Abstract: A new method of removing thiol from RFCC naphtha by liquid-liquid extraction using aqua ammonia was introduced. Results showed that at ambient temperature and atmospheric pressure, using naphtha from RFCC unit of SINOPEC Jinan Company as feed and 26%～28% ammonia as solvent, under the conditions of a solutizer (B32) dosage of 10 µg/g (based on feed), a catalyst dosage of 15 µg/g (based on feed), an ammonia amount of 0.6% (based on feed mass fraction) and a separation time of 5 h, the doctor test of the treated gasoline was qualified, and without negative effect on its other properties. In this method, pre-alkali washing of feed was omitted, and the aqua ammonia could be recovered and reused, which significantly reduced the operation fee.

Key words: RFCC, gasoline, mercaptan sulfur, catalyst, aqua ammonia, sweetening