A high-efficiency hydrogenation and upgrading method for inferior diesel oil

Abstract

The invention discloses an efficient hydro-upgrading method for poor diesel fuel. The method comprises the following steps of (1) fully mixing the raw material of poor diesel fuel and a powdery hydrorefining catalyst in a mixer to obtain a mixed feeding material; (2) enabling the mixed feeding material and hydrogen to enter a boiling-bed reactor from the bottom part of a reactor filled with a hydrodewaxing catalyst, a hydro-upgrading catalyst and an isomerization-visbreaking catalyst, so as to implement the hydrogenation reaction; (3) discharging the reaction product comprising the powdery hydrorefining catalyst from the top part of the boiling-bed reactor, enabling the reaction product to enter the stable reactor to supplement hydrorefining; and (4) implementing solid liquid separation on the material, and enabling the liquid phase to enter a fractionating system to obtain a high-quality diesel fuel product. The characteristic of backmixing of the boiling-bed reactor is fully utilized, the temperature drop in the process of hydrodewaxing and the temperature rise in the processes of hydrorefining and hydro-conversion are reasonably utilized, the diesel fuel with low condensation point, ultralow sulfur and high cetane number is produced while the high yield of the diesel fuel is guaranteed, the hot-spot temperature of the device is reduced, and the running period is prolonged.

Description

technical field [0001] The invention relates to a high-efficiency hydrogenation and upgrading method for low-quality diesel oil, in particular to a production method for producing high-quality low-condensation and high-cetane number diesel oil through an ebullated bed reactor. Background technique [0002] Diesel, as a fuel for compression ignition engines, plays an irreplaceable role as a non-renewable resource in modern production and life, and can be used as vehicles, tanks, airplanes, tractors, railway vehicles and other vehicles or other machinery Fuel can also be used for power generation, heating, etc. Depending on the industry and environment in which it is used, the quality requirements of users for diesel products are also very different. For people living in alpine regions or in winter, the demand for low-condensing-point diesel has always been high. The traditional choice The cracking process can process waxy heavy diesel fractions, and the pour point depressing...

AI Technical Summary

Problems solved by technology

In this method, the temperature drop in the bed of the hydrodepreciation catalyst is relatively large, and the yield of the diesel fraction and the improvement of the depreciation effect are limited to a certain extent, which reduces the service life of the hydrodecondensation catalyst.

[0006] CN102051232A introduces a method for diesel hydrotreating decondensation, which has the characteristics of good diesel decondensation effect and high yield of diesel fractions by adjusting the properties of the catalyst. Combined process, conflict between pour point depressing effect and diesel fraction yield still exists

[0008] The reaction temperature at the outlet of each bed layer is still relatively high, and the cycle is limited to a certain extent

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