Catalytic conversion method for increasing yield of gasoline and improving octane number of gasoline

Abstract

The invention relates to a catalytic conversion method for increasing the yield of gasoline and improving the octane number of the gasoline. The method of the invention mainly solves the problem of low gasoline yield in a conventional catalytic cracking process. The catalytic conversion method provided by the invention comprises the following steps: allowing preheated light hydrocarbons and heavyhydrocarbons to be simultaneously and respectively sprayed out from an integrated spray nozzle into different reaction zones of a lift pipe reactor to contact and react with a catalyst from a regenerator, allowing reaction products and a carbon deposit catalyst to flow out from the lift pipe reactor and to enter a cyclone separation system for separation, allowing a separated catalyst to undergo steam stripping, then enter the regenerator for charring and then return to the bottom of the lift pipe reactor for cyclic use, and allowing the reaction products to undergo fractional distillation viafractionating towers so as to obtain corresponding products, wherein the integrated spray nozzle is a spray nozzle capable of simultaneously and respectively spraying the light hydrocarbons and the heavy hydrocarbons out from different spray heads; and the reaction zones are composed of a light hydrocarbon reaction zone I, a heavy hydrocarbon reaction zone and a light hydrocarbon reaction zone IIsuccessively arranged along the vertical direction of the reactor from bottom to top. The catalytic conversion method provided by the invention has the characteristics of capacity of increasing the yield of the gasoline and improving the octane number of the gasoline.

Description

technical field [0001] The invention relates to a method for catalytic conversion of hydrocarbons, more specifically, relates to a method for catalytic conversion of heavy diesel oil and low-quality heavy oil to increase gasoline production and increase gasoline octane number in the absence of hydrogen. Background technique [0002] Under the new economic normal, the consumption of China's major refined oil products is still on the rise. The rigid demand for gasoline is growing rapidly, while the growth rate of diesel demand is greatly reduced. Before 2020, the growth rate of gasoline demand in my country will be faster than that of diesel. The ratio of diesel oil has gradually declined, the refined oil market has changed, diesel stocks have increased sharply, and the problem of excess diesel has become prominent, which has affected the normal operation of refineries. It is urgent to reduce diesel stocks and increase gasoline production. Research on historical data at home an...

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Problems solved by technology

[0013] The measures taken to reduce the diesel-gasoline ratio in the above-mentioned industrial installations have reduced the output of heavy diesel oil and increased the output of gasoline to a certain extent, but they all adopt conventional means to mix heavy diesel oil with heavy catalytic feedstock and then enter the riser reactor for further processing. Reaction, because the cetane number of heavy diesel oil produced by atmospheric and vacuum devices is generally 50-70, most of which are large-molecular straight-chain alkanes, directly mixed with heavy catalytic raw materials, and then reacted with high-temperature regenerated catalysts The temperature is only 530-570°C. This reaction condition is not conducive to the cracking of large-molecular straight-chain alkanes into small-molecular hydrocarbons, which shows that the increase in gasoline yield is limited.

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