Catalytic conversion method for producing diesel and propylene in high yield

Abstract

The invention discloses a catalytic conversion method for producing diesel and propylene in high yield. Raw oil is contacted with a catalyst in coarse particle size distribution in a reactor for reaction, the reaction temperature, weight hourly space velocity, and the weight ratio of the catalyst to the raw oil sufficiently ensures that a reaction product comprising catalytic wax oil which is 12 to 60 weight percent of the raw oil is obtained in the reaction, and the catalytic wax oil enters a hydrotreater for further treatment. The catalytic cracking, hydrotreating and a process of producing diesel in high yield are integrated, hydrocarbons such as alkane, alkyl side chain and the like in the raw material are selectively subjected to cracking and isomerization catalysis, aromatic hydrocarbon in the raw material is reduced to the greatest extent to enter diesel fraction, other components in the product are prevented from generating aromatic hydrocarbon through aromatization and other reaction so as not to remain the aromatic hydrocarbon in the diesel fraction, the raw material is converted into high cetane number diesel and propylene, the yield of dry gas and coke is greatly reduced, and the catalyst breaking trend and catalyst consumption are reduced.

Description

technical field [0001] The invention belongs to the catalytic conversion method of hydrocarbon oil in the absence of hydrogen, more specifically, it is a catalytic conversion method for converting heavy feedstock into high cetane number diesel oil and propylene. Background technique [0002] At present, the global demand for high-quality gasoline is increasing day by day, and the technology for producing high-quality gasoline is developing rapidly, while the technology for producing high-cetane diesel is developing relatively slowly. Although the demand for gasoline and diesel varies from region to region, overall, the growth rate of global demand for diesel will gradually exceed the growth rate of demand for gasoline. The cetane number of diesel produced by traditional catalytic cracking process is relatively low, so it is often used as a blending component of diesel. In order to meet the demand of high-quality diesel oil, it is necessary to upgrade the catalytic light die...

AI Technical Summary

Problems solved by technology

[0004] CN1900226A discloses a catalytic cracking co-catalyst and its preparation method for prolific diesel oil production. Adding a certain amount of the co-catalyst can increase the diesel yield of the FCC catalytic unit and improve Product distribution, but the method does not mention improvement in diesel properties

It has been found through research that although these fine particle catalysts have high cracking capacity, their selectivity to dry gas and coke is poor. Optimizing the sieve composition of the catalyst can improve the selectivity of dry gas and coke

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