Hydrocarbon oil catalytic cracking method and equipment

Abstract

The invention relates to a hydrocarbon oil catalytic cracking method which is characterized by comprising the following steps of: (1) carrying out first contact reaction on a hydrocarbon oil raw material and a first cracking catalyst in a lifting pipe reactor and carrying out first oil separation on a mixture of oil gas and a catalyst obtained after the first contact reaction; (2) carrying out a second contact reaction on the oil gas obtained after the first oil separation and a newly added second cracking catalyst in a fluidized bed reactor and carrying out second oil separation. The invention also provides hydrocarbon oil catalytic cracking equipment. On one hand, the problem of inadequate activity in the fluidized bed reactor, caused by the great reduction of the activity of the catalyst discharged out of the lifting pipe reactor, can be avoided, on the other hand, because the product obtained after reaction in the lifting pipe reactor is directly conveyed into the fluidized bed reactor without separation, the defect of increase of energy consumption, caused by repeated cooling and gasifying of feed materials can be avoided.

Description

technical field [0001] The invention relates to a hydrocarbon oil catalytic cracking method and hydrocarbon oil catalytic cracking equipment. Background technique [0002] Catalytic cracking is one of the most important secondary processing methods in the field of petroleum refining. [0003] Judging from the development in recent years, catalytic cracking technology will continue to develop around the following main aspects: [0004] Process heavy raw materials. Due to the growing demand for light oil and the increase in crude oil prices, the use of catalytic cracking technology to process heavy and low-quality feedstock oils such as atmospheric residues, vacuum residues, coker wax oils and deasphalted oils can yield greater economic benefits. How to solve the problems of serious heavy metal contamination of the catalyst and high coke yield when processing heavy raw materials is an important direction in the development of catalytic cracking technology. [0005] A new p...

AI Technical Summary

Problems solved by technology

However, due to the gas-solid co-current flowing against the gravity field, there is a large axial and radial flow inhomogeneity in the riser, large gas-solid backmixing, uneven residence time distribution, etc., and the coke generated during the reaction is deposited on the catalyst. On the surface and active center, the activity of the catalyst drops sharply

Studies have shown that the current catalyst activity at the outlet of the riser is only about 1 / 3 of the initial activity, and the reaction takes about 1 second, and the catalyst activity drops by about 50%.

In this way, in the second half of the riser reactor, the activity of the catalyst drops sharply, the catalytic effect is greatly weakened, the thermal cracking reaction increases, more dry gas is produced and the olefin content of gasoline is increased.

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