Effect of Ionic Liquid 1-Butyl-3-Methyl-Imidazolium Dihydrogen Phosphate Pretreatment on Pyrolysis of Lignin
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In order to improve the yield of liquid fraction and phenolics content during lignin pyrolysis, an effective method of lignin pyrolysis through the pretreatment of lignin by an acidic ionic liquid 1-butyl-3- methyl-imidazolium dihydrogen phosphate ([Bmim]H2PO4) at low temperature is investigated in this study. It is found that [Bmim]H2PO4 pretreatment increases the total yield of liquid products of lignin pyrolysis compared to that of original lignin. The [Bmim]H2PO4 pretreatment temperature significantly impacts the behaviors of the lignin pyrolysis. In the temperature range of 50 to 150°C, the yield of the overall liquid product obtained by pyrolysis of the sample pretreated at 50°C is the highest. After pretreatment, the [Bmim]H2PO4 can be efficiently recovered, but the structure and stability of the [Bmim]H2PO4 have been changed. The FTIR analysis shows that the ionic liquid [Bmim]H2PO4 pretreatment can break hydrogen bonds, ether linkages and ester bonds in lignin.
Keywordsionic liquids lignin pretreatment pyrolysis liquid products
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- 5.Couhert, C., Commandre, J.-M., and Salvador, S., Is it possible to predict gas yields of any biomass after rapid pyrolysis at high temperature from its composition in cellulose, hemicellulose, and lignin? Fuel, 2009, vol. 88, pp. 408–417.Google Scholar