Journal of Polymers and the Environment

, Volume 26, Issue 8, pp 3493–3501 | Cite as

Completely Bio-based Polyol Production from Sunflower Stalk Saccharification Lignin Residue via Solvothermal Liquefaction Using Biobutanediol Solvent and Application to Biopolyurethane Synthesis

  • Jae Yeong Jung
  • Ju-Hyun Yu
  • Eun Yeol LeeEmail author
Original Paper


Sunflower stalk saccharification lignin residue was converted to a completely bio-based biopolyol via solvothermal liquefaction using acid catalyst. Different isomer-type biobutanediols were used to replace petroleum-derived reaction solvents. The reaction parameters were optimized according to measurement of the biomass conversion and the hydroxyl and acid numbers. The lignin-derived biopolyol with a biomass conversion of 80.1%, hydroxyl number of 819.0 mg KOH/g, and acid number of 26.5 mg KOH/g was produced in the optimal condition (reaction temperature of 120 °C, 4 wt% acid catalyst loading, reaction time of 120 min, and 25 wt% biomass loading). The lignin-derived biopolyol was neutralized to decrease the acid number. The neutralized biopolyol was used to synthesize biopolyurethane via polymerization with poly(propylene glycol), tolylene 2,4-diisocyanate terminated. Urethane bond formation was confirmed by FT-IR analysis. The biopolyurethane showed good thermal properties, such as a Td5 of 273.4 °C, Td10 of 305.8 °C, and a single degradation peak at 387.2 °C.


Sunflower stalk saccharification lignin residue Biobutanediol Solvothermal liquefaction Biopolyol Biopolyurethane 



This work was supported by the R&D Program of the Ministry of Trade, Industry, & Energy (MOTIE)/ Korea Evaluation Institute of Industrial Technology (KEIT) (Project # 10049675). This research was supported by the C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2015M3D3A1A01064882).


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKyung Hee UniversitySeoulRepublic of Korea
  2. 2.Convergence Biochemistry Division, Center for Bio-based ChemistryKorea Research Institute of Chemical TechnologyDaejeonRepublic of Korea

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