Low energy consumption and long period hydrogenation process for producing diesel oil

Abstract

The invention discloses a low energy consumption and long period hydrogenation process for producing ultralow-sulfur diesel oil. The hydrogenation process comprises the following steps: (a) fractionating diesel raw oil to obtain two fractions, namely a light fraction and a heavy fraction; (b) carrying out a hydro-desulfurization reaction on the heavy fraction diesel raw oil obtained in the step (a) in a first hydrogenation reaction zone under the action of a hydro-desulfurization catalyst; (c) reacting the material flow obtained in the step (b) with the light fraction diesel raw oil obtained in the step (a) in a second hydrogenation reaction zone under the action of a hydro-desulfurization catalyst; and (d) separating the material flow obtained in the step (c) into a gas phase and a liquidphase, and separating the liquid phase to obtain gas, naphtha and diesel oil products. The hydrogenation process has the advantages of low energy consumption, long operation period and the like.

Description

technical field [0001] The invention belongs to a hydrogenation process in oil refining technology, in particular to a hydrogenation process for producing diesel oil with low energy consumption and long period. Background technique [0002] At present, the energy on a global scale mainly comes from fossil energy, among which petroleum is the most important source of motor fuel. With the continuous development of the world economy and the increasingly stringent environmental regulations, it is necessary to produce a large amount of light and clean motor fuel, all of which require the improvement and improvement of the existing refining technology. As an important motor fuel, diesel quality requirements are getting higher and higher, especially for indicators such as sulfur content, density, cetane number and polycyclic aromatic hydrocarbons. [0003] Diesel hydrogenation technology is the most important means to improve the quality of diesel products. CN102465021A discloses...

AI Technical Summary

Problems solved by technology

[0004] To sum up, in the prior art, since diesel raw materials contain a large amount of sulfur in the form of organic sulfur, the hydrodesulfurization process requires a certain reaction temperature, especially after long-term operation in order to maintain the removal rate of sulfur. Temperature raising operation consumes a lot of energy and affects the operation cycle of the device

Images