Aromatic Monomer Production from Lignin Depolymerization Predicted from Bond Cleavage Data for Lignin Model Compounds

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  • YAMAGUCHI Aritomo
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST)
  • MIMURA Naoki
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST)
  • SHIRAI Masayuki
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST) Chemistry Course, Faculty of Science and Engineering, Iwate University
  • SATO Osamu
    Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST)

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  • リグニンモデル化合物の分解挙動から予想されるリグニン解重合反応による芳香族モノマー製造

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Abstract

<p>Lignin depolymerization to form useful aromatic compounds has attracted considerable research attention. Depolymerization of lignin, a complex three-dimensional polymer consisting of aromatic monomers, requires cleavage of C–O–C ether bonds and C–C bonds between the monomers. Previously, we reported the bond cleavage characteristics of several lignin model compounds during treatment with supported metal catalysts in supercritical water in the absence of hydrogen gas. Here, we used our model compound data to predict the yields of aromatic monomers from treatment of lignin (derived from hardwood and softwood biomass) with supported metal catalysts (Pd/C, Rh/C, Pt/C, and Ru/C) in supercritical water. The calculated yields decreased in the order Pd/C>Rh/C>Pt/C>Ru/C, and the calculated yields from hardwood biomass were higher than those from softwood biomass. We also compared the calculated yields with the experimental yields for depolymerization of organosolv-lignin powder. The experimental yields decreased in the same order as the predicted yields but were lower than the predicted yields, possibly because repolymerization during decomposition of the lignin model compounds may have been much less than during lignin decomposition.</p>

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