Article
Engineering, Chemical
Weisheng Yang, Xiu Wang, Shuzhen Ni, Xinliang Liu, Rui Liu, Chaoquan Hu, Hongqi Dai
Summary: Separating aromatic monomers from lignin oil using a binary solvent mixture of petroleum ether and dichloromethane was studied, with the extraction efficiency affected by solvent polarity and temperature. By adjusting the PE:DCM ratio and conducting sequential extractions, a high recovery rate of aromatic monomers was achieved. Lowering the extraction temperature also increased the separation efficiency of aromatic monomers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Amir Jalalinejad, Jaber Yousefi Seyf, Axel Funke, Nicolaus Dahmen
Summary: This study evaluated the ability of the group-contribution model to predict the solubility and phase equilibria of phenolic compounds, and used the NIST-UNIFAC model to evaluate the phase equilibria behaviors of quaternary systems. The partition coefficients of lignin-derived molecules were successfully predicted, and promising solvent systems for the separation of lignin products were identified. Additionally, the NIST-UNIFAC model could qualitatively predict suitable solvent systems for the separation of specific compounds.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Daniela Millan, Felipe Gonzalez-Turen, Josei Perez-Recabarren, Christopher Gonzalez-Ponce, Marcos Caroli Rezende, Andre M. Da Costa Lopes
Summary: In this study, different organic solvents and their aqueous mixtures were used for lignin extraction from Pinus radiata sawdust. The results showed that adding a small amount of water could increase the extraction yield, but the yield decreased as the water content increased. The purity of the extracted lignins was analyzed, and it was found that the solute-solvent interactions had a significant influence on the extraction effectiveness.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Polymer Science
Debao Li, Letian Qi, Mengru Yang, Yujie Gu, Yu Xue, Jiachuan Chen, Ming He, Guihua Yang
Summary: In this study, switchable ionic liquids were synthesized and screened to improve the polarity and recyclability of deep eutectic solvents. By coupling with hydrogen-bond donors, a switchable-DES system with modified properties, such as viscosity, conductivity, and pH, was formed, leading to enhanced solubility of lignin compounds and improved molecular weight and uniformity. This proposed system has potential applications in the fractionation of lignin compounds and downstream industrial processes.
Article
Chemistry, Multidisciplinary
Lara Lavrencic, Uttam Dhawa, Arthur Blumenstein, Xile Hu
Summary: Significant research efforts have been focused on the development of catalytic methods for lignocellulose depolymerization in the field of lignin biorefining. However, the conversion of obtained monomers into higher value-added products remains a key challenge in lignin valorization. In this study, copper-catalyzed reactions were utilized for benzylic functionalization of lignin-derived phenolics via the formation of hexafluoroisopropoxy-masked para-quinone methides (p-QMs). By controlling the rates of copper catalyst turnover and p-QM release, various unsaturated fragments suitable for further synthetic applications were successfully installed onto lignin-derived monomers.
Article
Engineering, Chemical
Qian Liu, Xianglan Zhang
Summary: This study proposes a systematic method for screening promising deep eutectic solvents (DESs) as extractive solvents, and verifies the reliability of the conductor-like screening model for real solvents (COSMO-RS) using experimental data. The research identifies chlorocholine chloride (CChC): acetic acid (AA) and choline chloride (ChCl): ethylene glycol (EG) as the optimal DESs for the separation of m-cresol/cumene. Extraction experiments confirm the high separation performance of these DESs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Zeynep Sumer, Reid C. Van Lehn
Summary: In this study, computational methods were used to predict solvent-lignin interactions, providing guidance for lignin separation and utilization. Solvents that promote lignin dissolution regardless of composition were identified, as well as solvents capable of selectively isolating lignin fractions enriched in certain subunits.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Chemical
Jianping Li, Christos T. Maravelias, Reid C. Van Lehn
Summary: In this study, a computational framework is proposed to predict the thermodynamic properties of lignocellulose-derived bioproducts through an adaptive conformer selection method combined with COSMO-RS calculations, enabling improved screening of solvent systems for liquid-phase separation.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Hao Qin, Zhen Song, Zhiwen Qi, Kai Sundmacher
Summary: This study presents a comparative screening of organic solvents (OS) and ionic liquids (ILs) for the extraction of vitamin E from methylated oil deodorizer distillates. The ternary liquid-liquid equilibria (LLE) and physical properties of solvents are calculated and assessed to identify the top-ranked solvents. Binary solvent systems are also explored to intensify the separation performance, and the notable advantages of the binary solvent system are proven through comparison of extraction performance.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Polymer Science
Kostas Parkatzidis, Silja Boner, Hyun Suk Wang, Athina Anastasaki
Summary: Producing polymers from renewable resources is increasingly important. In this study, a photoinduced iron-catalyzed atom transfer radical polymerization (ATRP) method was used to successfully polymerize monomers obtained from biobased renewable resources, resulting in sustainable polymers with controlled molecular weights. This approach offers better molecular weight control and distribution compared to other methods.
Article
Chemistry, Physical
Yuting Liu, Huifang Liu, Ning Li, Feng Wang
Summary: This study reports a novel photocatalytic strategy for the oxidative C-C cleavage of lignin and β-O-4 derivatives using photoredox organocatalysts. High yields of aromatic aldehydes and phenyl formate were obtained, and mixed binary organic solvents were shown to promote bond cleavage and inhibit over-oxidation side reactions. The absorbance, excitation, and interaction with the lignin model of the photocatalyst in different solvents were investigated, and a C-centered radical intermediate was captured, providing evidence for the direct Cα-Cβ bond cleavage mechanism.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
Richa Chaudhary, Paresh L. Dhepe
Summary: The study focuses on the catalytic upgradation of aromatic monomers derived from lignin depolymerization for sustainable fuel and chemical production. It compares the effects of different basic supports for metal catalysts (Pt, Pd, Ru) on the upgradation of phenol, guaiacol, and eugenol. The presence of strong basic sites and the TON levels of metal catalysts play crucial roles in catalytic activity and product formation.
Article
Biochemistry & Molecular Biology
Chen Wu, Yumeng Yang, Kaiqi Sun, Dan Luo, Xiuyu Liu, Huining Xiao, Huiyang Bian, Hongqi Dai
Summary: Organic solvent fractionation was used to improve the UV absorption performance and color of industrial lignin for better utilization as a UV shield. The physicochemical properties of lignin and lignin-based sunscreens were analyzed and compared, and the soluble fraction showed significantly better color and UV-shielding properties than the original and insoluble fractions. The composite sunscreen with 5 wt% acetone fractionated lignin exhibited the highest sun protection factor (SPF) value of 6.6, approximately 4.5 times higher than sunscreens with pristine lignin. This study highlights the potential of industrial lignin in value-added applications such as UV protection and cosmetics.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Multidisciplinary
Ines L. D. Rocha, Andre M. da Costa Lopes, Sonia P. M. Ventura, Joao A. P. Coutinho
Summary: This study utilized a PEG/NaPA ABS system assisted CPC for the separation of lignin-derived monomers, showing that ILs are more suitable than inorganic salts for compound partition in CPC. Alkaline conditions were found to enhance the partition of vanillic acid, and pH was identified as a crucial factor in the separation of lignin monomer compounds.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Review
Chemistry, Organic
Serena Perrone, Francesco Messa, Antonio Salomone
Summary: Hydrogenation processes, which add two hydrogen atoms to unsaturated bonds, are widely used in the manufacture of bulk and fine chemicals. However, these reactions have typically been carried out in volatile and often toxic organic solvents derived from petroleum. This review describes recent advances in reducing methodologies that aim to use sustainable and benign solvents derived from renewable sources, without sacrificing process efficiency and selectivity. Important aspects of green chemistry, such as catalyst recovery and product isolation, have been considered in the choice of these methodologies.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
