Dissolution of LAS Micronized-residues with Sodium Chlorite

Pine organosolv residues containing 13.0% residual lignin was prepared by the LAS (low temperature, atmospheric pressure, and short reaction time) pulping method. In order to produce a series of LAS micronized-residues with different residual lignin contents from 3.0% to 9.0%, the LAS micronized-residues was treated by sodium chlorite. Each LAS micronized-residues was subjected to dissolution treatments in a urea/NaOH/water solution to investigate the effect of lignin content. With the decrease of residual lignin content of the LAS micronized-residues from 13.0% to 3.0%, the dissolution yield of residues was increased by only 2.5%, suggesting that the removal of residual lignin in the residues did not significantly affect the dissolution yield. This result indicated that the combination effects of DP (degree of polymerization), hemicellulose and lignin contents in the residues on dissolutions were involved in a complex way.