Method for producing propylene by using cracking olefin of carbon four and higher

Abstract

This invention relates to a method for manufacturing propylene by C4+ alkenes catalytic cracking. The method adopts a mixture containing ore or more C4+ alkenes as the raw material, and contacts the raw material with a crystalline aluminosilicate catalyst with SiO2 / Al2O3 mol ratio not lower than 10 in a two-stage catalyst bed layer to obtain an effluent containing propylene. The reactor comprises an inlet pipe, a gas-distributor, a first catalyst bed layer, an intermediate heat exchanger, a second catalyst bed layer and an outlet pipe. The method solves the problems of low propylene selectivity, low yield and short catalyst regeneration period, and can be used in propylene industrial manufacture by C4+ alkenes catalytic cracking.

Description

Technical field

[0001] The invention relates to a method for preparing propylene by cracking C4 and above olefins. More specifically, it relates to a method for preparing propylene by adopting an adiabatic multi-stage composite fixed-bed reactor through the catalytic cracking of C4 and above olefins. Background technique

[0002] At present, there are a considerable amount of C4 and above olefin raw materials worldwide. Affected by factors such as changes in the chemical product market and transportation costs, in-situ deep processing of these raw materials is a better way to use them. The conversion of C4 and above olefins to propylene is a promising process. On the one hand, the process can use relatively low excess value-added C4 and above olefin raw materials, on the other hand, it can obtain a wide range of propylene products, and the by-product ethylene makes the process more attractive.

[0003] The main advantage of the fixed bed reactor is that the fluid flow in the bed ...

Images