Production method of high-quality low-pour-point diesel

Abstract

The invention discloses a production method of high-quality low-pour-point diesel. The production method comprises the following steps: (1) adequately mixing a poor-quality diesel raw material with a powdery hydrorefining catalyst in a mixer, so as to obtain a mixed fed material of the catalyst and the raw material diesel; (2) introducing the mixed fed material and hydrogen into a boiling-bed reactor from the bottom of a reactor filled with a hydrodewaxing catalyst, and carrying out hydrogenation reaction; (3) after the reaction of the material containing the powdery hydrorefining catalyst, discharging the material from the top of the boiling-bed reactor, introducing the material into a stable reactor, and carrying out supplementary hydrorefining; and (4) filtering the powdery hydrorefining catalyst from generated diesel, and introducing the diesel into a fractionating system, so as to obtain the high-quality low-pour-point diesel product. By virtue of the method, the yield and cetane number of the diesel are increased when low-pour-point and ultralow-sulfur diesel is produced, the hot-spot temperature of a device is reduced, and the operation cycle is prolonged; and besides, the consumption of cold hydrogen or the fuel gas of a heating furnace is reduced, so that the operation cost is saved.

Description

technical field [0001] The invention relates to a production method of low-condensation diesel oil, in particular to a production method for producing high-quality low-condensation 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 range can reach 20-50°C. While obtaining low pour p...

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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