Refined oil yield of the first vacuum side stream has reached 99.3% and yield of petroleum acids reached 0.62%. Acid number is 157mg KOH/g. Complex solvent can be recovered for reuse and the recovery rate is 98.9%.

• 经复合溶剂抽提 ；可脱除减一线油中80%25以上的石油酸 ；减一线精制油收率达 99.；3%25；石油酸收率达 0