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Deep Hydrotreatment of Coal-Derived Liquid by Denitrogenation Pretreatment

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Abstract

The combination of denitrogenation pretreatment and deep hydrotreatment was examined to produce clean transportation fuel from nitrogen-rich coal liquid. Heavier fraction (recovery yield; 13.1 wt%) of coal liquid was separated by distillation and denitrogenated by extractions with CuCl2 · 2H2O, sulfuric acid, furfural and their combinations. Effectiveness of the treatments for nitrogen reduction was increased as following; H2SO4 (48.0%) < CuCl2 ⋅ 2H2O (75.0%) < furfural (80.0%) < H2SO4/furfural (85.0%) < CuCl2 ⋅ 2H2O/furfural (92.0%). The hydrotreatment tests using a batch-type autoclave showed that the hydrodenitrogenation of the heavier oil was promoted by the denitrogenation pretreatment with an order of furfural < H2SO4 < CuCl2 ⋅ 2H2O < H2SO4/furfural < CuCl2 ⋅ 2H2O/furfural. The combined treatment with CuCl2·2H2O and furfural was the most effective for both its nitrogen reduction and enhancement of the following hydrodenitrogenation. As a result, the first-order hydrodenitrogenation rate increased by 4.4, and the nitrogen content was reduced to 11 wtppm or 230-fold compared with those of the untreated heavier oil. Mixtures of refined heavier oils and heavier-cut coal liquid were also hydrotreated and similar tendencies were obtained.

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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  1. Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Peace Avenue, Bayanzurkh district, 13330, Ulaanbaatar, Mongolia

    J. Narangerel, A. Ariunaa, O. Nasantogtokh & E. Puntsagdash

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  1. J. Narangerel
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  2. A. Ariunaa
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  3. O. Nasantogtokh
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  4. E. Puntsagdash
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Narangerel, J., Ariunaa, A., Nasantogtokh, O. et al. Deep Hydrotreatment of Coal-Derived Liquid by Denitrogenation Pretreatment. Solid Fuel Chem. 57 (Suppl 1), S27–S34 (2023). https://doi.org/10.3103/S0361521923070078

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