Abstract: In order to solve some technologic and economic shortage in the process of alkali washing and electricity straight-ru diesel and decompress distillate oi,l a new technology of remo ving naphthenic acid from distillate oil has been adopted, an the best condition of the technology and industrial applicatio
have been investigated. Comparing with the process of alka washing and electricity removing naphthenic acid, it ismore advantageous in many sides: it fits for different acidity distillatoi,l reduces the amountof alkali67% -75%, no emulsificatio exists, mix intension has no infection to refined oil acidity, th
losing ofdistillate oildeclines 50% -60%, deacidification-sovent can be reused after regeneration, nowaste alkaliwater exists and reduces the pollution of environment. Under the be conditions, the refined diesel′s acidity is zero and can meet thtransformer oil′s acid number ( acid number 0. 1 mg KOH/g ).The quality of reclaimed petroleum acids can meethe 65#petroleum acids quality standard (SH/T0530-92).

Key words: distillate oi, l deacidification-solvent, petroleum acids, refining, laboratory evaluation, industrial application