Sinopec has applied for a patent for a method that enables efficient and flexible desulfurization and denitration of high-nitrogen diesel under simpler processes, without the need for liquid-phase circulation and thus with lower energy consumption

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Sinopec has applied for a patent for a method that enables efficient and flexible desulfurization and denitrification of high-nitrogen diesel under simpler processes, with no need for liquid-phase circulation and thus lower energy consumption. According to information from the Intellectual Property Office, dated August 7, 2025, Sinopec Corporation and Sinopec (Dalian) Petrochemical Research Institute Co., Ltd. have filed a patent titled “A Method for Desulfurization and Denitrification of High-Nitrogen Diesel”, with the publication number CN120424682A; the application was submitted in February 2024. The patent abstract indicates that the present invention discloses a method for desulfurization and denitration of high-nitrogen diesel, which includes the following: A fixed-bed reactor is equipped, from top to bottom, with a first catalyst bed and a second catalyst bed; the first catalyst bed contains a precious metal catalyst, while the second catalyst bed contains a hydrofining catalyst ； The mixed feed of recycled hydrogen and diesel feed enters the reactor between the first catalyst bed and the second catalyst bed, while fresh hydrogen enters from the upper part of the reactor and comes into contact with the first catalyst bed. The hydrogen is dissociated into active hydrogen, which then diffuses across the surface into the second catalyst bed where it mixes with the diesel feed, resulting in hydrodesulfurization, denitration, and dearomatization reactions ； The hydrogenation reaction products flow out from the bottom.