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Title: Catalytic conversion of high S-lignin to a sustainable tri-epoxide polymer precursor

Journal Article · · Green Chemistry
DOI: https://doi.org/10.1039/d2gc01278b · OSTI ID:1978898
 [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [2]
  1. Univ. of California, Santa Barbara, CA (United States); OSTI
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Department of Chemistry & Biochemistry, University of California, Santa Barbara, Building 232, Santa Barbara, California, 93106-9510, USA

More than 40 million tons of thermosetting plastics are produced annually and 70% of those are epoxy polymers. The synthesis of bio-based epoxide provides a pathway for making renewable thermoset plastics. We describe in this study the use of a genetically modified high-S poplar lignin to produce 4-propyl-2,6-dimethoxyphenol (DMPP), which is converted to the tri-functional compound propylpyrogallol (DMPPO) by a reaction catalysed by N2O5 in the green solvent water. The resulting DMPPO can be converted to a novel tri-epoxide by reaction with epichlorohydrin. Native high-S lignin as well as several organosolv lignins extracted from this poplar biomass were investigated as feedstocks. Notably, direct reductive catalytic fractionation (RCF) of the high-S poplar wood over Pd–Zn/C catalyst with Pd : Zn ratio 1 : 10 at 225 °C under 35 bar H2 in methanol gave the highest yield of biophenol monomers from the lignin present, the major product being DMPP. Under optimized conditions, conversion of DMPP to DMPPO over the Nb2O5 was nearly quantitative (96% yield), and this conversion could be made without extensive prior purification of the DMPP. The Nb2O5 catalyst could be recycled several times before significant deactivation. This sequence of two catalytic reactions demonstrates that the production of epoxides from lignin-derived DMPPO is a realistic strategy for making renewable polymer building blocks from biomass.

Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0019161
OSTI ID:
1978898
Journal Information:
Green Chemistry, Journal Name: Green Chemistry Journal Issue: 12 Vol. 24; ISSN GRCHFJ; ISSN 1463-9262
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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