Method for producing high octane rating low olefin gasoline

Abstract

The invention discloses a production method for high-octane low-olefin gasoline. The catalytic cracking catalyst is risen by a pre-lift medium and then is reacted with raw material in a reactor, product and spent catalyst obtained after the reaction are draw from the reactor to be separated, the reaction system comprises at least two reactors, the change range of the density of the catalyst in each reactor is between +-1 and 20 percent, the change range of gas velocity of a non-catalyst hollow tower is between +-1 and 18 percent, any reactor is imported with the semi-generated catalyst or a generated catalyst. With the method provided by the invention, the oil gas speed and the catalyst density in the reactor have small changes, the fluidized state is relatively steady, the mass transfer speed and the temperature are evenly distributed in the reactor, so the method provided by the invention has high heavy raw material catalytic cracking conversion rate, reduces the olefin content of the gasoline, and improves the octane value of the gasoline.

Description

technical field [0001] The present invention relates to a method for catalytic conversion of hydrocarbon oil in the absence of hydrogen, more specifically, a method for catalytic cracking of heavy feedstock to produce gasoline with high octane number and low olefins. Background technique [0002] In the process of fluidized catalytic cracking or fluidized catalytic cracking, the high-temperature regenerated catalyst contacts and reacts with raw oil. The main products are gasoline and diesel, and a part of liquefied gas, dry gas, oil slurry and coke are also produced. The coke is deposited on the spent catalyst and enters the regenerator together with the spent catalyst to be burnt to restore activity, and the regenerated catalyst whose activity has been restored enters the reactor for recycling. [0003] In recent years, environmental protection regulations have stricter requirements on the olefin content and aromatic content of gasoline; at the same time, the requirements o...

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Problems solved by technology

[0011] The above-mentioned prior art supplements part of the regenerated catalyst during the reaction process of the riser reactor in an effort to improve the catalyst cracking activity at the rear of the traditional riser reactor, but there are still large changes in the oil and gas velocity and catalyst density, and the fluidization state in the reactor is relatively large. Disadvantages of large changes, can not guarantee a relatively stable fluidized state, mass transfer rate and uniform temperature distribution

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