Rapid Characterization of Wood Pulp Lignin by Fourier Transform Raman Spectroscopy

摘要

FT-Raman spectroscopy is used for the rapid measurement of wood pulp ligmn. A total of 23 western softwood pulp samples with known kappa numbers (10-38) are used. Each sample is divided into three portions and scanned separately. The integrated area of the lignin band at approximately 1600 cm~(-1) is ratioed against the integrated area of the cellulose bands in the 1200-1010 cm~(-1) region and correlated to known kappa numbers. The measured ratios behave linearly with the kappa number (r = 0.99) andcan be reproducibly determined with an error of approximately 2% or less. The data are presented and discussed in view of the potential for at-line analysis of lignin associated with chemical delignification of wood pulp.