An inferior diesel oil hydro-upgrading and hydrofining combined process

Abstract

The invention discloses an inferior diesel oil hydro-upgrading and hydrofining combined process. A diesel oil raw material is fractionated to obtain a light fraction and a heavy fraction; the light fraction is subjected to extraction with aromatic hydrocarbon to obtain a light aromatic hydrocarbon fraction and a light non-aromatic hydrocarbon fraction; the heavy fraction enters a hydrofining reactor, and the material passing through a first hydrofining catalyst bed layer is divided into two streams; one material stream enters a separator, and the obtained liquid is extracted out of the hydrofining reactor and enters a hydro-finishing reactor together with the light aromatic hydrocarbon fraction for a hydro-finishing reaction; the other material stream is mixed with the light non-aromatic fraction and then flows downwards through a second hydrofining catalyst bed layer; a hydrofined material flow enters a hydro-upgrading reactor; and a hydro-upgrading reaction product and a hydro-finishing reaction product are respectively subjected to gas-liquid separation and fractionation to obtain high-quality diesel oil products and high-quality FCC feed materials. The invention provides the hydrogenation combined process for simultaneously producing more than two kinds of diesel fractions with different purposes on a set of hydrogenation process equipment.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a flexible diesel hydrogenation upgrading and hydrofining combined process for flexibly producing high-quality diesel products and high-quality FCC raw materials by using low-quality diesel oil as raw material oil. 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. Fluid Catalytic Cracking (FCC) is one of the important means of lightening heavy oil, but with the deterioration and heavyness of catalytic cracking raw materials, its operating conditions are becoming more and more strin...

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Problems solved by technology

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

CN101875856A, CN102465035A and CN106701189A, CN106701190A disclose a process technology for blending LCO in wax oil hydrotreating or residual oil hydrotreating process, the main purpose is to produce high-quality catalytic cracking raw materials, or let LCO be used in wax oil hydrotreating unit Coupling technology with circulation between catalytic cracking units realizes clean production of catalytic cracking units. However, since wax oil and LCO are directly hydrogenated after mixing, the depth of hydrogenation of LCO cannot be effectively controlled, and only mixed hydrogenation products (catalytic cracking raw materials ) sulfur content or nitrogen content as the control target, which is not conducive to the effective control of LCO production of high-quality gasoline

The above process technology is not combined with the aromatics extraction technology, and there is usually only one type of diesel product produced, and the product flexibility is poor

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