Catalytic conversion method and device for single-riser petroleum hydrocarbon type raw material

Abstract

The invention discloses a catalytic conversion method and a catalytic conversion device for a single-riser petroleum hydrocarbon type raw material. A catalyst which has a temperature lower than that of a regenerated catalyst is fed into a pre-rising section of a riser reactor and is conveyed into an oil-catalyst contact reaction section by pre-risen gas to be contacted with the raw material for catalytic conversion reaction; and a cooled regenerated catalyst or a reflowed spent catalyst is fed into the riser reactor from the space above a raw material nozzle to participate in the catalytic conversion reaction. By the method and the device, reaction dry gas can be reduced, product distribution can be improved, and the temperature or the catalyst-oil ratio of the riser oil-catalyst contact reaction section and a post-reaction section can be adjusted and controlled, so catalytic conversion has sufficient flexibility to adapt to change of quality of raw material oil or the requirement of a market on products.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a catalytic conversion method and device for petroleum hydrocarbon raw materials with a single riser. Background technique [0002] Fluidized catalytic conversion is an important secondary processing technology in the petrochemical field. Most of the existing fluidized catalytic conversion devices for petroleum hydrocarbon raw materials use riser reactors. [0003] The riser reactor has the advantages of reducing the back-mixing of the reactants and improving the selectivity of the target product, but there are also disadvantages: precisely because it is close to "plug flow" and the catalyst storage is small, there is a temperature effect (endothermic or exothermic ) in the reaction process, it will inevitably cause a large temperature difference, which will affect the control of the reaction temperature and increase the by-products. [0004] In order ...

AI Technical Summary

Problems solved by technology

[0003] The riser reactor has the advantages of reducing the back-mixing of the reactants and improving the selectivity of the target product, but there are also disadvantages: precisely because it is close to "plug flow" and the catalyst storage is small, there is a temperature effect (endothermic or exothermic ) during the reaction process, it will inevitably cause a large temperature difference, which will affect the control of the reaction temperature and increase the by-product

[0005] Obviously another shortcoming of the current technology is that the reaction is controlled by the riser outlet temperature, and the amount of catalyst participating in the reaction is determined by the riser outlet temperature, which cannot be adjusted, and the reaction agent-oil ratio cannot be adjusted either.

[0006] Another disadvantage of the current technology is that the catalyst storage in the riser and the catalyst-oil ratio in each reaction zone are basically the same and cannot be adjusted.

Images