Co-production of levulinic acid and lignin adsorbent from aspen wood with combination of liquid hot water and green-liquor pretreatments. (15th September 2022)

• Record Type: Journal Article
• Authors: Madadi, Meysam; M.A Bakr, Mahmoud; Song, Guojie; Sun, Chihe; Sun, Fubao; Hao, Zhikui; Zahoor, ; Abomohra, Abdelfatah
• Is Part Of: Journal of cleaner production. Volume 366(2022)
• Publication Date: 2022-09-15
• Subjects: Lignocellulosic biorefinery -- Sequential pretreatment -- Enzymatic hydrolysability -- Biosorbent -- Energy recovery; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.132817
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Efficient lignocellulosic fractionation and conversion into platform chemicals provide a considerable opportunity for the industrial operation of a lignocellulosic biorefinery. However, single-step pretreatments are often insufficient to overcome biomass recalcitrance as the existence of insoluble lignin generally restricts component fractionation and conversion. This study performed a two-step pretreatment, consisting of sequential liquid hot water (LHW) and green-liquor (GL), for bioprocessing of aspen biomass into bioproducts such as glucose, levulinic acid (LA), and lignin adsorbent. The two-step pretreated glucan-rich solid displayed high cellulose accessibility, which is responsible for 94% of the glucose yield. The optimized LHW pretreatment (200 °C, 40 min) solubilized 91% of the hemicellulose, which together with monomeric sugars in the hydrolysate solution was straightly heated at 190 °C for 80 min and yielded 72.49% of LA in the presence of sulfuric acid as a catalyst. Moreover, GL post-treatment (Na2 CO3 +Na2 SO3 ) solution maximized the delignification at 78% from LHW pretreated substrate. The isolated lignin possessed a remarkable ability for Cd 2+ and Pb 2+ uptake with maximized adsorption values of 250 mg/g and 228 mg/g, respectively. Finally, energy analyses showed that moderate lignocellulosic conversion could obtain an energy recovery of 85%, providing a sustainable pathway for biorefinery approaches. Graphical abstract: Image 1 Highlights: Two-step LHW-GL pretreatment advanced as sustainable path for biomass fractionation. Hydrolysate fraction of LHW treatment produced a levulinic acid yield of 72.49%. Isolated lignin via GL treatment presented a high adsorption capacity of trace metals. Pretreated glucan-rich solid substrates achieved a glucose yield of 94%. Energy assessments revealed a potential energy recovery of 85%.