Mini Oxygen Stages: More Delignification with Less Capital, 2000 Pulping / Process & Product Quality Conference Proceedings

T. J. Dyer, L. A. Lucia, A. J. Ragauskas--The delignification properties of a conventional O-stage and a mini-O treatment were studied with a SW kraft pulp. Delignification studies indicated that a (E+O) or (E+O)(E+O) treatment could remove only 36% of the lignin that a conventional oxygen stage can accomplish. The application of a 0.05 kappa factor charge of chlorine dioxide prior to (E+O)(E+O) or between the two mini-O stages (i.e., (E+O)Dkf:0.05 E+O)) can improve the overall delignification properties, yielding approximately 77% of the performance of a conventional O-stage. The milder conditions of the mini-O treatments were also shown to yield pulps with higher viscosities. Additional investigations into the effects of interstage washing suggest that not washing between stages of (E+O)Dkf:0.05(E+O) or Dkf:0.05(E+O)(E+O) did not significantly impact the overall pulp delignification properties or pulp viscosities.

Author: Dyer, T.J., Lucia, L.A., Ragauskas, A.J.
Mini Oxygen Stages: More Delignification with Less Capital,
Mini Oxygen Stages: More Delignification with Less Capital, 2000 Pulping / Process & Product Quality Conference Proceedings
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