Method and device for producing ultra-low sulfur diesel fuel by liquid phase hydrogenation

Abstract

The present invention relates to a method and an apparatus for producing ultra low sulfur diesel oil through liquid-phase hydrogenation. The apparatus comprises a hydrogenation reactor, a steam stripping separator, a trickle-bed reactor, a gas pipeline, a heat exchanger 1, an air cooler, a circulation pump, a heat exchanger 2, a heat exchanger 3, a cold low-pressure separator and a hot low-pressure separation tank, wherein a catalyst bed layer and a hot high-pressure separator are arranged inside the trickle-bed reactor. According to the present invention, a diesel oil raw material is subjected to a hydrogenation reaction in the hydrogenation reactor, the reaction product is separated in the steam stripping separator to obtain a liquid product, one part of the liquid product returns to the hydrogenation reactor, the other part of the liquid product is mixed with supplemented hydrogen, the obtained mixture is subjected to a second-stage hydrogenation reaction in the trickle-bed reactor, the second-stage hydrogenation reaction product is directly subjected to second-stage hot high-pressure separation to obtain a liquid product, the obtained liquid product is subjected to heat exchange, and the product being subjected to the heat exchange enters the hot low-pressure separation tank; and the second-stage hydrogenation reactor and the second-stage hot high-pressure separator are additionally arranged, the diesel oil raw material is subjected to the first-stage hydrogenation, the obtained raw material is continuously subjected to the deep hydrogenation reaction, and the sulfur content in the diesel oil being subjected to the two-stage hydrogenation is reduced to less than or equal to 10 ppm so as to improve the quality grade of the diesel oil product.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a method and equipment for hydrogenation of hydrocarbons, and to a method and device for producing ultra-low-sulfur diesel oil through liquid-phase hydrogenation. Background technique [0002] The production of clean diesel with low sulfur, low aromatics, low density and high cetane number will be the general trend of diesel production worldwide in the future. How to meet the increasingly stringent automotive diesel standards and produce clean diesel that meets environmental protection requirements will It has become an important subject of refining technology progress. The quality upgrade of diesel fuel mainly controls the sulfur content. With the improvement of people's awareness of environmental protection and the increasingly stringent environmental regulations, the production and use of clean vehicle fuels has become a development trend. The development of diesel d...

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Problems solved by technology

"However, this technology cancels the circulating hydrogen system, and most of the hydrogen sulfide generated after the reaction is completed exists in the oil, so that the oil contains a large amount of hydrogen sulfide, which has a great inhibitory effect on the further desulfurization reaction of oil products. It can only produce automotive diesel with a sulfur content of less than 50ppm, which meets the National IV diesel standard, but cannot meet the requirements for the production of ultra-low sulfur automotive diesel (with a sulfur content of less than 10ppm)

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