STUDY ON CHEMICAL HYDROGEN CONSUMPTION IN HIGH-GRAVITY MICROBUBBLE-ENHANCED DIESEL HYDROFINING PROCESS

Abstract

Abstract: A high-gravity (HiGee) microbubble upward-flow liquid-phase hydrogenation reactor was utilized for the hydroprocessing of blended diesel feedstock. Under a operating conditions of 8 MPa pressure and a hydrogen-to-oil volume ratio of 150, the contents of sulfides, nitrides and aromatic compounds in the hydrogenation products were quantified at different axial positions of the reactor. Hydrogen consumption associated with hydrodesulfurization (HDS), hydrodenitrogenation (HDN) and aromatics saturation (HDA) reactions was calculated via the chemical equation method, followed by the establishment of a hydrogen consumption kinetic model. Results showed that at the initial reaction stage, the HiGee microbubble process exhibited distinct superiority in sulfide and nitride removal; however, its hydrogen consumption was higher than that of the conventional process, with HDA hydrogen consumption accounting for a substantial proportion of the total hydrogen consumption. As the reaction proceeded, the discrepancy in hydrogen consumption between the two processes gradually narrowed. Kinetic analysis revealed slightly lower apparent activation energies and higher reaction rate constants for all reactions in the microbubble process compared with the conventional process, confirming its enhanced reaction kinetics. With rising reaction temperature, the hydrogen consumption of all reactions increased overall for both liquid-phase hydrogenation processes. However, the mass transfer advantage of the microbubble process diminished with increasing temperature, leading to a progressive reduction in its hydrogen?consumption difference relative to the conventional process. By effectively enlarging the gas-liquid mass transfer area, the HiGee microbubble technology intensifies the hydrogenation process and improves hydrogen utilization efficiency, providing a theoretical foundation for the optimization and industrial application of diesel liquid-phase hydrogenation processes.

Key words: high-gravity microbubbles, liquid-phase hydrogenation, chemical hydrogen consumption, hydrodesulfurization, hydrodenitrogenation, aromatics saturation

References

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