Abstract: In view of the problems such as large output of heavy aromatics diesel, high ratio of fuel to gasoline, low proportion of vehicle diesel and low cetane index, LTAG process combining hydrofining and catalytic cracking was used to convert heavy aromatics diesel into gasoline. RLG technology was used to convert aromatics in diesel distillate into high-octane gasoline components, which further improved the conversion rate of diesel and the quality of gasoline products. RLG diesel oil is smelted in the second riser reactor of RTC unit, and heavy aromatics diesel oil is deeply transformed into light aromatics, and the industry chain of light aromatics is expanded. The results show that the ratio of fuel to gasoline decreases from 1.18 to 0.95 after the transformation of LTAG. After the RLG unit is put into operation, the ratio of fuel to gasoline is further reduced to 0.74. After the RLG diesel is reheated in the second riser reactor of RTC, the fuel to gas ratio is reduced to 0.42. The results of economic benefit calculation show that the application of “RTC+RLG+AromaticsExtraction” combination technologyreduces the production of heavy aromatics diesel oil, increases the production of gasoline, aromatics, LPG and other high-value products, and increases the economic benefit of about 58.2241 million yuan per month.

Key words: RLG, RTC, heavy aromatic hydrocarbons, diesel to gasoline ratio