Method for producing propylene, ethene by using catalytic cracking olefin through fluid bed

Abstract

This invention relates to a method for manufacturing propylene and ethylene by alkenes catalytic cracking in fluid bed reactor. The method comprises contacting alkenes with catalyst in a fluid bed reactor, and catalytically cracking to obtain propylene and ethylene. The catalyst uses ZSM molecular sieve 20-80 wt.% as the carrier, and rare earth oxides 0.01-6 wt.%, phosphorus oxides 0.01-6 wt.%, and binder 10-70 wt.% as the active components. The method solves the problems of quick coking inactivation and poor hydrothermal stability of the catalyst, low yield of propylene, etc., and can be used in propylene and ethylene manufacture by alkenes catalytic cracking.

Description

technical field

[0001] The invention relates to a method for producing propylene and ethylene by fluidized bed olefin catalytic cracking, in particular to a method for producing propylene and ethylene by fluidized bed catalytic cracking of carbon four and above olefins. Background technique

[0002] The demand for basic chemical raw materials such as propylene and ethylene continues to grow, while crude oil raw materials are deteriorating day by day, which has brought about increasingly prominent contradictions in the production of propylene and ethylene. On the other hand, mixed carbon four and above olefins and alkanes are by-products of ethylene plants, refinery FCC units, methanol to olefins, and gasoline units, and usually can only be used as low value-added products such as liquefied gas fuels. It is of great significance to use these olefins and alkanes raw materials for further deep processing to produce high value-added products propylene...