Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 22-30.DOI: 10.1016/j.jechem.2022.12.017

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Synthesis of high density and low freezing point jet fuels range cycloalkanes with cyclopentanone and lignin-derived vanillins

Xinghua Zhang*, Miaojia Song, Jianguo Liu, Qi Zhang, Lungang Chen, Longlong Ma*   

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2022-05-09 Revised:2022-12-24 Accepted:2022-12-26 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: zhangxh@seu.edu.cn (X. Zhang), mall@seu.edu.cn (L. Ma).

Abstract: In this work, a ‘‘cyclopentanone-vanillin” strategy was proposed for the preparation of jet fuel range cycloalkanes from lignocellulose-derived ketones and lignin-derived aldehydes via aldol condensation and hydrodeoxygenation (HDO). Ethanolamine lactate ionic liquid (LAIL) exhibited excellent catalytic activity in the aldol condensation of cyclopentanone and vanillin. Desired mono-condensation and bi-condensation products were obtained with yield of 95.2% at 100 °C. It is found that the synergy effects between amino group of ethanolamine and hydroxyl group of lactic acid play a key role in the aldol con-densation. The condensation products were converted into cycloalkanes by HDO over 5%Pd/Nb2O5 cata-lyst. The density of the obtained HDO products is 0.89 g/cm3 and the freezing point is lower than —60 °C. These results suggest that the resulted cycloalkanes can be used as additives to improve the density and low-temperature fluidity of the jet fuels.

Key words: Aldol condensation, Cyclopentanone-vanillin, Ionic liquid catalysts, Hydrodeoxygenation, Jet fuel