Catalytic cracking method

Abstract

This invention describes a process for catalytic pyrolysis, comprising the steps of: (1) introducing the reactants into a pre-heater, wherein the reactants are vaporized into gases; (2) introducing the mixed solutions containing ultrafine or nanoscale catalyst into the pipeline between the pre-heater and the reactor, or directly into the reactor, wherein the said ultrafine or nanoscale catalyst is uniformly mixed with the process (1) wherein said gaseous reactants; (3) pyrolysis of the said uniform mixture in the reactor. The average diameter of the said ultrafine or nanoscale catalyst is in the range of 1nm-100mum. This invention resolves such problems existing in the present fixed-bed reaction process as easy carbonization of the catalyst, a short service periodic and frequent need for recovery. The process of this invention is easy to operate, and suitable for a wide variety of catalytic pyrolysis reactions. Compared with the present pyrolytic process, the process of this invention can increase the weight yield rate of ethylene+propylene+butadiene by at least 5%, while the equipment remains the same with only a feeding pipeline added.

Description

technical field [0001] The present invention relates to a method for catalytic cracking, more specifically, relates to a method for preparing low carbon number olefins by catalytic cracking of petroleum hydrocarbons. Background technique [0002] There are two main types of catalysts used in petrochemical production: heterogeneous catalysts and homogeneous catalysts. Because homogeneous catalysts are difficult to separate from the product, people have explored the method of loading homogeneous catalysts on the carrier, that is, homogeneous catalytic heterogeneity. After years of research and exploration, industrialization has not been realized so far, mainly because the problem of active component loss is difficult to solve. . It is because of the above-mentioned disadvantages of homogeneous catalysts that most industrial catalysts are heterogeneous catalysts. The following problems generally exist in the use of heterogeneous catalysts: 1. The amount of catalyst is large, ...

AI Technical Summary

Problems solved by technology

The following problems generally exist in the use of heterogeneous catalysts: 1. The amount of catalyst is large, the utilization rate is low, and the service life is short; 2. It is easy to form carbon and requires frequent regeneration; 3. There are still many active components in the deactivated catalyst that do not play a role Wait

[0007] Since the fixed-bed reaction process uses a heterogeneous catalyst, the main disadvantage is that the catalyst is easy to coke, the service life is short, and frequent regeneration is required; the main disadvantage of the fluidized-bed reaction process is that not only the investment is large, but also the product contains nitrogen and oxygen, resulting in a reaction with hydrogen. , methane, ethylene and other light components are difficult to separate

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