Poor-quality raw material hydrocracking method

Abstract

The present invention discloses a poor-quality raw material hydrocracking method. According to the method, a poor-quality raw material is firstly subjected to a first-stage hydrorefining reaction, and the reaction effluent is separated; and the liquid enters a second-stage refining stage to carry out a deep denitrogenation and aromatic hydrocarbon saturation reaction, a gas-liquid co-current flow process and a gas-liquid counter flow process are concurrently adopted in the second stage, the refining generated oil obtained in the second stage and hydrogen gas are mixed and then enter a third-stage reaction zone to carry out a hydrocracking reaction. 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 hydrocracking feeding requirement, such that the hydrocracking 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 hydrocracking method, in particular to a hydrocracking method for processing nitrogen-containing inferior raw materials. Background technique [0002] With the rapid development of my country's economy, the oil processing capacity has grown rapidly. At the same time, domestic hydrocracking technology has also obtained large-scale industrial applications. By the end of 2011, there were more than 40 sets of hydrocracking units in operation in my country, with a total processing capacity of more than 50.0Mt / a, and the processing capacity leapt to the top of the world. second. In addition, due to the year-by-year deterioration of the quality of domestic crude oil, the substantial increase in the processing volume of imported high-sulfur 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 fuel oil an...

AI Technical Summary

Problems solved by technology

[0005] At present, the quality of crude oil is deteriorating, the impurity content is increasing, and the development of crude oil vacuum deep drawing and other unconventional energy sources makes the impurity content of hydrocracking raw materials higher and higher, especially the nitrogen content of certain hydrocracking raw materials. However, when the existing hydrocracking method deals with the hydrocracking feedstock with high nitrogen content, higher reaction temperature or lower operating space velocity is required, the processing capacity of the unit will decrease, energy consumption will increase, and the operation cycle will be shortened

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