Catalytic cracking method having low oiling agent contact temperature difference, and device thereof

Abstract

The invention relates to a catalytic cracking method having a low oiling agent contact temperature difference, and a device thereof. A routine heavy oil catalytic cracking reactor and a gasoline modification reactor are coupled, and commonly have a regenerator, parts of a catalyst to be regenerated from a gasoline settlement device are guided back to the bottom of the gasoline modification reactor, parts of the catalyst to be regenerated are guided back to the bottom of the heavy oil cracking reactor, and the residual parts of the catalyst to be regenerated are guided back to and regenerated in the regenerator; a catalyst from the regenerator is cooled to 500-690DEG C, is introduced into the bottom of the gasoline modification reactor and the heavy oil cracking reactor, and the above regenerated catalyst and the catalyst to be regenerated are input to the reactors under the action of a fluidized gas; and recycle crude gasoline, catalytic heavy oil and recycle oil are injected into the gasoline modification reactor and the bottom of the heavy oil cracking reactor, and contact and react with the mixed catalyst. The method has the advantages of gasoline olefin content reduction, oiling agent contact temperature difference reduction, and device energy utilization rate improvement.

Description

technical field [0001] The invention relates to a catalytic cracking method and device for reducing the olefin content of gasoline, reducing the contact temperature difference of oil agents and improving the energy utilization rate of the device. Background technique [0002] The high content of olefins in gasoline for vehicles brings serious environmental problems, and the NO in automobile exhaust X , HC content increases substantially, the ozone content of atmospheric troposphere increases, add other poisonous emission, even form photochemical smog in the city. The olefin content of motor gasoline comes from catalytic gasoline, so reducing the olefin content of catalytic gasoline is one of the technological goals pursued by people. According to the actual situation in our country, it is unrealistic to carry out hydrogenation and other reprocessing processes for FCC gasoline, and the processing cost will be further increased. Therefore, based on the catalytic cracking uni...

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Problems solved by technology

In the existing gasoline refining process, the liquid-phase gasoline fraction is in contact with the catalyst, resulting in an excessively high contact temperature difference of the oil agent, which should generate pentacoordinated carbocations, thereby generating a large amount of dry gas; (2) After reacting with gasoline (3) In the catalytic cracking process of heavy oil such as catalytic raw materials, there is also a generally large contact temperature difference of the oil agent, resulting in non-ideal conditions such as dry gas and coke. Increased product yield also makes energy utilization unreasonable

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