Hydrogenation combined method for diesel oil

Abstract

The invention discloses a hydrogenation combined method for diesel oil, which comprises the following steps: dividing a straight-run diesel oil raw material and/or a coking diesel oil raw material into two parts of materials, performing hydro-upgrading reaction on one part of the material after being mixed with a catalytically cracked diesel oil raw material, and performing hydro-refining reaction on the other part of the material. The hydro-refining reaction and the hydro-upgrading reaction share a set of hydrogen recycling system. The combined method of the invention meets the requirement of products with different amounts and quality by flexibly adjusting raw oil ratio of two reaction zones, reduces operating severity of a hydro-upgrading reaction zone and prolongs the operation cycle at the same time. In addition, the method of the invention simplifies the process flow, can decrease equipment and reduces investment and operation cost. The method is suitable for hydro-processes of various inferior-quality distillate raw materials.

Description

technical field [0001] The invention relates to a combined hydrogenation method for diesel oil, in particular to a combined hydrogenation method for obtaining high-quality products through hydrofining and hydrogenation upgrading of diesel oils with different properties through an optimized process flow. Background technique [0002] The lightening of heavy oil is a benefit increase point for refiners. Coking, catalytic cracking and other heavy oil lightening units with low operating and construction costs are widely available all over the world. Due to my country's market demand and refiners' requirements to improve efficiency, secondary processing technologies such as coking and catalytic cracking are widely used in various refineries, and light distillates produced by these devices, especially diesel fractions, need to be further hydrogenated to meet product specifications. Require. In particular, the development of catalytic cracking technology in the direction of produc...

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Problems solved by technology

[0008] In petroleum processing enterprises, catalytic cracking and coking are the two most important heavy oil lightening processes with the largest processing volume. The quality of distillate oil such as diesel oil obtained by the two processes cannot meet the product quality requirements, especially the density of catalytic cracked diesel oil. Large, high content of aromatics, low cetane number, in the prior art, the diesel fractions obtained by these two processes are usually processed in a mixed manner, or mixed with other sources of diesel raw materials (such as straight-run diesel oil, etc.). Although it has the advantage of simple process, it is not conducive to targeted product modification according to the characteristics of different raw materials and comprehensive improvement of product quality.

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