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9556767 
Journal Article 
Studies on the organic acid lignin from rice straw 
Jahan, MS; Lee, Z; Jin, Y 
2006 
18 
1 
45-50 
English 
Isolated lignins from the spent liquor of rice straw formic acid pulping, residual formic acid pulp have been investigated by UV, FT-IR and 1HNMR spectroscopy and compared with soda-AQ liquor and dioxane rice straw lignins. The UV spectra showed two absorption maxima at 280 and 310nm in all lignins, which are common in grass lignin. Strong band was observed at 1720 cm-1 in FT-IR spectra in formic acid liquor and pulp lignins as compared to soda-AQ liquor and dioxane rice straw lignins. NMR spectra showed that lignins were to undergo demethylation, condensation, ring opening, formylation of hydroxyl groups during formic acid pulping. 
Demethylation and Ring opening; Formic acid lignin; Hydroxyl group; Rice Straw