论文信息 - CONTRIBUTION TO THE STUDY OF HYDROXYMETYLATION REACTION OF ALKALI LIGNIN

CONTRIBUTION TO THE STUDY OF HYDROXYMETYLATION REACTION OF ALKALI LIGNIN

The hydroxymethylation of alkali lignin with formaldehyde in alkaline solution was studied. The influence of reaction conditions of the hydroxymethylation of alkali lignin was followed by modifying the temperature, time, and the ratios of NaOH to lignin and CH2O to lignin. Three different types of alkali lignin were utilized. The reaction was followed by total consumption of formaldehyde, and the resulting products were characterized through FTIR-spectra, thermogravimetry analysis, ash and moisture contents, as well as by the amounts of OH groups.

[1] A. R. Gonçalves,et al. Eucalyptus organosolv lignins: study of the hydroxymethylation and use in resols , 1999 .

[2] B. Riedl,et al. Study on the kinetics of lignin methylolation , 1993 .

[3] N. Özmen,et al. Studies on Lignin-Based Adhesives for Particleboard Panels , 2003 .

[4] D. Argyropoulos,et al. Determination of Hydroxyl Groups in Lignins Evaluation of 1H-, 13C-, 31P-NMR, FTIR and Wet Chemical Methods , 1994 .

[5] Rubie Chen,et al. Modified lignosulfonate as adhesive , 1994 .

[6] B. F. Griggs,et al. Utilization of softwood kraft lignin as adhesive for the manufacture of reconstituted wood , 1994 .

[7] Julián García,et al. Characterization and structural modification of ammonic lignosulfonate by methylolation , 2001 .

[8] M. Kuo,et al. Alkali Treated Kraft Lignin as a Component in Flakeboard Resins , 1991 .

[9] J. Marton,et al. Alkali-Catalyzed Reactions of Formaldehyde with Lignins , 1966 .

[10] G. Gellerstedt,et al. Determination of phenolic hydroxyl groups in residual lignin using a modified UV-method , 1999 .

[11] M. El-Sakhawy,et al. Infra-red spectroscopic study of lignins , 1998 .