Deep desulfurization system and desulfurization method thereof

Abstract

The invention discloses a deep desulfurization system, which comprises a first hydrogenation reactor and a second hydrogenation reactor which are connected through a pipeline. An upper catalyst bed ofthe first hydrogenation reactor comprises a dense-phase desulfuration / dearomatization catalyst, and a flaky compacted top catalyst, an annular demetalization protective agent, an annular silicon protective agent, a clover-shaped demetalization protective agent and a clover-shaped silicon protective agent which are dilute phases. A lower catalyst bed of the first hydrogenation reactor comprises adense-phase desulfuration / dearomatization catalyst. An upper catalyst bed of the second hydrogenation reactor comprises a dense-phase desulfurizer. A lower catalyst bed of the second hydrogenation reactor comprises a dense-phase desulfurizer. The desulphurization system of the invention has two hydrogenation reactors which are arranged in succession. Raw oil is subjected to a hydrofining reactionthrough the first hydrogenation reactor and then the product immediately enters the second hydrogenation reactor to continuously undergo hydrofining. With the cooperation of different catalyst selections, deep desulfurization is realized, and product indexes are greatly improved.

Description

Technical field [0001] The invention relates to the field of petroleum production technology, in particular to a low-sulfur diesel and naphtha produced by using the materials of coking coke, straight-run gasoline, coking diesel, straight-run diesel, and catalytic diesel as raw materials and adopting hydrorefining technology The desulfurization method. Background technique [0002] In the context of sustainable development, low-carbon and environmental protection, in order to cope with global warming, countries around the world have increasingly stringent requirements for low-carbon, energy-saving and clean and environmentally friendly petroleum products (mainly gasoline and diesel) in the production process. The United States currently implements a standard that the sulfur content of clean diesel is less than 15μg / g. In 2009, the European Union implemented a more stringent automotive fuel oil standard than the United States, and the standard requires a sulfur content of less tha...

AI Technical Summary

Problems solved by technology

With the prolongation of the operation time of the diesel hydrogenation unit, the activity of the hydrodesulfurization catalyst will decrease, thus affecting the product quality

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