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Preparation of biodiesel from cottonseed oil catalyzed by heteropoly acid ionic liquid
  
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KeyWord:heteropoly acid ionic liquid  cottonseed oil  biodiesel  transesterification
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AO Hongwei, WANG Shubo，FENG Shubo  
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Abstract:
      Five kinds of heteropoly acid ionic liquids \[TEA-PS\]XH3-XPW12O40(X=1,1.5,2,2.5,3) were synthesized, and the preparation of biodiesel by transesterification of cottonseed oil catalyzed by these heteropoly acid ionic liquids were studied, in which \[TEA-PS\]1.5H1.5PW12O40 showed the highest catalytic activity. Using \[TEA-PS\]1.5H1.5PW12O40 as catalyst, the effects of molar ratio of methanol to cottonseed oil, catalyst dosage, reaction temperature and reaction time on the transesterification of methanol and cottonseed oil were investigated. The results showed that under the conditions of molar ratio of methanol to cottonseed oil 12∶?1, catalyst dosage 5% (based on the mass of cottonseed oil), reaction temperature 80?℃ and reaction time 6 h, the yield of biodiesel was the highest, reaching 95.3%. At the same time, the yield of biodiesel was still above 92% after \[TEA-PS\]1.5H1.5PW12O40 was used for six times.
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