Catalytic conversion reactor and device and method for preparing propylene through catalytic cracking of heavy oil

Abstract

The invention relates to a catalytic conversion reactor and a method for preparing propylene by catalytic cracking of heavy oil. The reactor comprises a first reaction zone, a second reaction zone and a gas-solid separation zone which sequentially communicate with each other from bottom to top, and a steam stripping zone which is positioned below the second reaction zone and communicates with the second reaction zone, wherein the inner diameters of the second reaction zone and the gas-solid separation zone are greater than the inner diameter of the first reaction zone; the bottom of the gas-solid separation zone communicates with the steam stripping zone through a catalyst collecting pipe; gas-solid separation equipment is arranged in the gas-solid separation zone, an oil-gas outlet is formed in the top of the gas-solid separation zone, and a catalyst collection zone is arranged at the lower part of the gas-solid separation zone; and feed oil enters the first reaction zone to carry out low-severity reaction, high-severity catalytic cracking is carried out in the second reaction zone to generate propylene, reacted oil gas is subjected to gas-solid separation, and after gas-solid separation, a spent catalyst is subjected to steam stripping and regeneration and then returns to the reactor to be recycled. By adopting the method and the system for catalytic cracking, coke and dry gas yield is low, propylene yield is high, and energy consumption is low.

Description

technical field [0001] The invention relates to the petroleum refining field of heavy oil processing, in particular to a catalytic conversion reactor, a reaction device and an application method thereof. Background technique [0002] Propylene is a widely used basic organic chemical raw material, mainly used in the production of polypropylene, cumene, acrylonitrile, acrylic acid, etc. At present, propylene mainly comes from ethylene cracking units in petrochemical plants, catalytic cracking units in oil refineries, propane dehydrogenation, methanol to olefins and other processes. Naphtha steam cracking contributes the largest amount of propylene, followed by catalytic cracking of heavy oil, and propane dehydrogenation is an emerging industry that is limited by raw materials. At present, domestic propylene production is difficult to meet market demand and needs to be imported. In addition, with the development of electric vehicles, the growth of the market's pursuit of moto...

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a catalytic conversion reactor and a method for producing propylene by catalytic conversion of heavy oil, in order to solve the problem that the catalyst density of the bed layer decreases due to the increase in the volume of reactants The impact of the reaction, the gas residence time at the end of the reaction caused the secondary conversion of propylene, in order to achieve the purpose of improving the yield of propylene and the utilization efficiency of water vapor, and reduce the operating cost of the device

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