Treatment of pulp with a chelating agent without using a...

Details Treatment of pulp with a chelating agent without using a... Treatment of pulp with a chelating agent without using a...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 9/02 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2275257

A method at chlorine-free bleaching of pulp where metals are removed by means of chelating agent. The chelating agent is mixed with the pulp in at least one effective mixing step without intermediate washing, whereafter the pulp without an intermediate tower passes directly to a pulp washer. The total retention time shall be at maximum 15 minutes, calculated after the chelating agent addition.

L'invention concerne un procédé de blanchiment de pâte sans chlore, selon lequel on enlève les métaux au moyen d'un chélateur. Le chélateur est mélangé à la pâte lors d'au moins une opération efficace sans lavage intermédiaire. Ensuite, la pâte est directement amenée à un dispositif de lavage sans passer par une tour intermédiaire. Le temps total de rétention doit être de 15 minutes maximum, à compter de l'adjonction du chélateur.

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