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 Posted: Fri 13:25, 07 Jan 2011 Post subject: ugg boots Acid methyl ester using ionic liquids sy |
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Acid ionic liquid synthetic reaction of methyl
([MPy] HS04): (oleic acid) -0.019, the conversion rate of oleic acid significantly increased, but continue to increase the amount of catalyst (n ([MPy] HSO4): (oleic acid) = O.o38) when the conversion rate of oleic acid compared to n ([MPy] HSO4): (oleic acid) = O. 019, the increase only slightly, increasing the amount of catalyst that can help improve the reaction rate, but the amount increases to a certain extent, on the reaction rate was less affected. Economic factors into account,[link widoczny dla zalogowanych], choose n ([MPy] HSO4): n (acid) = O. 019 is the best catalyst. 2.3 reactants ratio on esterification Figure 3 is the optimum amount of catalyst temperature and the best conditions, by changing the molar ratio of raw materials, after 5h of reaction conditions the conversion of oleic acid. It can be seen from Figure 3, with the increase of molar ratio of oleic acid conversion rate is also increasing, but the increase gradually decreased. This is due to the esterification reaction is reversible,[link widoczny dla zalogowanych], the amount of raw materials will help promote the reaction of methanol to the positive direction, but when the molar ratio increases to a certain extent on the reaction rate to almost no impact. Therefore, the mole ratio of less than 2, the molar ratio of greater impact on the reaction rate,[link widoczny dla zalogowanych], conversion rate is 1 molar ratio of 69.56% when the molar ratio of 2 increased to 88.21% when and the molar ratio continues to increase to 3, the conversion rate increased to 92.99%, and then increases when the molar ratio of double the conversion rate when only a 2.2% increase. Therefore, the cost of raw materials, methanol, methanol esterification of the separation rate of energy consumption and other aspects into account, select the molar ratio of 2 as the best material ratio. Figure 2 under different acid catalyst conversion rate over time in Fig. 2Effectofratiosofcat/oleicacidonthereaction1.00.9 Summer O. 8 × O7O605012345n (M / OAY (mol · tool. 1 Figure 3, after 5h reaction under different molar ratio of oleic acid conversion FigI3Effectofrmiosofmethanol/oleicacidonthereaction3 Conclusion oil methyl ester confirmed the optimum reaction conditions were: reaction temperature is 150 ℃, catalyst was n ([MPy] HSO4): (oleic acid) = 0.019, molar ratio of 2, the reaction time was 5h. in the reaction conditions,[link widoczny dla zalogowanych], the conversion of oleic acid can reach 88 .2 l%. This method is environment-friendly reaction, the catalyst with less, high activity and less pollution,[link widoczny dla zalogowanych], with industrial development prospects of further optimize the catalyst structure is continuing.
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