Catalytic cracking method

Abstract

The invention relates to a catalytic cracking method which comprises the following steps: a heavy raw material is in contact with a catalyst containing shape-adaptive zeolite with the average pore size of less than 0.7nm in a first riser reactor with at least two reaction zones to perform cracking reaction; and a light raw material and cracked heavy oil are in contact with the catalyst containing shape-adaptive zeolite with the average pore size of less than 0.7nm in a second riser reactor and a fluidized bed reactor to perform cracking reaction. The method is used for the catalytic cracking of heavy oil; and the conversion rate of heavy oil and the yield of propylene are higher, and the yields of dry gas and coke are low.

Description

technical field

[0001] The invention relates to a catalytic cracking method. Background technique

[0002] Small molecule olefins such as ethylene, propylene and butene are the most basic raw materials for organic synthesis. At present, the production of small molecular olefins in the world mainly adopts the steam cracking method, but because the high temperature cracking furnace is easy to coke, this method is only suitable for processing light raw material oils, such as natural gas, naphtha and light diesel oil. Due to the relatively heavy crude oil in my country and the low yield of naphtha and other light oils, the contradiction between supply and demand of raw materials for steam cracking and catalytic reforming has become increasingly serious. Since the mid-1980s, Sinopec Research Institute of Petroleum and Chemical Industry has been engaged in the research of catalytic cracking family technology for producing light olefins from heavy oil, and successfully developed t...

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