Two-stage hydrotreating method of poor-quality raw material

Abstract

The present invention discloses a two-stage hydrotreating method of a poor-quality raw material. According to the method, a poor-quality raw material firstly enters a first stage to carry out a hydrorefining reaction, and the reaction effluent is separated; and the obtained liquid enters a second-stage refining stage to carry out a deep denitrogenation and aromatic hydrocarbon saturation reaction, and a gas-liquid co-current flow process and a gas-liquid counter flow process are concurrently adopted in the second stage. With the method of the present invention, the nitrogen-containing impurities in the poor-quality raw material can be subjected to hydrotreating under the relatively mild condition so as to make the poor-quality raw material meet the catalytic cracking raw material requirement, such that the hydrotreating raw material source is broadened; and the hydrorefining temperature is substantially 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 nitrogen-containing inferior raw materials. Background technique [0002] With the rapid development of my country's national economy, the oil processing capacity has grown rapidly. At the same time, the price of crude oil remains high, so that the proportion of crude oil purchase cost in the total refining cost has risen sharply, and the profit margin of refiners has been greatly reduced. In addition, due to the deterioration of crude oil quality year by year, the substantial increase in the processing volume of imported high-sulfur and high-nitrogen crude oil, the increasingly stringent requirements for environmental protection on the refining process and the quality of petroleum products, and the increasing market demand for clean oil products and chemical raw materials, making The market has put forward higher requir...

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-nitrogen raw materials. CN101987967A discloses a method for hydrogenation treatment of vacuum deep wax oil, which adopts two-stage flow process, However, the first stage uses a hydrogenation protection agent and demetallization protection agent with very weak activity, and the second stage uses a hydrodesulfurization and hydrodenitrogenation catalyst. When processing raw materials with high nitrogen content, the overall activity of the catalyst is low. The amount is not high, or the processing depth is not high

However, when the existing hydrogenation treatment method handles the hydrogenation raw material with high nitrogen content, 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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