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Kinetics towards mechanism and real operation for ultra-deep hydrodesulfurization and hydrodenitrogenation of diesel
  • +5
  • Yachen Yin,
  • Wenbin Chen,
  • Guilian Wu,
  • Feng Xin,
  • Kang Qin,
  • Yutao Lu,
  • Le Zhang,
  • Mingfeng Li
Yachen Yin
Tianjin University
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Wenbin Chen
Research Institute of Petroleum Processing, SINOPEC, 18 Xue Yuan Road
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Guilian Wu
Tianjin University
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Feng Xin
Tianjin University
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Kang Qin
Research Institute of Petroleum Processing, SINOPEC, 18 Xue Yuan Road
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Yutao Lu
Research Institute of Petroleum Processing, SINOPEC, 18 Xue Yuan Road
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Le Zhang
Research Institute of Petroleum Processing, SINOPEC, 18 Xue Yuan Road
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Mingfeng Li
Research Institute of Petroleum Processing, SINOPEC, 18 Xue Yuan Road
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Abstract

As the hydrodesulfurization (HDS) of diesel achieves ultra-deepness, our understanding of its kinetics is still far from in-depth. Therefore, herein, two lumped kinetic models for the ultra-deep hydrodesulfurization (UHDS) and hydrodenitrogenation (HDN) are established based on experiments under a wide range of operating conditions. Meanwhile, a four-lump kinetic model of the aromatic hydrosaturation (AHS) is erected. Our kinetic models disclose thermodynamic decisiveness in UHDS, which is unreachable beyond a temperature upper limit or a pressure lower limit. We also reveals the unexpected temperature dependence of nitrogen inhibition to HDS, for less than 300℃ the nitrogen inhibition becomes even more potent despite nitrogen removal by HDN reactions. Subsequently, the HDS kinetics of total sulfur are deciphered as multi stages exist in the whole reaction coordinate. Accordingly, a four-stage conceptual model involving mechanism and rate laws is proposed to offer a better understanding of nitrogen inhibition, thermodynamics and kinetics in UHDS.

Peer review status:IN REVISION

28 Apr 2020Submitted to AIChE Journal
01 May 2020Assigned to Editor
01 May 2020Submission Checks Completed
12 May 2020Reviewer(s) Assigned
03 Sep 2020Editorial Decision: Revise Major