System and process for producing high quality gasoline by catalytic hydrocarbon recombination

A system for preparing gasoline, comprising:

• a fractionator;
• a medium petrol extractor;
• a heavy petrol extractor;
• a medium petrol raffinate oil hydrogenation unit;
• and
• a medium petrol aromatic hydrocarbon hydrogenation unit;
• wherein a top part outlet of the fractionator is equipped with a light petrol pipeline for discharging light petrol, a bottom part outlet of the fractionator is equipped with a heavy petrol pipeline for discharging heavy petrol, a middle part outlet of the fractionator is equipped with a medium petrol pipeline for discharging medium petrol, the medium petrol pipeline is connected with an inlet of the medium petrol extractor for transporting the medium petrol to the medium petrol extractor, the heavy petrol pipeline is connected with an inlet of the heavy petrol extractor for transporting the heavy petrol to the heavy petrol extractor,
• a top part outlet of the medium petrol extractor is connected with an inlet of the medium petrol raffinate oil hydrogenation unit through a pipeline for transporting a first raffinate oil from the medium petrol extractor to the medium petrol raffinate oil hydrogenation unit, a bottom part outlet of the medium petrol extractor is connected with an inlet of the medium petrol aromatic hydrocarbon hydrogenation unit through a pipeline for transporting a first aromatic hydrocarbon from the medium petrol extractor to the medium petrol aromatic hydrocarbon hydrogenation unit,
• an outlet of the medium petrol aromatic hydrocarbon hydrogenation unit is connected with the light petrol pipeline in the top part outlet of the fractionator through a pipeline for blending hydrogenated first aromatic hydrocarbon from the medium petrol aromatic hydrocarbon hydrogenation unit with the light petrol from fractionator,
• a bottom part outlet of the heavy petrol extractor is connected with the inlet of the medium petrol aromatic hydrocarbon hydrogenation unit through a pipeline for transporting a second aromatic hydrocarbon from the heavy petrol extractor to the medium petrol aromatic hydrocarbon hydrogenation unit, a top part outlet of the heavy petrol extractor is connected with the inlet of the medium petrol raffinate oil hydrogenation unit through a pipeline for transporting a second raffinate oil from the heavy petrol extractor to the medium petrol raffinate oil hydrogenation unit.