Catalytic pyrolysis process for producing petroleum hydrocarbon of ethylene and propylene

Abstract

The invention discloses a catalytic pyrolysis process for producing petroleum hydrocarbon of ethylene and propylene which comprises, feeding preheated petroleum hydrocarbon raw material into lift tubes, contacting phosphor modified five-membered ring high silicon zeolite catalyst for reaction under the condition of catalytic thermal cracking, thus separating the reaction product and catalyst to be produced, then loading the reaction product into subsequent separation system for product separation, stripping and regenerating the catalyst, returning to reactor for circulation.

Description

technical field [0001] The invention relates to a petroleum hydrocarbon catalytic pyrolysis method for producing ethylene and propylene. Background technique [0002] The traditional method of producing ethylene from petroleum hydrocarbons is steam thermal cracking, and the suitable raw materials are light petroleum hydrocarbons such as ethane, propane, butane, natural gas, naphtha or light diesel oil. As crude oil becomes heavier, the production of light petroleum hydrocarbons is limited, so people turn their attention to the process of producing ethylene from heavy petroleum hydrocarbons. For example, the pyrolysis method of heavy petroleum hydrocarbons using inert solids such as quartz sand and coke as heat carriers, and the pyrolysis method of heavy petroleum hydrocarbons using alkali metal or alkaline earth metal oxide catalysts as heat carriers, etc. The reaction temperature of these methods all exceeds 800°C. [0003] In recent years, some patents have introduced th...

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Problems solved by technology

[0013] In summary, the prior art has not yet involved the use of five-membered ring silicalite catalysts containing phosphorus and transition metals to catalyze thermal cracking to produce low-carbon olefins such as ethylene and propylene.