Abstract
The effects of various factors on the hydrodegumming (HDG) of oil during the deep hydrogenation of coal-based aerospace kerosenee (CBAK) were studied by single factor experiment and response surface methodology (RSM) analysis on a fixed-bed hydrogenation unit with the existent gum content as the observation value. The results show that in order to achieve better HDG effect of CBAK, it must be carried out at high reaction temperature (T), high reaction pressure (P) and low liquid hourly space velocity (LHSV). The influence of various factors on the gum content of hydrogenated oil was analyzed by using the Design Expert software. The influence degree order was as follows: LHSV > P > T. At the same time, the process conditions of deep hydrogenation were optimized by simulation: P = 11.91 MPa, LHSV = 1.60 h−1, V(H2)/V(Oil) = 800, T = 619.84 K, under which the expected gum content was 0.26 mg (100 mL)−1. On this basis, according to the speed of CBAK-HDG reactivity, the existent gum in the raw material were divided into three lumps, which are high reactivity, medium reactivity, and slow reactivity, then the three lumped kinetic model of CBAK-HDG was established. The kinetic parameters of the model were calculated by Levenberg–Marquardt method, and the model was verified by the measured data. The experimental results show that the average relative error of the model is 8.28%, the predicted value is reliable and the extrapolation is quite good. The calculation results of the model parameters correspond to the results of RSM, which is consistent with the hydrogenation reaction law. The results of this study are expected to provide some theoretical basis and reference for the further study of coal-based space kerosene hydrofining process and the optimization of operation conditions of industrial units.
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Abbreviations
- CBAK:
-
Coal-based aerospace kerosene
- HDG:
-
Hydrodegumming
- RSM:
-
Response surface methodology
- T :
-
Reaction temperature (K)
- P :
-
Reaction pressure (MPa)
- LHSV :
-
Liquid hourly space velocity (h−1)
- V(H2)/V(Oil):
-
Volume ratio of hydrogen-oil
- t :
-
Reaction time (h)
- x i :
-
The ratio of lump-i gum content to total gum content in the feedstock (%)
- k i0 :
-
Pre-exponential factor of Arrhenius equation of lump-i (h−1)
- k i :
-
Apparent reaction rate constant of lump-i
- w 0 :
-
Gum content in feed (mg (100 mL)−1)
- w G :
-
Gum content in product (mg (100 mL)−1)
- w i 0 :
-
Gum content of lump-i in feed (mg (100 mL)−1)
- w i :
-
Gum content of lump-i in product (mg (100 mL)−1)
- E i :
-
Activation energy of lump-i (kJ mol−1)
- a i :
-
Correction factor for reaction pressure of lump-i
- b i :
-
Correction factor for reaction time of lump-i
- n :
-
Number of experiments
- R :
-
Universal gas constant (kJ mol−1 K−1)
- \(\overline{{E_{r} }}\) :
-
The average relative error (%)
- SSR:
-
Sum of Squares due to residuals
- \(w^{{{\text{Cal}}}}\) :
-
Calculated gum content of experimental sample i (mg (100 mL)−1)
- \(w^{{{\text{Exp}}}}\) :
-
Experimental gum content of experimental sample i (mg (100 mL)−1)
- \(y_{{{\text{HDG}}}}^{i}\) :
-
The removal rate of gum after hydrodegumming of lump-i (%)
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Acknowledgements
The financial supports of this work are provided by the National Natural Science Foundation of China (21978237), Key Research and Development Program of Shaanxi (Program No. 2018ZDXM-GY-161), The Technology Innovation Leading Program of Shaanxi (Program No. 2019CGHJ-11), the Key Scientific Research Plan (Key Laboratory)of Shaanxi Provincial Department of Education(Program No. 17JS146), Science and technology plan of Xi'an aerospace special chemical material engineering technology research center (Program No. 165MEC2019-01).
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Tian, F., Zhu, Y., Liu, J. et al. Optimization and lumped kinetic model study of coal-based aerospace kerosene hydrogenation process. Reac Kinet Mech Cat 130, 753–775 (2020). https://doi.org/10.1007/s11144-020-01813-9
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DOI: https://doi.org/10.1007/s11144-020-01813-9