A kind of production method of low condensation diesel oil

Abstract

The invention discloses a production method of low-condensation point diesel oil. The production method comprises following steps: diesel oil raw material and hydrogen are mixed, an obtained mixture is delivered through at least two hydrogenation reaction zones in series connection successively, wherein along a material flowing direction, each hydrogenation reaction zone comprises a hydrogenation modification catalyst bed layer, and a condensation point reducing catalyst composite bed layer filled with a hydrogenation modification isomerization condensation point reducing catalyst and a hydrodewaxing catalyst; a reaction effluent obtained from the last hydrogenation reaction zone is subjected to separation and fractionation so as to obtain low-condensation point diesel oil. According to the production method, temperature reducing of hydrodewaxing processes and temperature increasing of hydrogenation modification processes are combined reasonably, low-condensation point diesel oil is produced, and yield and cetane value of diesel oil are increased at the same time, equipment hot-spot temperature is reduced, running period is prolonged, consumption of cold hydrogen or combustion gas loss of a heating furnace is reduced, and operation cost is reduced.

Description

technical field [0001] The invention relates to a production method of low-condensation diesel oil, in particular to a hydrogenation method for producing low-condensation diesel oil through catalyst grading technology and composite filling technology. 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. ...

AI Technical Summary

Problems solved by technology

Although this method improves the average reaction temperature of the hydrodepressant catalyst and utilizes the temperature rise of the refined preparation to increase the utilization rate of the depreciation catalyst, the reaction temperature at the outlet of each bed is still relatively high, and the operation period is limited by a certain degree. limits

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