Catalytic cracking method for producing low-carbon olefins and light aromatic hydrocarbons

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 phosphorus-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 for catalytic conversion of hydrocarbon oil in the absence of hydrogen, and more particularly to a catalytic cracking method for producing light olefins and light aromatics. Background technique [0002] Low-carbon olefins represented by ethylene and propylene are the most basic raw materials in the chemical industry. Natural gas or light petroleum fractions are mostly used as raw materials at home and abroad, and low-carbon olefins are produced by steam cracking technology in ethylene complexes. In addition to the production of ethylene, about 70% of propylene, 90% of butadiene, and 30% of aromatics come from steam cracking by-products. Although the steam cracking technology has been developed for decades and the technology has been continuously improved, it still has high energy consumption, high production cost, and CO 2 Due to technical limitations such as large emissions and difficult adjustment of produc...

AI Technical Summary

Problems solved by technology

[0006] In summary, the existing technologies all take low-carbon olefins as the main target yield and co-produce light aromatics, so the increase in the yield of light aromatics is limited. It is necessary to develop a catalytic cracking method with higher yields of low-carbon olefins and light aromatics on the basis of current technology and catalytic materials

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