Method for hydrogenating residual oil

Abstract

The invention provides a method for hydrogenating residual oil. The method comprises the steps of firstly carrying out hydrogenating protection reaction on the raw material residual oil in a hydrogenating protection device so as to obtain hydrogenating protection products, then, carrying out hydrotreating reaction on the hydrogenating protection products in a hydrotreater so as to obtain hydrotreating products, and finally, carrying out separation on the hydrotreating products in a separating unit, thereby obtaining recycle hydrogen and a product. The method is characterized in that the hydrogenating protection products are divided into gas-phase and liquid-phase products, the gas-phase product is directly mixed with the hydrotreating products, then, separation is carried out, part of the liquid-phase product is mixed with a mixed hydrogen raw material, the hydrogenating protection reaction is carried out, and the other part of the liquid-phase product is fed to a hydrotreating reactor for hydrotreating reaction. Compared with the prior art, the method provided by the invention has the advantages that the lives of a hydrotreating catalyst and a hydrogenating protection catalyst can be prolonged, and the selectivity of a target product of the hydrogenating protection reaction is improved.

Description

technical field [0001] The invention relates to the technical field of processing residual oil by hydrogenation technology. Background technique [0002] Today, as the whole society calls for sustainable development and green environmental protection, oil refining companies are facing the competitive pressure of rising crude oil prices, heavier and worse crude oil properties, rising demand for light oil products, and stricter fuel oil and environmental protection standards. It is also getting bigger and bigger, and the advanced processing of crude oil and clean fuel production technology will be further developed rapidly, and will still be the main direction of the world's refining technology development. [0003] In terms of deep processing of crude oil, it is the main purpose of refiners to convert residual oil into light transportation fuel oil and chemical raw materials to the maximum extent. The deep processing of residual oil requires vigorous development of hydrogena...

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Problems solved by technology

[0004] CN1393515A discloses a treatment method for hydrogenation of residual oil, which includes passing the raw material of residual oil through a hydrogenation protection reactor and a hydrogenation treatment reactor for hydrogenation reaction of residue oil, but the method does not disclose the hydrogenation protection reactor interior layout

However, the gas phase volume fraction of this scheme is much greater than the liquid phase volume fraction, so that the average flow rate of the mixed phase increases significantly, and the pressure drop of the circulating hydrogen system in the heat exchanger and heating furnace tube is increased. The pressure drop in the reactor and other equipment, the total pressure difference of the circulating hydrogen system often becomes the main limiting factor for the large-scale single series of the device

At the same time, due to the large flow rate of circulating hydrogen, if the pressure drop of the system is too high, the energy consumption level of the device will be greatly increased

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