Catalytic cracking apparatus and method for catalytically cracking petroleum hydrocarbon

Abstract

The invention discloses a catalytic cracking apparatus. The catalytic cracking apparatus comprises a riser reactor, a settler and a stripping device; the stripping device is disposed below the settler, and the stripping device and the settler are integrally formed and are coaxial; the riser reactor penetrates the bottom of the stripping device and stretches into the settler; the settler is inside provided with a cyclone separator for oiling-agent separation; the lower-part chamber of the settler is inside provided with a sleeve with an upper opening and a lower opening, and the sleeve is coaxial with the settler; the outlet of the riser reactor is disposed in the sleeve in order to form a fluidized-bed reaction zone in the sleeve; and a catalyst outlet of the cyclone separator is disposed in a space formed by the outer wall of the sleeve and the inner wall of the settler. The invention also provides a method for catalytically cracking petroleum hydrocarbon. Through the above technical scheme, the catalysis efficiency of the fluidized-bed reactor in the catalytic cracking apparatus is substantially improved, and therefore the low-carbon olefin yield of catalytic cracking is improved.

Description

technical field [0001] The invention relates to the petrochemical field, in particular to a catalytic cracking device and a method for catalytic cracking petroleum hydrocarbons. Background technique [0002] Carbon olefins are important chemical raw materials. At present, the leading technology for producing ethylene and propylene worldwide is steam cracking. About 95% of ethylene and more than 60% of propylene are obtained through this technology. From a global perspective, naphtha is used as cracking raw material for 48%, ethane accounts for 33%, propane accounts for 8%, butane accounts for about 5%, oil and gas account for 4%, and others account for about 2%. In the steam cracking process, due to the absence of catalysts, the cracking of hydrocarbons requires relatively harsh operating conditions, resulting in high production and device construction costs, and the crude oil is becoming heavier and the shortage of light hydrocarbon raw materials is becoming more and more s...

AI Technical Summary

Problems solved by technology

[0005] In conventional catalytic cracking units, the utilization rate of the fluidized bed reactor is low, resulting in the defect of low yield of low-carbon olefins in the existing catalytic cracking units

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