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Optimization of degumming conditions of waste cooking oil
  
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KeyWord:waste cooking oil  degumming  mixture acids-alkaline-water joint method
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WU Zhenpeng  
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Abstract:
      The waste cooking oil was degummed by mixture acids-alkaline-water joint method, and the degumming conditions were determined and optimized. The optimal degumming conditions were obtained as follows: mixture acid solution 0.3% citric acid and 0.4% phosphoric acid, reaction time 30 min and reaction temperature 85?℃, controlling solution pH 5-6 by 10% NaOH solution at 45?℃, alkaline reaction time 30 min,water dosage 3%(based on oil mass) and stirring 30 min at 75?℃, resting time 2 h, centrifugation speed 2 000 r/min for 5 min. The five waste cooking oils were degummed under the optimal conditions, and the degumming rate was as high as 97.37%.
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