Method for producing clean diesel oil with low condensation point by treating inferior diesel oil

Abstract

The invention discloses a method for producing clean diesel oil with a low condensation point. The method comprises the following steps: mixing a diesel oil raw material with hydrogen, orderly passing through at least two hydrogenation reaction zones connected in series, wherein in the material flowing direction, each hydrogenation reaction zone orderly comprises a hydrodewaxing catalyst composite bed layer filled with a mixture of a hydrodewaxing catalyst and a hydro-refining catalyst, and a simple hydro-upgrading catalyst bed layer; performing separation and fractionation of the reaction effluent from the last hydrogenation reaction zone to obtain the clean diesel oil product with a low condensation point, and a few light naphtha and liquefied gas products. The method of the invention reasonably combines and utilizes the temperature decrease of the hydrodewaxing process with the temperature increase of the hydro-refining and hydro-upgrading process, improves the diesel oil yield while producing diesel oil with a low condensation point and low sulfur, reduces the hot-spot temperature of the device, prolongs the running period, also reduces the cold hydrogen consumption or the combustion gas loss of a heating furnace, and saves operation cost.

Description

technical field [0001] The invention relates to a method for producing clean low-pointing diesel fuel by treating inferior diesel oil, in particular to a hydrogenation method for producing clean low-pointing point diesel fuel 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 the modern production and life process, and can be used as vehicles, tanks, airplanes, tractors, railway vehicles and other vehicles or other machinery. Fuel can also be used to generate electricity, heat and so on. According to the different industries and environments, users have very different quality requirements for diesel products. For people living in alpine regions or in winter, the demand for low freezing point diesel has always been high. The shape cracking process can process waxy heavy diesel fractions, and the pour point reduction r...

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. This method is to adjust the properties of the catalyst so that the effect of diesel decondensation is good and the yield of diesel fractions is high. The combination process, the contradiction between the pour point depressing effect and the diesel fraction yield still exists

[0007] CN102453531A has introduced a kind of method of diesel oil hydrodepreciation, although the average reaction temperature of hydrodepreciation catalyst has been improved, and the temperature rise of refining agent has been used to increase the utilization rate of depreciation catalyst, but the reaction at the outlet of each bed layer The temperature is still relatively high, and the cycle is somewhat limited

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