Combination method of hydro-upgrading and hydro-refining of low-quality diesel oil

Abstract

The invention discloses a combined method of hydrogenation upgrading and hydrogenation refining of low-quality diesel oil. The diesel feedstock is firstly extracted with aromatics to obtain aromatic fractions and non-aromatic fractions; the non-aromatic fractions enter the hydro-upgrading reaction zone under hydro-upgrading conditions, and are separated by hydrofining catalyst bed and hydro-upgrading catalyst bed. The hydrogenated and upgraded material enters the hot high-pressure separator to obtain gas phase and liquid phase. The liquid phase is separated and fractionated to obtain high-quality naphtha and high-quality diesel products; In the hydrofinishing reaction zone, the supplementary hydrofinishing stream obtained through the hydrofinishing catalyst bed continues to undergo gas-liquid separation and fractionation to obtain high-quality FCC feed. The present invention provides for the first time a combined hydrogenation method for simultaneously producing two or more diesel fractions with different purposes on a set of hydrogenation process equipment, which can make full use of the heat carried by partial hydrogenation-upgrading materials and realize effective utilization of energy.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a flexible diesel hydrogenation upgrading and hydrorefining combined method for flexibly producing high-quality diesel products and high-quality FCC raw materials by using inferior diesel oil as raw material oil. Background technique [0002] The increasingly stringent environmental regulations require the quality of diesel products to be higher and higher, mainly due to the increasing restrictions on sulfur content, cetane number, density and condensed aromatic hydrocarbon content. The low-quality diesel hydro-upgrading technology can greatly reduce the sulfur content and aromatic content of diesel products, reduce the density and improve the cetane number. Fluidized Catalytic Cracking (FCC) is one of the important means of lightening heavy oil, but with the deterioration and heaviness of FCC raw materials, its operating conditions are becoming more and more severe,...

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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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