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Chemistry and Industry of Forest Products ›› 2023, Vol. 43 ›› Issue (1): 63-71.doi: 10.3969/j.issn.0253-2417.2023.01.008

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Carbon Stable Isotope Fractionation of 5-Hydroxymethylfurfural from Hydrothermal Liquefaction

Qin CHENG1,2, Juanzhang SHEN1, Yanyan CAI1, Jun YE1, Ziyang WU1, Weihong TAN1,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; Key Lab. of Biomass Energy and Material, Jiangsu Province; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
  • Received:2021-12-16 Online:2023-02-28 Published:2023-02-28
  • Contact: Weihong TAN E-mail:tanweihong71@163.com


In this work, the carbon isotopic fractionation characteristics of feedstocks with different stable carbon isotopic compositions during hydrothermal liquefaction for preparation of 5-hydroxymethylfurfural(5-HMF) were compared, and the effect of carbon stable isotope composition of raw materials on the yield of 5-HMF was studied. The results showed that the maximum yield of tapioca starch was 33.90%, which is higher than those of corn starch(29.93%), poplar cellulose(P-C, 31.00%), and corn straw cellulose(CS-C, 30.76%), respectively. The maximum yields of bamboo flour and poplar were 13.00% and 13.80%, which were higher than those of corn straw(11.6%) and corn cob(12.53%), respectively. At the reaction time of 15 min, the reaction rate of different raw materials: tapioca starch 0.301 g/(L·min) was greater than corn starch 0.128 g/(L·min), poplar cellulose 0.513 g/(L·min) was greater than corn straw cellulose 0.386 g/(L·min), and bamboo powder 0.133 g/(L·min) was greater than poplar 0.124 g/(L·min), which was greater than corn cob 0.117 g/(L·min) and greater than corn straw 0.097 g/(L·min). In the reaction process, the change rate of δ13C value of raw materials with smaller δ13C value(cassava starch, poplar cellulose, poplar and bamboo powder) in the initial stage of reaction was greater than that of raw materials with larger δ13C value(corn starch, corn straw cellulose, corn straw and corn cob). There was a stable isotope kinetic effect in the hydrothermal liquefaction process. The 13C isotope required more energy to participate than the enriched raw materials in the reaction, the reaction rate was slow, and the yield of 5-HMF was low. In the process of liquefaction, the stable isotope fractionation of raw material with a simple structure has a great influence. The greater degree of liquefaction, the greater degree of change of δ13C.

Key words: hydrothermal liquefaction, lignocellulose biomass, carbon isotope fractionation, 5-hydroxymethylfurfural, compound specific isotope analysis

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