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Oxygen delignification is considered as an extension of the
cooking process started at the digester, however in milder
conditions. Its objective is to remove the remaining lignin
in the non-bleached pulp. The normal delignification rate
obtained is of 35% for hardwood (eucalyptus) and 45% for softwood
(pine).
This process is usually under pressure and alkali conditions,
and the medium consistency process (MCOD) is more used in
the pulp mills.
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| Oxygen Delignification (MCOD) |
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| The main benefits from the Oxygen delignification are related
to the environment. This is due to the fact that two of the
main products used (Oxygen and Alkali), as well as the organic
and inorganic material removed from the pulp, are consistent
with the Kraft process recovery system.
Main benefits:
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Additional delignification within the range of
35 to 50%, depending on the raw material used; |
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Reduction in the consumption of other chemicals
used for bleaching (chorine, chorine dioxide, hydrogen peroxide
and ozone); |
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Reduction on the bleaching's environmental impact
through a smaller generation of chlorinated organic compounds
(AOX), smaller levels of BOD, COD and effluent color; |
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Allows favorable conditions to obtain a higher
and more stable brightness; |
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Allows a more selective delignification, with
higher preservation of pulp's strength properties. |
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Would you like more information? Contact
us |
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