A catalytic cracking method for producing light olefins and light aromatics

Abstract

The invention relates to a catalytic cracking method for producing low-carbon olefins and light aromatic hydrocarbons. According to the catalytic cracking method, a heavy raw material and a first catalytic cracking catalyst are subjected to a contact reaction in a first reactor; a lightweight raw material rich in saturated hydrocarbons, a lightweight raw material rich in olefins and a second catalytic cracking catalyst are subjected to a contact reaction in a second reactor and a third reactor; all the reaction oil-gas and the spent catalysts are subjected to gas-solid separation; the reactionoil-gas is further separated to obtain a product containing light-carbon olefins and light aromatic hydrocarbons; and the spent catalysts are subjected to steam stripping, the steam stripped catalysts enter a catalyst regenerator, charring regeneration is performed, and the regenerated catalyst returns to the reactor so as to be recycled, wherein the catalytic cracking catalyst comprises, by weight, 15-65% of natural minerals, 10-60% of an oxide, and 25-75% of a Y-type molecular sieve and a loaded metal-containing IMF structure molecular sieve. With the method of the present invention, the yield of low-carbon olefins is high, and the yield of light aromatic hydrocarbons is high.

Description

Technical field

[0001] The present invention relates to a method of catalytic conversion of hydrocarbon oil in the event that there is no hydrogen, and more particularly to a catalytic cracking method for producing low carbon olefins and light aromatics. Background technique

[0002] Low carbon olefins represented by ethylene, propylene are the most basic raw materials of the chemical industry, and more natural gas or light petroleum fractions are raw materials at home and abroad, and the vapor cracking process is produced using a vapor hydrocarbon in the vinyl hydrocarbon. In addition to producing ethylene, about 70% propylene, 90% butadiene, 30% of the aromatic hydrocarbons are from steam cracking byproducts. Although the steam cracking technology has been continuously improved by decades, there is still high energy consumption, high production cost, CO 2 Large emissions and product structures are not easy to adjust and other technologies, traditional steam cleavage production ...

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