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Optimization of reaction variables and macrokinetics for the hydrodeoxygenation of full range low temperature coal tar

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Abstract

The effects of operating conditions on the hydrodeoxygenation (HDO) of full-range low temperature coal tar (LCT) were investigated in a trickle-bed hydrogenation unit. The optimized process conditions analyzed by response surface methodology were found as: reaction temperature of 658.15 K, reaction pressure of 13.51 MPa, liquid hourly space velocity (LHSV) of 0.30 h−1, hydrogen to oil volume ratio of 1100 NL/L. The order of the importance on HDO was: LHSV > temperature > pressure. A new kinetic model for HDO of LCT has been also built based on the power law model. The estimation of model parameter was carried out by using Levenberg–Marquardt method. The results were validated by a series of further experiments. Comparisons between the experimental and predicted data showed good agreement. The relative error and absolute error from the combination kinetic model are both lower than 1.5 %.

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Abbreviations

y HDO :

The hydrodeoxygenation conversion rate of coal tar

LHSV:

Liquid hourly space velocity, h−1

P :

Hydrogen partial pressure, MPa

T :

Reaction temperature, K

k :

Apparent reaction rate constant, (ppm)1−n ha MPa−b

w :

Content of phenols in oil, ppm

t :

Residence time, h

n :

Reaction order

w f :

Content of phenols in feed, ppm

w p :

Content of phenols in product, ppm

a :

LHSV index

b :

Hydrogen pressure index

k 0 :

M, Pre-exponential factor of Arrhenius equation, (ppm)1−n ha MPa−b

E a :

Apparent activation energy, J mol−1

R :

Gas constant, 8.314 J/(mol K)

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Acknowledgments

We gratefully acknowledge the financial support of the National Natural Science Foundation of China (21206136), Overall Science and Technology Innovation Project of Shaanxi province (2014KTCL01-09) and Research Fund for the Doctoral Program of Higher Education of China (20126101120013) and Scientific Research Project of the Department of Education of Shaanxi province (2013JK0692, 2013JC21).

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Authors and Affiliations

  1. School of Chemical Engineering, Northwest University, Xi’an, 710069, China

    Yonghong Zhu, Yonghui Zhang, Yong Dan, Yang Yuan, Linna Zhang, Wenhong Li & Dong Li

  2. Shaanxi Research Center of Chemical Engineering Technology for Resource Utilization, Xi’an, 710069, China

    Yonghong Zhu, Yonghui Zhang, Yong Dan, Yang Yuan, Linna Zhang, Wenhong Li & Dong Li

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  1. Yonghong Zhu
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Correspondence to Dong Li.

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Zhu, Y., Zhang, Y., Dan, Y. et al. Optimization of reaction variables and macrokinetics for the hydrodeoxygenation of full range low temperature coal tar. Reac Kinet Mech Cat 116, 433–450 (2015). https://doi.org/10.1007/s11144-015-0900-x

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