In order to improve the removal rate of acid from heavy oil with the solvent method

in this study

ultrasonic assisted method was used to investigate the deacidification of heavy oil using 95% ethanol as solvent. Simultaneously

uniform design method was applied to optimize the deacidification process according to four important condition parameters （ultrasonic power

deacidification time

deacidification temperature and solvent-to-oil ratio）. The optimum deacidification process conditions were determined as follow： ultrasonic power is 400 W

deacidification time is 7 min

deacidification temperature is 70℃ and the solvent-to-oil ratio is 0. 3 （mL · g-1 ）. under that condition

the acid removal rate from heavy oil was up to 70.35%. The ultrasound-assisted solvent method exhibits a lot of advantages in heavy oil deacidification process

such as

short deacidification time

low deacidification temperature

high deacidification rate and simple post-processing

which possesses potential prospect for industrialization.