Department of Chemical & Biological Engineering, Montana State University, Bozeman, Montana 59717, USA.
Department of Chemical & Biological Engineering, Montana State University, Bozeman, Montana 59717, USA; Division of Sustainable Process Engineering, Luleå University of Technology, Luleå, Sweden.
Bioresour Technol. 2024 May;399:130610. doi: 10.1016/j.biortech.2024.130610. Epub 2024 Mar 18.
Lignin utilization in value-added co-products is an important component of enabling cellulosic biorefinery economics. However, aqueous dilute acid pretreatments yield lignins with limited applications due to significant modification during pretreatment, low solubility in many solvents, and high content of impurities (ash, insoluble polysaccharides). This work addresses these challenges and investigates the extraction and recovery of lignins from lignin-rich insoluble residue following dilute acid pretreatment and enzymatic hydrolysis of corn stover using three extraction approaches: ethanol organosolv, NaOH, and an ionic liquid. The recovered lignins exhibited recovery yields ranging from 30% for the ionic liquid, 44% for the most severe acid ethanol organosolv condition tested, and up to 86% for the most severe NaOH extraction condition. Finally, the fractional solubilities of different recovered lignins were assessed in a range of solvents and these solubilities were used to estimate distributions of Hildebrand and Hansen solubility parameters using a novel approach.
木质素在增值副产物中的利用是实现纤维素生物炼制经济性的一个重要组成部分。然而，由于在预处理过程中发生了显著的变化、在许多溶剂中的溶解度低以及杂质（灰分、不溶性多糖）含量高，水相稀酸预处理会产生应用范围有限的木质素。这项工作解决了这些挑战，并研究了使用三种提取方法（乙醇有机溶剂法、NaOH 法和离子液体法）从玉米秸秆经稀酸预处理和酶水解后的富含木质素的不溶性残渣中提取和回收木质素：乙醇有机溶剂法、NaOH 法和离子液体法。回收的木质素的回收率范围为离子液体 30%，测试的最苛刻的酸乙醇有机溶剂条件 44%，最苛刻的 NaOH 提取条件高达 86%。最后，在一系列溶剂中评估了不同回收木质素的分级溶解度，并使用一种新方法利用这些溶解度来估计 Hildebrand 和 Hansen 溶解度参数的分布。
