Hydrogenation modification method for coking gasoline and diesel distillates

Abstract

The invention discloses a hydrogenation modification method for coking gasoline and diesel distillates. A coking gasoline and diesel raw material is mixed with heated hydrogen and then introduced to pass through a low-temperature hydrorefining reactor and a hydrogenation modification reactor in sequence; a reaction effluent is separated and modified, and obtained liquid is distilled to obtain gas, gasoline, kerosene and diesel. In the method disclosed by the invention, a process flow of mixing hydrogen behind a furnace is adopted, the heating furnace is only used for heating the hydrogen, the mixed raw material does not pass through the heating furnace, and the temperature of the reactor is controlled based on the quantities of hot hydrogen and cold hydrogen. Compared with the prior art, the hydrogenation modification method disclosed by the invention has the advantage of saving equipment investment and being flexible in production scheme, can be used for flexible production by adjusting process conditions and production distribution according to the differences of raw material properties and product schemes; by implementation of hydrogen mixing behind the furnace, the coking raw material can be effectively prevented from being coked at a furnace tube; and by arrangement of a low-temperature protective agent reactor, olefin saturation is performed at lower temperature so as to reduce coking, meanwhile, coke powder is distributed at a protective agent bed as uniform as possible, so that the long-term operation of a hydrogenation device is ensured.

Description

technical field

[0001] The invention belongs to a method for refining hydrocarbon oil under the condition of the presence of hydrogen, more specifically, it belongs to a method for hydrogenation and upgrading of coking gasoline and diesel fractions. Background technique

[0002] At present, the demand for light and medium oil products, especially gasoline, in the domestic and foreign oil product markets will continue to rise, while the demand for heavy oil products will show a downward trend. At the same time, the properties of crude oil are deteriorating day by day on a global scale, and environmental regulations are becoming stricter. Therefore, how to realize the lightening of heavy oil at a more economical and reasonable price, and the refining technology that the obtained products can meet the increasingly stringent specifications of gasoline and diesel products has become one of the key technologies developed by domestic and foreign refining technology developers. [...

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