Two-stage hydrotreating method of high dry point raw material

Abstract

The present invention discloses a two-stage hydrotreating method of a high dry point raw material. According to the present invention, a high dry point raw material firstly enters a first-stage reaction zone to carry out a hydrorefining reaction, a gas-liquid co-current flow process and a gas-liquid counter flow process are concurrently adopted in the first-stage reaction zone, and the generated oil obtained in the first-stage reaction zone enters a second-stage reaction zone to carry out a deep hydrogenation reaction; with the method of the present invention, the hydrotreating can be performed on the high dry point raw material under the relatively mild condition so as to make the high dry point raw material meet the catalytic cracking raw material requirement, such that the hydrotreating raw material source is broadened; and with the method of the present invention, the hydrotreating temperature can be reduced so as to increase the operation period of the device and process the poor-quality raw material, or increase the processing capacity of the device in the same operation period.

Description

technical field [0001] The invention discloses a hydrogenation treatment method, in particular to a two-stage hydrogenation treatment method for processing raw materials with high dry point. Background technique [0002] With the depletion of crude oil resources in the world, the international oil price has been hovering at a high level, so that the proportion of crude oil procurement cost in the total refining cost has risen sharply, and the profit margin of oil refining enterprises has been greatly reduced. Since 2009, my country has imported more than 200 million tons of crude oil annually, and its dependence on crude oil imports has exceeded 50%, which has seriously threatened the healthy and rapid development of the national economy. Making full use of crude oil resources has become an important task for the oil refining industry. At the same time, with the increasing awareness of environmental protection, increasingly stringent environmental protection regulations, the...

AI Technical Summary

Problems solved by technology

CN101007964A discloses a hydrogenation method for producing high-quality catalytic cracking raw materials, but its operating pressure is low, and it is not suitable for processing high-dry point raw materials. CN101987967A discloses a method for hydrogenation treatment of vacuum deep wax oil, using two-stage process , but the first stage uses very weak hydrogenation protection agent and demetallization protection agent, and the second stage uses hydrodesulfurization and hydrodenitrogenation catalysts. When processing raw materials with high dry point, the overall activity of the catalyst is low. The processing volume is not high, or the processing depth is not high

In addition to slowing down the diffusion of raw oil into the catalyst due to the increase in viscosity, thereby reducing the reaction rate, it also brings more non-hydrocarbon compounds with more complex structures, polycyclic aromatic hydrocarbons, gums, asphaltenes, and heavy metals. and other impurities, greatly increasing the difficulty of hydrogenation

However, when the existing hydrogenation treatment method handles the hydrogenation raw material with high dry point, higher reaction temperature, higher reaction pressure or lower operating space velocity are required, the processing capacity of the device decreases, and the energy consumption increases simultaneously, and the operation cycle shorten

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