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A preliminary study on the co-hydrogenation process of coal tar and bio-oil

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Abstract

This study investigates the synergistic effect during the co-hydrogenation process of coal tar and biomass oil through experiments. By conducting hydrogenation experiments on model compounds of coal tar (naphthalene, tetrahydronaphthalene, decalin, and 9,10-phenanthrene) and waste soybean oil, it was found that partially saturated and fully saturated polycyclic aromatic hydrocarbons release active hydrogen atoms due to dehydrogenation at high temperatures. These active hydrogen atoms can promote the hydrogenation conversion of fatty acids derived from triglycerides in waste soybean oil during the co-hydrogenation process with coal tar. Through co-hydrogenation experiments of coal tar and waste soybean oil, it was discovered that when coal tar was first hydrogenated under conditions of temperature of 360 °C, pressure of 8 MPa, and LHSV (liquid hourly space velocity) of 0.4 h−1, and then mixed with waste soybean oil (at a concentration of 30 g/100 mL) for hydrogenation under the conditions of temperature of 360 °C, pressure of 8 MPa, and LHSV of 0.4 h−1, the deoxygenation conversion rate of fatty acids in the soybean oil is 94.5%. The hydrogenation deoxygenation conversion rate of the product in this process was 87.5% higher than that of individual fatty acids. This study indicates that the co-hydrogenation of hydrogenated coal tar and bio-oil promotes the deoxygenation conversion of bio-oil.

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Acknowledgements

The financial supports of this work are provided by the National Natural Science Foundation of China (22308277), Key Research and Development Program of Shaanxi Province (2024GX-YBXM-494), Scientific Research Program Funded by Shaanxi Provincial Education Department (Program No.20JK0842).

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Authors and Affiliations

  1. Xi’an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, Xi’an Shiyou University, Xi’an, 710065, People’s Republic of China

    Menglong Niu & Ben Niu

  2. School of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an, 710065, People’s Republic of China

    Menglong Niu & Baoqi Ma

  3. School of Chemical Engineering, Northwest University, Xi’an, 710069, People’s Republic of China

    Liuyi Pan

  4. Spang Technology Co., Ltd, Shanghai, 201210, People’s Republic of China

    Panpan Ji

  5. Shaanxi Coal and Chemical Industry Group Shenmu Tianyuan Chemical Industry Co., Ltd, Yulin, 719319, People’s Republic of China

    Ning Liu

  6. Qingan Group Co., Ltd, Xi’an, 710077, People’s Republic of China

    Yiqing Ge

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  1. Menglong Niu
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Correspondence to Menglong Niu.

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Niu, M., Pan, L., Ji, P. et al. A preliminary study on the co-hydrogenation process of coal tar and bio-oil. Reac Kinet Mech Cat 137, 1667–1682 (2024). https://doi.org/10.1007/s11144-024-02614-0

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