High nitrogen raw material hydrocracking method

Abstract

The present invention relates to a high nitrogen raw material hydrocracking method, which is characterized in that a high nitrogen heavy distillate oil is adopted as a raw material; a two stage process is adopted; under a hydrorefining condition, a heavy distillate oil raw material and hydrogen are mixed and enter a first stage reaction zone, wherein the first stage reaction zone adopts a hydrorefining catalyst, and a nitrogen removing rate is controlled to 60-95%; the effluent of the first stage reaction zone is subjected to gas-liquid separation, the separated gas phase is subjected to impurity removing so as to be recycled, and the liquid phase is subjected to fractionation to obtain a light oil product and tail oil; the tail oil and hydrogen are mixed and enter a second stage reaction zone, wherein the second stage reaction zone adopts a hydrorefining catalyst and a hydrocracking catalyst; and the reaction effluent of the second stage reaction zone enters a separation system. Compared to the existing two stage hydrocracking technology, the high nitrogen raw material hydrocracking method of the present invention has the following advantages that: the process is flexible, and poor quality raw materials can be processed. Compared to the existing one stage series connection hydrocracking technology, the high nitrogen raw material hydrocracking method of the present invention has the following advantages that: processing capacity of the device can be substantially improved. In addition, the method can be operated under relatively mild conditions so as to easily improve an operation period of the hydrogenation device.

Description

technical field [0001] The invention discloses a hydrocracking method, in particular to a two-stage hydrocracking method for processing high-nitrogen 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 2009, there were more than 30 sets of hydrocracking units in operation in my country, with a total processing capacity of more than 40.0Mt / a, ranking first in 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 raw materials, especially...

AI Technical Summary

Problems solved by technology

[0005] In view of the deterioration of crude oil quality, the increase of impurity content, and the development of crude oil vacuum 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 is relatively high. 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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