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Ultrasound-microwave pretreatment of oily waste clay
  
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KeyWord:flaxseed oil  waste clay  ultrasound-microwave pretreatment  response surface methodology  recovery rate
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WANG Miao, LI Yanjie, SUN Tingting  
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Abstract:
      Ultrasound-microwave-assisted extraction of flaxseed oil from oily waste clay was studied. On the basis of single factor experiment, with ultrasonic power, liquid-solid ratio and pretreatment temperature as factors, and the oil recovery rate as index, ultrasound-microwave pretreatment conditions were optimized by response surface methodology. The results indicated that the optimal pretreatment conditions were obtained as follows: ultrasonic power 420 W, microwave power 450 W, liquid-solid ratio 3∶?1, pretreatment time 9 min and pretreatment temperature 72?℃. Under these conditions , the oil recovery rate was 89.8%. The color of the recovered flaxseed oil was lighter and the quality was good, which reached the standard of crude flaxseed oil.
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