A catalytic diesel conversion process

Abstract

The invention discloses a conversion technology for catalytic diesel. The conversion technology comprises the following steps that (1) mixed materials of catalytic cracking diesel and hydrogen enter ahydrogenation reactor for hydrofining reaction; (2) hydrofining reaction effluent directly enters a cracking reactor and is subjected to contact reaction with hydrocracking catalyst beds in the cracking reactor, wherein a hydrocracking reactor is filled with an upper hydrocracking catalyst bed and a lower hydrocracking catalyst bed in a grading manner, a catalyst of the upper bed takes W-Ni and / or Mo-Ni as an active metal component and takes a modified Y molecular sieve and / or alkali metal or alkaline earth metal modified aluminum oxide as a carrier, and a catalyst of the lower bed takes Mo-Co as an active metal component and takes the modified Y molecular sieve and carbon deposit aluminum oxide as a carrier; and (3) the hydrocracking reaction effluent obtained in the step (2) is subjected to separation and fractionation so as to obtain a naphtha component and a diesel component. According to the conversion technology, on the premise that the conversion rate of the catalytic diesel isbetter met, the hydrogenation saturation of a generated gasoline component is reduced, and the octane value of the gasoline component is increased.

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, ...

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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

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