Method for grading catalyst for hydrogenating coal tar

Abstract

The invention relates to a catalyst for hydrogenating coal tar, and particularly relates to a method for grading a catalyst for hydrogenating coal tar. The catalyst is prepared from a hydrogenation protective catalyst, a hydrodemetallization catalyst, a mild hydrofining catalyst, a mild hydrocracking catalyst and a deep hydrofining catalyst. By adopting the device, three fixed bed refining reactors are distributed in series, the hydrogenation protective catalyst and the hydrodemetallization catalyst are respectively put into the upper bed layer and the lower bed layer of the first reactor; themild hydrofining catalyst is respectively put into three bed layers of the second reactor; the mild hydrocracking catalyst is put into the upper bed layer of the third reactor; and the deep hydrofining catalyst is put into middle and lower bed layers of the third reactor. By adopting the catalyst grading method, pretreated coal tar is subjected to hydrofining treatment on the fixed bed hydrogenation device, and hydrofining generated oil can be used as a raw material oil for producing high density aviation kerosene and low-freezing diesel.

Description

technical field [0001] The invention relates to a catalyst for hydrotreating coal tar, in particular to a catalyst gradation method for hydrotreating coal tar. Background technique [0002] The mixed product oil produced by hydrofining treatment of coal tar contains more naphthenes and aromatics containing naphthenic rings, and is a kind of feedstock oil that is more suitable for the production of high-density aviation kerosene and low freezing point diesel. However, the coal tar hydrogenation industrial units that have been built at present cannot produce hydrorefined oil that can be used as high-density aviation kerosene and low-condensation point diesel feedstock oil. [0003] Over the past ten years, dozens of industrial units have been built successively in China to produce naphtha fractions and diesel blending fractions using coal tar as raw material and using fixed-bed hydrotreating technology. Coal tar is a by-product of the coal dry distillation process, and its co...

AI Technical Summary

Problems solved by technology

It is difficult to meet the quality requirement that the sulfur and nitrogen content of the oil produced by coal tar hydrofining are less than 3ppm by using the catalyst grading method of hydrogenation protection catalyst-hydrodemetallization catalyst-moderate hydrofinishing catalyst-deep hydrofinishing catalyst

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