A kind of inferior heavy distillate oil hydrocracking method

Abstract

The present invention discloses a poor-quality heavy distillate oil hydrocracking method. According to the method, poor-quality heavy distillate oil and hydrogen gas enter a first-stage reaction zone to carry out a hydrorefining reaction, the reaction effluent enters a separator to separate, the obtained liquid enters a second-stage reaction zone to carry out a hydrorefining reaction, the second-stage reaction effluent and supplement hydrogen gas are mixed and then enter a third-stage reaction zone to carry out a hydrocracking reaction, and the hydrogenation reaction effluent is subjected to separation and fractionation to obtain various hydrocracking products. 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 inferior heavy distillate oil. 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 and chemical ra...

AI Technical Summary

Problems solved by technology

[0005] With the deterioration of crude oil quality, the increase of impurity content, and the development of crude oil decompression deep pressure and other unconventional energy sources, the impurity content of hydrocracking raw materials is getting higher and higher, especially the nitrogen content of some hydrocracking raw materials However, when the existing hydrocracking method deals with the hydrocracking feedstock with high nitrogen content, it requires a higher reaction temperature or a lower operating space velocity, which reduces the processing capacity of the device, increases energy consumption, and shortens the operation cycle

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