials development.

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Title: Alkaline delignification of tropical hardwoods: a promising approach for materials development.
Authors: Maturana Guevara, Juan Carlos1,2 (AUTHOR), Arroyave Quiceno, Catalina3 (AUTHOR), Hurtado, Alejandro4 (AUTHOR), Echeverría, Félix5 (AUTHOR), Correa, Esteban1 (AUTHOR) escorrea@udemedellin.edu.co
Source: Chemical Engineering Communications. 2025, Vol. 212 Issue 10, p1564-1576. 13p.
Subjects: Sodium hydroxide, Delignification, Compacting, Hardwood forests, Lignin biodegradation, New product development, Mechanical behavior of materials, Sodium sulfites
Abstract: Wood delignification is a promising method, prior to densification, for developing new materials from tropical hardwoods. This study investigated the uniformity and efficiency of partial alkaline delignification of three commercially important tropical hardwoods (Andiroba, Sande, and Choiba) using a mixed aqueous solution of sodium hydroxide and sodium sulfite as a pretreatment for densification. The effects and distribution of the solution under the influence of the anatomical features of each hardwood were analyzed using FT-IR, OM, and SEM. The process resulted in the partial removal of lignin and hemicellulose in varying proportions between the center and ends of the wood. This reduction in lignin and hemicellulose content led to a decrease in modulus of elasticity (MOE), modulus of rupture (MOR), and hardness (about 34% in all three species) of the delignified wood (DW). Additionally, the results suggest that sodium accumulation (about 2% in all three species) in the wood structure may also modify its mechanical properties. The relationship between the chemical treatment and the anatomical characteristics of the wood species was found to influence delignification, which in turn affected the effectiveness of densification and subsequent compression. The findings of this study suggest that alkaline delignification is a promising approach for developing new materials from tropical hardwoods, but further research is needed to optimize the process and minimize the negative impact on mechanical properties. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Communications is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Alkaline delignification of tropical hardwoods: a promising approach for materials development.
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Engineering+Communications%22">Chemical Engineering Communications</searchLink>. 2025, Vol. 212 Issue 10, p1564-1576. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Sodium+hydroxide%22">Sodium hydroxide</searchLink><br /><searchLink fieldCode="DE" term="%22Delignification%22">Delignification</searchLink><br /><searchLink fieldCode="DE" term="%22Compacting%22">Compacting</searchLink><br /><searchLink fieldCode="DE" term="%22Hardwood+forests%22">Hardwood forests</searchLink><br /><searchLink fieldCode="DE" term="%22Lignin+biodegradation%22">Lignin biodegradation</searchLink><br /><searchLink fieldCode="DE" term="%22New+product+development%22">New product development</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Sodium+sulfites%22">Sodium sulfites</searchLink>
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  Data: Wood delignification is a promising method, prior to densification, for developing new materials from tropical hardwoods. This study investigated the uniformity and efficiency of partial alkaline delignification of three commercially important tropical hardwoods (Andiroba, Sande, and Choiba) using a mixed aqueous solution of sodium hydroxide and sodium sulfite as a pretreatment for densification. The effects and distribution of the solution under the influence of the anatomical features of each hardwood were analyzed using FT-IR, OM, and SEM. The process resulted in the partial removal of lignin and hemicellulose in varying proportions between the center and ends of the wood. This reduction in lignin and hemicellulose content led to a decrease in modulus of elasticity (MOE), modulus of rupture (MOR), and hardness (about 34% in all three species) of the delignified wood (DW). Additionally, the results suggest that sodium accumulation (about 2% in all three species) in the wood structure may also modify its mechanical properties. The relationship between the chemical treatment and the anatomical characteristics of the wood species was found to influence delignification, which in turn affected the effectiveness of densification and subsequent compression. The findings of this study suggest that alkaline delignification is a promising approach for developing new materials from tropical hardwoods, but further research is needed to optimize the process and minimize the negative impact on mechanical properties. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Chemical Engineering Communications is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/00986445.2025.2482167
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        Text: English
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      – SubjectFull: Sodium hydroxide
        Type: general
      – SubjectFull: Delignification
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      – SubjectFull: Compacting
        Type: general
      – SubjectFull: Hardwood forests
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      – SubjectFull: Lignin biodegradation
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      – SubjectFull: New product development
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Sodium sulfites
        Type: general
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      – TitleFull: Alkaline delignification of tropical hardwoods: a promising approach for materials development.
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            NameFull: Maturana Guevara, Juan Carlos
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            NameFull: Hurtado, Alejandro
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            NameFull: Echeverría, Félix
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              Text: 2025
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