A Flexible Diesel Hydrogenation Upgrading Process

Abstract

The invention discloses a flexible diesel hydrogenation upgrading process. After the diesel raw material is hydrogenated and refined, it enters the hydrogenation upgrading reactor, and the material passing through the upper hydrogenation upgrading catalyst bed is divided into two strands; one strand of material is extracted from the upgrading reactor through the middle of the bed, and enters the hydrogenation isothermal The isomerization depreciation reaction is carried out in the structure depreciation reactor; another stream of material continues to flow down through the lower hydrogenation modification catalyst bed; Separation and fractionation to obtain diesel products of different specifications. The invention provides a hydrogenation upgrading process for simultaneously producing two or more diesel products of different specifications on a set of hydrogenation process equipment, which can fully utilize the heat carried by part of the upgrading materials to realize the hydrogenation upgrading reactor and Coupling operation of hydroisomerization depreciation reactors.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a diesel hydrogenation upgrading process for flexibly producing high-quality diesel products. Background technique [0002] The increasingly stringent environmental protection regulations require higher and higher quality diesel products, mainly due to the increasing restrictions on sulfur content, cetane number, density and polycyclic aromatic hydrocarbon content. Low-quality diesel hydro-upgrading technology can greatly reduce the sulfur content and aromatics content of diesel products, reduce density and increase cetane number. In addition, in winter, diesel products in cold regions have different restrictions and requirements on the freezing point. According to the freezing point, diesel products in my country can be divided into 5#, 0#, -10#, -20#, -35# and -50 # and other different specifications. Hydrogenation decondensation technology can effectively reduce ...

AI Technical Summary

Problems solved by technology

[0004] Distillate fraction hydroisomerization depreciation technologies, such as CN1718683A and CN1712499A, etc., use hydrofinishing catalysts and hydroisomerization depreciation catalysts containing zeolite β, and adopt a series of processes to produce diesel products, but under the same hydro-upgrading conditions The cetane number is lower than that of hydrogenated diesel oil, and the process conditions for the same low-condensation-point diesel products are harsher than those of hydrogenated decondensation process

[0005] To sum up, the existing diesel hydrotreating technology can obtain a higher yield of diesel products, and the product quality is greatly improved, such as cetane number, sulfur content, aromatics content, density, etc., but the freezing point is lowered The range is not large or does not decrease, which cannot meet the requirements of low pour point diesel oil

The existing hydroisomerization pour point depressing technology can greatly reduce the freezing point of diesel products, which can meet the index requirements of low freezing point diesel, but the yield is low when producing low freezing point diesel products

There is only one kind of diesel product produced by the above process technology, and the product flexibility is poor

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