Study on Extraction of Lysine Using Saponified HA/Kerosene Microemulsion System

The mechanism and technique of extracting lysine were studied in HA/kerosene/NaOH microemulsion system.The effect factors on extracting lysine from aqueous phase,including the concentration of NaOH,the extraction time,the volume ratio of microemulsion to external aqueous phase,the pH value of the external phase,the recycle times of oil phase,were investigated.The results showed that the extraction rate of lysine reached 90.2% primarily when HA concentration in the oil phase was 1.0 mol·L-1,the concentration of NaOH was 1.25 mol·L-1,the volume ratio of microemulsion to external aqueous phase was 1∶4,the pH value of the external aqueous phase was 3.0,the extraction time was 10 min.The microemulsion system exhibited several advantages including good stability,low leakage and swelling,high efficiency of extraction,easy demulsification,and recoverable oil phase.