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Water washing technique in the alkaline- catalyzed production process of biodiesel
  
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KeyWord:biodiesel  refining  water washing  demulsification  
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Abstract:
      The water washing method,which using water removes the impurities in the ester layer,such as soaps,unreacted KOH catalyst and traces of glycerol,has been widely applied in the commercial production of biodiesel.However,this method in practical operation is difficult due to the emulsification of ester-water.Different demulsification methods,such as gravitational settling,stirring,heating,addition of demulsifiers and addition of electrolyte,were investigated and evaluated in detail.The results showed that whe...
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