Method for producing light olefins and monocyclic aromatic hydrocarbons from heavy hydrocarbons

Abstract

The invention provides a method for producing light olefins and monocyclic aromatic hydrocarbons from heavy hydrocarbons. The method produces qualified catalytic cracking raw materials through hydrogenation by taking wax oil and residual oil as raw materials, returns light cycle oil and heavy cycle oil which are catalytic cracking by-products to a hydrogenation unit for the catalytic cracking rawmaterials at the same time, hydrogenates the catalytic cracking by-products together with the catalytic cracking raw materials, and then takes the obtained product as the catalytic cracking raw materials to produce light olefins and monocyclic aromatic hydrocarbons. By introducing the residual oil before a second reaction zone of hydrogenation, the method widens the sources of the catalytic cracking raw materials, increases the processing amount of low-value residual oil, and solves the problem of the heat balance of catalytic cracking units. The light and heavy cycle oil of catalytic cracking is introduced into the hydrogenation unit, hydrogenated and then taken as the catalytic cracking raw materials, so that the yield of high-value products of the catalytic cracking units can be increased, and the deactivation of hydrogenation catalysts is delayed.

Description

technical field

[0001] The present invention belongs to a method for treating hydrocarbon oil with a hydrotreating process and another conversion step, more specifically, it is a method for producing light olefins and single-ring aromatics from heavy hydrocarbons with a hydrogenation-catalytic cracking combined process method. Background technique

[0002] The world's demand for light olefins and aromatics is increasing day by day. The method for producing low-carbon olefins, especially propylene, includes catalytic cracking processes in addition to steam cracking methods. At present, catalytic cracking mainly uses hydrogenated or unhydrogenated vacuum distillate as raw material for cracking. For the method of maximizing the production of propylene from the deep cracking of heavy hydrocarbons as the raw material, if the raw material is not hydrogenated, it will not be conducive to environmental protection and cannot achieve a higher propylene yield. Hydrogenation of catal...

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