Method and apparatus for desulfurization and separation of catalytically cracked light product

A method for the desulfurization and separation of a catalytic cracking light product, comprising the steps of:

• 1) Contacting a crude gasoline from a catalytic cracking fractionator with a desulfurization adsorbent in a first fluidized bed desulfurization reactor in the presence of hydrogen for desulfurization to generate a first reaction mixture comprising a desulfurized crude gasoline and the desulfurization adsorbent;
• separating the desulfurization adsorbent in the first fluidized bed desulfurization reactor into a first desulfurization adsorbent stream and a second desulfurization adsorbent stream;
• sending the first desulfurization adsorbent stream from the first fluidized bed desulfurization reactor to a second fluidized bed desulfurization reactor;
• contacting a rich gas from the catalytic cracking fractionator with the first desulfurization adsorbent stream in the second fluidized bed desulfurization reactor in the presence of hydrogen for desulfurization to generate a second reaction mixture comprising a desulfurized rich gas and a spent desulfurization adsorbent;
• sending the spent desulfurization adsorbent from the second fluidized bed desulfurization reactor directly to the first fluidized bed desulfurization reactor;
• sending the second desulfurization adsorbent stream from the first fluidized bed desulfurization reactor to an adsorbent regenerator for regeneration without entering the second fluidized desulfurization reactor, wherein the regeneration is carried out by calcining in the presence of an oxygen-containing gas, and recycling the regenerated desulfurization adsorbent to the first fluidized bed desulfurization reactor after reduction;
• and
• 2) Introducing the desulfurized rich gas and the desulfurized crude gasoline obtained in the step 1) to a catalytic cracking absorption stabilization system at two separate locations, respectively, and outputting a desulfurized dry gas, a desulfurized liquefied gas, and a desulfurized stabilized gasoline from the catalytic cracking absorption stabilization system,
• wherein the rich gas comprises C1-C4 hydrocarbons and the crude gasoline comprises C4-C12 hydrocarbons.