Lignin Recovery from Spruce Sawdust: Impact of Catalyst Selection on Delignification Efficiency and Lignin Properties

Yıl 2026, Cilt: 26 Sayı: 1, 95 - 111, 27.03.2026

Kübra Al , Sibel Başakçılardan Kabakcı

https://doi.org/10.17475/kastorman.1916868

https://izlik.org/JA79UF63PF

Öz

Aim of study: Forestry residues and wood processing wastes are promising resources for biorefineries due to their abundance and easy accessibility. However, lignin recovery remains challenging in lignocellulosic biorefineries. This study investigates the delignification of spruce sawdust using ethylene glycol organosolv pretreatment, focusing on how catalyst selection affects cellulosic pulp and lignin properties.
Area of study: Spruce sawdust samples were sourced from a wood processing plant in Bursa.
Material and method: Spruce sawdust was delignified using ethylene glycol with phosphoric acid, acetic acid, or sodium hydroxide catalysts at 130 °C under atmospheric pressure. Characterization was done through elemental analysis, FTIR, TGA, Py-GC/MS, and SEC.
Main results: The ethylene glycol-phosphoric acid (EGPA) system showed the highest delignification (41.55%) and lignin recovery (42.87%). The sodium hydroxide system (EGNa) produced lignin with stronger lignin-specific FTIR bands, indicating higher purity. Py-GC/MS analysis showed esterification in both fractions, with EGPAL producing mainly esters, acids and phenols, and EGNaL producing phenols, esters and aldehydes. SEC indicated EGPAL had a lower molecular weight (Mw=2814 g/mol, Mn=828 g/mol) than EGNaL (Mw=4725 g/mol, Mn=1258 g/mol).
Research highlights: Ethylene glycol-based organosolv pretreatment shows promise for biomass valorization, highlighting catalyst effects on delignification, lignin recovery, and characteristics.

Anahtar Kelimeler

Organosolv Pretreatment , Delignification , Ethylene Glycol Treatment , Lignin Recovery , Catalyst

Destekleyen Kurum

This research was financially supported by Yalova University Scientific Research Unit (Project No:2022/YL/0019).

Ladin Talaşından Lignin Geri Kazanımı: Katalizör Seçiminin Delignifikasyon Verimi ve Lignin Özelliklerine Etkisi

https://izlik.org/JA79UF63PF

Öz

Çalışmanın amacı: Orman artıkları ve odun işleme atıkları, bol bulunmaları ve kolay erişilebilirlikleri nedeniyle biyorafineriler için umut verici kaynaklardır. Ancak, lignin geri kazanımı lignoselülozik biyorafinerilerde önemli bir zorluktur. Bu çalışma, etilen glikol organosolv ön işlemi kullanarak ladin talaşının delignifikasyonunu incelemekte ve katalizör seçiminin selülozik hamur ve lignin özelliklerini nasıl etkilediğini araştırmaktır.
Çalışma alanı: Ladin talaşı örnekleri Bursa’daki bir odun işleme tesisinden temin edilmiştir.
Materyal ve yöntem: Ladin talaşı, fosforik asit, asetik asit veya sodyum hidroksit katalizörleri ile 130 °C’de atmosfer basıncı altında etilen glikol kullanılarak delignifiye edilmiştir. Karakterizasyon için elementel analiz, FTIR, TGA, Py-GC/MS ve SEC analizleri uygulanmıştır.
Temel sonuçlar: Etilen glikol-fosforik asit (EGPA) sistemi en yüksek delignifikasyon (% 41.55) ve lignin geri kazanımını (% 42.87) sağlamıştır. Sodyum hidroksit sistemi (EGNa), FTIR spektrumunda lignin-spesifik grupları daha yoğun göstererek daha saf lignin elde edilmesini sağlamıştır. Py-GC/MS analizleri, her iki fraksiyonda da esterleşmeyi göstermiştir; EGPAL esas olarak esterler, asitler ve fenoller üretirken, EGNaL fenoller, esterler ve aldehitler üretmiştir. SEC sonuçlarına göre EGPAL daha düşük moleküler ağırlığa sahiptir (Mw=2814 g/mol, Mn=828 g/mol) ve EGNaL (Mw=4725 g/mol, Mn=1258 g/mol) ile kıyaslandığında bu farklılık belirgin olmuştur.
Araştırma vurguları: Etilen glikol bazlı organosolv ön işlemi, biyokütlenin değerlenmesinde potansiyel taşımakta olup, katalizör seçiminin delignifikasyon verimliliği, lignin geri kazanımı ve özellikleri üzerindeki önemli etkisini vurgulamaktadır.

Anahtar Kelimeler

Organosolv Ön İşlemi , Delignifikasyon , Etilen Glikol İşlemi , Lignin Geri Kazanımı , Katalizör

Kaynakça

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