Abstract
The naphthenic acid in diesel oil was removed by sodium carbonate as deacidification agent under strengthening of supersonic. The influence of affect factors about treating conditions on the acid removal of diesel oil was investigated, such as ultrasonic frequency, volume ratio of sodium carbonate solution to oil (VRSO), ultrasonic work function, and ultrasonic strengthening time. Orthogonal tests were done to confirm the optimum process condition. The results showed that the optimum condition was that ultrasonic frequency was 28 KHz, VRSO was 0.30, ultrasonic work function was 350 W, and ultrasonic strengthening time was 6 min. Under this optimum condition, acidity of diesel oil was reduced to 4.88 mgKOH/100 mL from 135.52 mgKOH/100 mL, and deacidification rate of naphthenic acid reached 96.4%.
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