Catalytic diesel hydroconversion process

Abstract

The invention discloses a hydro-conversion process for catalytic diesel oil. The hydro-conversion process comprises the following steps: (1) firstly putting a mixture of catalytic diesel oil and hydrogen into a hydrogenation reactor to have a hydrofining reaction; (2) enabling a hydrofining reaction effluent to directly enter a cracking reactor to contact and react with a hydrocracking catalyst bed in the cracking reactor; wherein upper and lower hydrocracking catalyst beds are graded and loaded in a hydrocracking reactor, a catalyst of the upper bed takes W-Ni and / or Mo-Ni as the active metalcomponent, a catalyst of the lower bed takes Mo-Co as the active metal component, and a modified Y molecular sieve and carbonized alumina are taken as carriers; (3) separating and distilling the hydrofining reaction effluent obtained in the step (2) to obtain a naphtha component and a diesel component, wherein the naphtha component is directly discharged out of a device to serve as high-octane gasoline blending component, the diesel component is directly discharged out of the device to serve as a blending diesel, and the naphtha component and the diesel component can also be recycled back inthe cracking reactor for further reaction. The process reduces the hydrogenation saturation of the generated gasoline component and increases the octane number of the gasoline component on the premiseof better meeting the conversion rate of the catalytic diesel oil.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation treatment, in particular to a catalytic diesel oil hydrogenation conversion process. Background technique [0002] Since the beginning of the new century, with the increasing awareness of environmental protection, the stricter national environmental protection regulations and the rapid development of the national economy, the demand for clean motor fuels has been increasing all over the world. Catalytic cracking (FCC) technology is one of the main technological means for lightening heavy oil, and it occupies a relatively important position in oil refining enterprises all over the world. The annual processing capacity of catalytic cracking units in my country has exceeded 100 million tons, second only to the United States. In the composition of gasoline and diesel products, catalytic cracking gasoline accounts for about 80%, and catalytic diesel oil accounts for about 30%. In recent years, ...

AI Technical Summary

Problems solved by technology

However, this method cannot selectively reduce the hydrogenation saturation of gasoline components, so the octane number loss of gasoline products is relatively large

[0005] EP20110834653 discloses a method for preparing a polycyclic aromatic hydrocarbon hydrogenation conversion catalyst. The catalyst carrier is composed of β molecular sieve and pseudo-boehmite. The active metal components of Group VIB and Group VIII are added by conventional methods, but the catalyst is also Strong saturation ability for gasoline components, which is not conducive to the process of catalytic diesel hydrogenation conversion to produce high-octane gasoline

Images