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- Title
Lewis Acidic Ionic Liquid [Bmim]FeCl as a High Efficient Catalyst for Methanolysis of Poly (lactic acid).
- Authors
Liu, Huiqing; Zhao, Ruiyang; Song, Xiuyan; Liu, Fusheng; Yu, Shitao; Liu, Shiwei; Ge, Xiaoping
- Abstract
Methanolysis of poly (lactic acid) (PLA) was studied using Lewis acidic ionic liquid [Bmim]FeCl as a catalyst and the qualitative analysis indicated that the main product was methyl lactate. Compared with ionic liquid [Bmim]Cl, FeCl and other traditional catalysts, the Lewis acidic ionic liquid showed much better catalytic activity in the methanolysis of PLA. Significantly, the conversion of PLA and the yield of methyl lactate were 99.3 and 94.6% respectively with low dosage of catalyst (the molar ratio of [Bmim]FeCl to LA unit is 0.0025:1). The lewis acidic ionic liquid [Bmim]FeCl could be recycled up to 6 times and FT-IR results showed that the spectrum of the reused catalyst was similar to that of the fresh one. Moreover, a possible mechanism of the methanolysis of PLA catalyzed by [Bmim]FeCl was proposed. The kinetics of PLA methanolysis was also investigated under the optimum conditions and the results indicated that it was a first-order kinetic reaction with activation energy of 21.28 kJ mol. Graphical Abstract: The methanolysis of poly (lactic acid) (PLA) was studied using Lewis acidic ionic liquid [Bmim]FeCl (x>1) as catalyst. The effects of reaction temperature, reaction time, ionic liquid dosage and methanol dosage on methanolysis results were examined. The reusability of ionic liquid in the methanolysis of PLA was investigated, and the results showed that it could be recycled up to 6 times with no apparent decrease in the conversion of PLA and yield of methyl lactate. The reaction mechanism and kinetics of PLA methanolysis catalyzed by [Bmim]FeCl were also investigated. Moreover, a possible catalysis mechanism of the methanolysis of PLA was proposed.
- Subjects
LEWIS acids; IONIC liquids; METHANOLYSIS; POLYLACTIC acid; FERRIC chloride; CATALYTIC activity
- Publication
Catalysis Letters, 2017, Vol 147, Issue 9, p2298
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-017-2138-x