The group contribution method was applied to estimate the solubility parameter of(S)-2-chloropropanoic acid.According to the similarity rule of solubility parameter,the possible extraction agents for(S)-2-chloropropanoic acid were selected.The concentrations of(S)-2-chloropropionic acid in different extraction agents were analyzed by gas chromatography,and the apparent partition coefficient of each extraction agent was calculated.The results showed that ethyl acetate and dichloromethane were the best extrac...