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Title
Lignin purification with green solvents
Authors
R. PRADO X. ERDOCIA L. SERRANO and J. LABIDI
Received
November 21, 2011
Published
Volume 46, Issue 3-4 March-April
Keywords
lignin, ionic liquid, purification
Abstract
Nowadays, lignin is gaining importance as a potential source for aromatic chemicals. Commercial lignins are usually contaminated with cellulose, hemicelluloses and other inorganic impurities, which constitute an obstacle in their direct processing for obtaining aromatic precursors. In this work, lignins obtained from Malus domestica by alkaline extraction (7.5% NaOH, 90 min, 90 ºC) and organosolv (60% ethanol, 90 min, 180 ºC) processes were treated with green solvents, to reduce their impurities. The green solvents used were water and [BMI][MeSO], and the obtained 4 lignin was characterized by different techniques (ATR-IR, TGA, and HPLC). The results showed that soda lignin has more impurities than organosolv lignin, and that ionic liquid (IL) is the best purification method.
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