REDUCTION OF HINDERED DIBENZOTHIOPHENES IN FCC PRODUCTS VIA TRANSALKYLATON OF RECYCLED LONG-CHAIN ALKYLATED DIBENZOTHIOPHENES

摘要

The level of sterically hindered alkylated dibenzothiophenes in the distillate product fraction from an FCC process is reduced by fractionating the cracked hydrocarbon products of the process to form a cracked naphtha fraction and a light cycle oil fraction that contains naphthalenes and alkylated dibenzothiophenes. A portion of the light cycle oil fraction that primarily contains alkylated dibenzothiophenes, typically the fraction boiling in the range from about 500 to about 75O°F (260 to 400°C), is recycled to transalkylate the alkylated dibenzothiophenes in the recycled light cycle oil fraction.