Hydrogenation modification method of distillate oil

Abstract

A hydrogenation / modification method of distillate oil comprises the following steps: mixing a raw material oil with hydrogen, contacting with a hydrogenation / modification catalyst in a first hydrogenation reaction area to obtain a reaction product, directly feeding the reaction product into a second hydrogenation reaction area without separation, reacting in the presence of a hydro-refining catalyst to obtain a reaction product in the second hydrogenation reaction area, cooling the reaction product in the second hydrogenation reaction area, separating, and fractionally distilling to obtain diesel fraction and naphtha fraction, wherein the hydrogenation / modification catalyst contains silicon oxide-aluminum oxide, Y-zeolite, aluminum oxide, at least one metal component selected from the VIII group and at least one metal component selected from the VIB group. The method provided by the invention can modify poor catalytic cracking diesel with high contents of sulfur, nitrogen and aromatics at high air speed and under middle pressure, and the modified diesel fraction has higher cetane number than the raw material by above 10 units and greatly reduced contents of sulfur (less than 50 mug / g), polycyclic aromatic (less than 11wt%) and nitrogen.

Description

technical field [0001] The invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, it belongs to a method for hydrogenation and upgrading of diesel fractions. Background technique [0002] As international crude oil prices continue to rise, in order to reduce procurement costs, domestic refineries have made imported crude oil worse and worse, and the properties of secondary processed oil, especially catalytic cracked diesel oil, which accounts for more than 1 / 3 of the diesel pool, are also becoming more and more inferior. The worse it is, the main performance is that the sulfur content, nitrogen content and aromatics content gradually increase, and the cetane number further decreases. [0003] At the same time, with the improvement of people's living standards, our country pays more and more attention to the environment, and the corresponding fuel specifications are gradually stricter. On July 1, 2005, Euro II diesel standa...

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Problems solved by technology

However, the raw material used in this method is relatively light, and the content of aromatics is low; in addition, the use of noble metal catalysts in this method increases the cost, increases the risk of operation, and reduces the flexibility of operation

[0010] As can be seen from the above cited documents, there are two cases of using noble metal catalysts and non-noble metal catalysts in the prior art, and the use of noble metal catalysts has problems such as high investment costs, high operating costs, and complicated operations. At the same level of mass, there is a problem of lower airspeed

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