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The main purpose of the Extended Oxygen Delignification (EOD) is to increase the efficiency of the fiber lines, using the concept that the Oxygen delignification is the extension of the process started at the cooking.

Nowadays it is known that the Oxygen offers a more selective delignification then the cooking, since the operational conditions (temperature, time, pressure, chemicals and its dosages) are milder. As a result, for a same kappa number the pulp obtained through the EOD process presents higher viscosity and, in consequence better strength properties.
 
 
 
Extended Oxygen delignification (EOD)
   
 
Implementing the EOD process requires an integrated vision of the cooking process and Oxygen delignification, where the cooking is made under milder conditions (smaller dosages of active alkali, temperature and time of cooking), resulting in pulp with higher levels of lignin (larger kappa number). The EOD process continues the delignification up to the necessary stage for bleaching.

Below we mention the main benefits of the EOD process:
 
 
Increase in the cooking efficiency, with less wood usage;
Larger cellulose production with the same volume of wood;
Reduction of the alkali charge used in the digester, with less usage of active alkali;
A more selective delignification, resulting in better viscosity and strength properties;
Smaller solids load for the boiler, debottlenecking the recovery system.
   
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