Optimized hydrogenation-catalytic cracking combination process

Abstract

The invention relates to an optimized hydrogenation-catalytic cracking combination process, comprising the following steps: wax oil raw materials react in a hydrotreating reaction area; obtained hydrogenation wax oil is taken as catalytic cracking raw oil and directly enters a catalytic cracking unit without being fractionated; catalytic heavy cycle oil circulates back the hydrotreating reaction area; gas phase material flow at the top of a high-pressure hot separator, catalytic light cycle oil and optional crude diesel oil enter a hydrogenation upgrading reaction area carry out hydrogenationupgrading reaction; and reaction products thereof are fractionated to obtain hydrogenation naphtha and hydrogenation diesel. A hydrotreating unit and a hydrogenation upgrading unit shares a hydrogensystem, the device investment and operation cost are lowered, the product scheme is flexible, and high-quality low-sulphur gasoline, high-quality diesel and reforming raw materials can be produced atthe same time.

Description

technical field [0001] The invention belongs to a method for treating hydrocarbon oil with a hydrotreating process and an other conversion step, more specifically, an optimized hydrotreating-catalytic cracking combined process. Background technique [0002] With the increasing scarcity of oil resources and the tendency of crude oil to become heavier and worse, how to use limited resources to produce light products with high demand has become a hot spot in the development of oil refining technology. Refining technology that can improve the yield and quality of target products has become the choice of many refineries. [0003] In the processing flow of the refinery, the main technical means to realize the conversion of heavy oil are catalytic cracking, hydrocracking and coking. In my country, catalytic cracking has been widely used due to its good operational flexibility, high gasoline yield and low one-time investment. On the other hand, due to the needs of environmental pr...

AI Technical Summary

Problems solved by technology

On the other hand, in order to increase the conversion rate and light oil yield of catalytic cracking, the heavy cycle oil (HCO) produced by the catalytic unit is usually circulated in the catalytic cracking unit itself, but due to the high content of HCO aromatics, its cracking effect is not Not ideal, a large part of HCO is converted into coke, which increases the regenerator load, reduces the processing capacity of the catalytic cracking unit and the yield of gasoline and diesel products

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