Production method of low-sulfur and low-freezing-point diesel

Abstract

The invention discloses a production method of low-sulfur and low-freezing-point diesel. The production method comprises the following steps: (1) completely mixing low-quality diesel raw materials and a powdered Mo-Co type hydrorefining catalyst in a mixer to obtain mixed feeding materials of the catalyst and the raw material oil; (2) enabling the mixed feeding materials and hydrogen to enter a boiling-bed reactor from the bottom of the reactor to perform hydrogenation reaction, wherein the reactor is filled with a hydrodewaxing catalyst and a Mo-Ni type hydrorefining catalyst; (3) discharging material flow containing the powdered Mo-Co type hydrorefining catalyst after the reaction out of the top of the boiling-bed reactor and entering a stabilized reactor to perform hydrofinishing; and (4) performing solid-liquid separation on the material obtained in the step (3) and enabling liquid phase to enter a fractionating system to obtain the low-sulfur and low-freezing-point diesel product. By the method provided by the invention, the temperature reduction in the hydrodewaxing process and the temperature increment in the hydrogenation process are combined and utilized reasonably, so while the low-freezing-point and ultralow-sulfur diesel is produced, the hot-spot temperature of the device is reduced, the operating cycle is prolonged and the operating cost is saved.

Description

technical field [0001] The invention relates to a production method of low-sulfur and low-condensation diesel oil, in particular to a production method for producing high-quality low-sulfur and low-condensation diesel oil through a fluidized 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 range can reach 20-50°...

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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