Inferior diesel oil hydrodesulfurization method

Abstract

The invention discloses an inferior diesel oil hydrodesulfurization method. Under the hydrofinishing condition, raw materials diesel oil and hydrogen are mixed and pass through four reaction zones in order; reaction products are cooled and enter a separation system so as to obtain a liquid product and a hydrogen-rich gas. A first catalyst is filled in a first reaction zone; a mixture of the first catalyst and a second catalyst are filled in a second reaction zone; the second catalyst is filled in a third reaction zone; and the first catalyst is filled in a fourth reaction zone, wherein the first catalyst is an Mo-Co catalyst and the second catalyst is a W-Mo-Ni catalyst or W-Ni catalyst. According to the invention, catalysts of different types and different hydrogenation activities are subjected to reasonable grading, and advantages of each catalyst at different desulphurization stages are fully performed. Through synergism of the catalysts, the whole catalyst activity is raised; and under a mild operational condition, ultra-low sulfur diesel oil, the sulfur content of which meets the European IV standard, can be obtained.

Description

[0001] technical field [0002] The invention belongs to a hydrogenation method for producing low-sulfur diesel oil, in particular to a method for producing low-sulfur diesel oil by combining different types of hydrogenation refining catalysts. [0003] Background technique [0004] In recent years, with the increasingly stringent environmental regulations and the enhancement of human awareness of environmental protection, in order to reduce sulfide (SO X ) pollution, it is necessary to limit the sulfur content in fuel oil. In this regard, our country is in line with the world. Taking Beijing as an example, the National I standard was implemented for vehicle fuel oil in 1999, the National II standard was implemented in 2004, the National III standard was implemented in 2006, and the National IV emission standard was implemented in 2008. The content requirement is less than 50μg / g. It can be seen that the production of high-quality low-sulfur diesel oil is an inevitable tr...

AI Technical Summary

Problems solved by technology

However, in order to meet the increasing demand for fuel oil in my country, the quantity of high-sulfur crude oil imported by China is also increasing, and with the decreasing oil resources, the quality of crude oil will become worse and worse

However, the use of conventional hydrorefining catalysts can also meet the requirement of deep desulfurization, but it must be at the expense of more severe reaction conditions and reduced processing capacity.