Catalytic conversion method for diesel oil and propylene with high yield

Abstract

The invention discloses a catalytic conversion method for diesel oil and propylene with high yield. Raw material oil is contacted with a catalyst with coarse particle size distribution in a reactor to react; reaction temperature, weight hourly space velocity and weight ratio of the catalyst to the raw material oil are sufficient so that a reaction product containing catalytic wax oil which is 12 to 60 weight percent of the raw material oil; and the catalytic wax oil is fed into a hydro-cracking device for further treatment. Catalytic cracking, hydro-cracking and high-yield diesel oil processes are organically combined, hydrocarbons such as alkane, alkyl side chain and the like in the catalytic raw materials are selectively cracked and isomerized, meanwhile, aromatic hydrocarbons in the raw materials are furthest reduced to enter the diesel oil fraction, and aromatic hydrocarbons generated by reaction of other components in the product such as aromatization and the like are prevented from being left in the diesel oil fraction; and when the raw materials are transformed into the diesel oil with high cetane number and the propylene, the yields of dry gas and coke are greatly reduced, and catalyst crushing tendency 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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