A deep desulfurization process for FCC light gasoline has been investigated. The process is comprised of liquid-liquid extraction with acetonitrile, and photooxidation with ultraviolet light from a high-pressure mercury lamp. After the extraction the sulfurcontaining compounds transfer from the oil to the solvent and then the solvent containing these sulfur compounds was photoirradiated with ultraviolet light from a high pressure mercury lamp 300 W and with 200-300 nm, using strengthen electronic stirrer during the irradiation .The oil from the solvent was recovered with water. An azeotropic mixture (containing 86% acetonitrile and 14% water) was recovered successfully with one distillation column, and can reuse. The total sulfur content in this gasoline decreased from 309 to 68 ppm following 8 h of photo-irradiation .The total yield of the oil vary between 90-96%. The main sulfur compounds of this gasoline are alkyl substituted thiophenes.

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