Patent ID: 8597500

Claim:
A process for converting inferior feedstock to high quality fuel oil, characterized in that the process comprises the steps as follow: (1) a preheated inferior feedstock is introduced into a first reactor zone in a catalytic conversion reactor and is subjected to catalytically cracking reactions by contacting with a catalytic conversion catalyst; the produced vapors and used catalyst, which are optionally mixed with light feedstocks and/or quench mediums, are introduced into a second reactor zone in the catalytic conversion reactor for further cracking, hydrogen transferring and isomerizing reactions; the resultant reaction products are separated from the spent catalyst by gas-solid separation, and then the reaction products are introduced into a separation system to obtain dry gas, LPG, gasoline, diesel and fluid catalytic cracking gas oil (FGO); optionally, the spent catalyst is stripped by steam, and then fed into a regenerator to be regenerated by burning off the coke, and then the heated regenerated catalyst is recycled to the reactor; wherein the reaction conditions in said first and second reactor zones reaction are sufficient to achieve a yield of FGO between 12% and 60% by weight of the feedstock; (2) said FGO is introduced into a hydrotreating unit and/or an aromatics extraction unit to obtain hydrotreated FGO and/or a raffinate of FGO; (3) said hydrotreated FGO and/or the raffinate of FGO are recycled to the first reactor zone in the catalytic conversion reactor and/or other FCC units for further reactions to obtain the target product high quality fuel oil, wherein the cutting temperature of said FGO is not less than 250° C., and the hydrogen content of FGO is not less than 10.5% by weight.