Catalytic cracking combined process

Abstract

The catalytic cracking combination process includes the following steps: cooling 10-80 wt% of regenerative agent, feeding it into reaction zone of circulating fluidized bed reactor and making it contact with gasoline to make reaction; then feeding the produced reaction oil-gas into the subsequent gasoline conversion product separation system; feeding the catalyst after which is reacted into stripper zone of the circulating fluidized bed reactor to make stripping; back returning 40-80 wt% of stripped catalyst into reaction zone for circulating use and feeding residual portion into lift pipe reaction and making it mix with non-cooled regenerative agent and can be upward flower along lift pipe under the action of prelift medium; injecting hydrocarbon raw material into lift pipe and making it contact with catalyst, react, and making reactant flow through lift pipe outlet and come into the settler.

Description

technical field [0001] The invention belongs to the catalytic cracking method of petroleum hydrocarbons under the condition of no hydrogen, more specifically, it is a novel catalytic cracking combined process method. Background technique [0002] With the enhancement of global environmental awareness and stricter environmental regulations, controlling vehicle emissions and providing environmentally friendly vehicle fuels have become severe tasks for the oil refining industry in the 21st century. The United States and Europe have proposed an international unified standard for the quality of automobile fuel, in which the benzene content of gasoline is <1v%, the aromatic content is <35v%, the olefin content is <10v%, and the sulfur content is <0.003m%. In the new gasoline specifications and standards implemented in my country, it is stipulated that the benzene content is 2v%, the aromatics content is less than 40v%, and the olefin content is less than 35v%. The cont...

AI Technical Summary

Problems solved by technology

The use of two-zone reaction provides favorable conditions for the hydrogen transfer reaction of catalytic cracking - low temperature, relatively long residence time, but due to the pressure balance problem of the catalytic cracking system, neither the middle nor the top of the riser can form Relatively high dense bed material level, so the effect of the hydrogen transfer reaction actually obtained by this method in the industrial implementation process is not ideal

In addition, since olefins mainly exist in liquefied petroleum gas and gasoline, allowing all reaction oil gases to contact and react with low-temperature catalysts not only reduces the efficiency of the hydrogen transfer reaction, but also adversely affects the product distribution of the catalytic cracking unit

[0007] To sum up, heavy oil conversion capacity and product quality are two important aspects that affect the economic benefits of catalytic units, but there is no report on the catalytic cracking process that can take into account the above two in the prior art

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