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Valorization of hydrolysis lignin from a spruce-based biorefinery by applying γ-valerolactone treatment
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-13 , DOI: 10.1016/j.biortech.2022.127466 Forough Momayez 1 , Mattias Hedenström 1 , Stefan Stagge 1 , Leif J Jönsson 1 , Carlos Martín 2
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-13 , DOI: 10.1016/j.biortech.2022.127466 Forough Momayez 1 , Mattias Hedenström 1 , Stefan Stagge 1 , Leif J Jönsson 1 , Carlos Martín 2
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Hydrolysis lignin, i.e., the hydrolysis residue of cellulosic ethanol plants, was extracted with the green solvent γ-valerolactone (GVL). Treatments at 170–210 °C were performed with either non-acidified GVL/water mixtures (NA-GVL) or with mixtures containing sulfuric acid (SA-GVL). SA-GVL treatment at 210 °C resulted in the highest lignin solubilization (64% (w/w) of initial content), and 76% of the solubilized mass was regenerated by water-induced precipitation. Regenerated lignins were characterized through compositional analysis with sulfuric acid, as well as using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS), high-performance size-exclusion chromatography (HPSEC), solid-state cross-polarization/magic angle spinning C nuclear magnetic resonance (CP/MAS C NMR) spectroscopy, H–C heteronuclear single-quantum coherence NMR (HSQC NMR), and Fourier-transform infrared (FTIR) spectroscopy. The characterization revealed that the main difference between regenerated lignins was their molecular weight. Molecular weight averages increased with treatment temperature, and they were higher and had broader distribution for SA-GVL lignins than for NA-GVL lignins.
中文翻译：
应用 γ-戊内酯处理对来自云杉生物精炼厂的水解木质素进行增值
水解木质素，即纤维素乙醇植物的水解残渣，采用绿色溶剂γ-戊内酯(GVL)提取。使用非酸化 GVL/水混合物 (NA-GVL) 或含有硫酸的混合物 (SA-GVL) 在 170–210 °C 下进行处理。 210 °C 下的 SA-GVL 处理产生最高的木质素溶解度（初始含量的 64% (w/w)），并且 76% 的溶解质量通过水诱导沉淀而再生。通过硫酸成分分析以及热解气相色谱/质谱 (Py-GC/MS)、高性能尺寸排阻色谱 (HPSEC)、固态交叉极化/魔角对再生木质素进行表征自旋 C 核磁共振 (CP/MAS C NMR) 光谱、H-C 异核单量子相干 NMR (HSQC NMR) 和傅里叶变换红外 (FTIR) 光谱。表征表明，再生木质素之间的主要区别在于它们的分子量。平均分子量随处理温度的增加而增加，SA-GVL 木质素的平均分子量比 NA-GVL 木质素的平均分子量更高且分布更广。
更新日期：2022-06-13
中文翻译：
应用 γ-戊内酯处理对来自云杉生物精炼厂的水解木质素进行增值
水解木质素，即纤维素乙醇植物的水解残渣，采用绿色溶剂γ-戊内酯(GVL)提取。使用非酸化 GVL/水混合物 (NA-GVL) 或含有硫酸的混合物 (SA-GVL) 在 170–210 °C 下进行处理。 210 °C 下的 SA-GVL 处理产生最高的木质素溶解度（初始含量的 64% (w/w)），并且 76% 的溶解质量通过水诱导沉淀而再生。通过硫酸成分分析以及热解气相色谱/质谱 (Py-GC/MS)、高性能尺寸排阻色谱 (HPSEC)、固态交叉极化/魔角对再生木质素进行表征自旋 C 核磁共振 (CP/MAS C NMR) 光谱、H-C 异核单量子相干 NMR (HSQC NMR) 和傅里叶变换红外 (FTIR) 光谱。表征表明，再生木质素之间的主要区别在于它们的分子量。平均分子量随处理温度的增加而增加，SA-GVL 木质素的平均分子量比 NA-GVL 木质素的平均分子量更高且分布更广。
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