Method of hydro up grading isomerizing pour point depression to produce diesel oil

Abstract

A process for preparing the clean diesel oil by hydromodifying, isomerizing and lowering pour point features that the fractional oil raw material and H2 pass through a catalyst bed to obtain clean high-quality diesel and the naphtha product with low contents of sulfur and nitrogen and high content of arylhydrocarbon. Said catalyst bed contains hydrocatalyst bed containing beta zeolite (0.5-20 wt.%).

Description

technical field [0001] The invention relates to a method for producing diesel oil through hydrogenation modification, isomerization and decondensation. A catalyst with strong isomerization function is selected, and distillate oil is used to produce decondensed diesel oil. Background technique [0002] The sustained development of the national economy has led to the rapid development of the automobile industry and the transportation industry, especially the faster growth of diesel vehicles, which has also brought about the problem of air pollution caused by vehicle exhaust emissions. In order to effectively control vehicle exhaust emissions and protect the ecological environment on which human beings depend, countries all over the world, especially developed countries, have continuously improved automobile engines and their exhaust gas treatment systems, and at the same time have put forward higher and higher requirements for the quality of diesel products. Requirements, the ...

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Problems solved by technology

[0003] CN1171430A has introduced a kind of method that adopts medium pressure hydrocracking, although the cetane number of diesel oil can be greatly improved, because a considerable part of diesel oil is converted into naphtha fraction, diesel product yield is reduced, and this and The current market demand for increasing the diesel-to-gasoline ratio is contradictory, so its promotion and application are limited

CN1156752A discloses a diesel oil upgrading process, using a hydrocracking catalyst, under the condition of controlling a certain amount of nitrogen, the aromatic hydrocarbons in the diesel oil undergo a ring-opening reaction, which can greatly increase the cetane number of the diesel oil, but cannot effectively reduce the diesel oil. Solidifying point

[0005] In summary, none of the existing technologies can comprehensively improve various performance indicators of diesel and simply produce high-quality clean diesel