Inferior diesel oil hydro-upgrading and hydrofining combined method

Abstract

The invention discloses an inferior diesel oil hydro-upgrading and hydrofining combined method. A diesel oil raw material is firstly subjected to aromatic hydrocarbon extraction to obtain an aromatichydrocarbon fraction and a non-aromatic fraction; the non-aromatic fraction enters a hydro-upgrading reaction zone under hydro-upgrading conditions, hydro-upgrading materials passing through a hydro-refining catalyst bed layer and a hydro-upgrading catalyst bed layer enters a hot high-pressure separator for obtaining of a gas phase and a liquid phase, and the liquid phase is subjected to separation and fractionation, so that high-quality naphtha and high-quality diesel oil products are obtained; and the gas phase of the hot high-pressure separator is mixed with the aromatic hydrocarbon fraction, the formed mixture enters a supplementary hydrofining reaction zone under hydrofining process conditions, and a supplementary hydrofining material flow obtained by a hydrofining catalyst bed layeris continuously subjected to gas-liquid separation and fractionation, so that a high-quality FCC feed is obtained. According to the invention, firstly the hydrogenation combined method for simultaneously producing two or more diesel fractions with different meshes by one set of hydrogenation process device is provided, heat carried by a part of hydrogenation modification materials can be fully utilized, and the effective utilization of energy is realized.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a method for flexibly producing high-quality diesel products and high-quality FCC raw materials by using low-quality diesel oil as raw material oil to flexibly produce high-quality diesel products and high-quality FCC raw materials. 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 m...

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

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