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| Optimization of L-glutamic acid ionic liquid catalyzed preparation of methyl oleate by response surface methodology |
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| DOI： |
| KeyWord:L-glutamate ionic liquid methyl oleate esterification reaction biodiesel response surface methodology |
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| Author Name | Affiliation | | ZHENG Li, WANG Wenwei, WANG Changmei, YIN Fang, YANG Bin, WU Kai, LIANG Chengyue, LIU Jing, YANG Hong, ZHANG Wudi | School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China |
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| Abstract: |
| In order to develop environmentally friendly and efficient catalysts to catalyze the esterification of oleic acid for the preparation of biodiesel, three ionic liquids were synthesized from L-glutamic acid and different inorganic acids (sulfuric acid, nitric acid and phosphoric acid), and the esterification rates of these three ionic liquids for the catalytic esterification reaction of oleic acid to prepare methyl oleate were investigated, and one ionic liquid with better catalytic efficiency was selected and characterized by Fourier infrared spectroscopy, and the process parameters of the catalytic oleic acid esterification reaction were further optimized by response surface methodology. The results showed that the catalytic efficiency of [L-Glu]HSO4 was the highest among the three ionic liquids, and the best reaction conditions for the catalytic esterification of oleic acid by [L-Glu]HSO4 were as follows: ionic liquid dosage 15%, molar ratio of alcohol to acid 11∶1, reaction temperature 70℃, and reaction time 12 h. The esterification rate was 97.02% under the best conditions. Therefore, the synthesized [L-Glu]HSO4 can efficiently catalyze the esterification of oleic acid to prepare biodiesel. |
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