Process for producing kraft pulp

Details Process for producing kraft pulp Process for producing kraft pulp

D - Textiles, Paper

21

C

D21C 11/04 (2006.01)

Patent

CA 2504303

In the process for producing kraft pulp, there are provided (G) a potassium ion removal step of flowing an aqueous solution containing ashes recovered from a combustion exhaust gas generated in a black solution combustion step (E) by a dust collector through a packed bed filled with a sodium-type cation exchange resin to adsorb and remove potassium ions contained in the aqueous solution; and (H) a regeneration step of treating the cation exchange resin used in the potassium ion removal step (G) with an aqueous sodium hydroxide solution to regenerate the cation exchange resin, wherein a fraction recovered from the potassium ion removal step (G) which is rich in sodium sulfate and sodium carbonate is recycled to the black solution concentrating step (D), and a sodium hydroxide effluent recovered from the regeneration step (H) is recycled to a bleaching step (C) and reused therein.

L'invention porte sur un procédé de production de pâte kraft comportant les étapes suivantes: (G) élimination des ions potassium où une solution aqueuse de cendres recueillies par un collecteur de poussières dans le gaz de combustion provenant de l'étape (E) traverse un lit de blocs de résine sous forme sodique échangeuse de cations pour adsorber et éliminer les ions potassium et (H) régénération de la résine utilisée en (G) au moyen d'une solution aqueuse de soude caustique où la fraction riche en sulfate de soude et en carbonate de soude recueillie en (G) retourne à l'étape (D) de concentration de la lessive noire, et où les rejets de solution de soude caustique récupérés en (H) sont réutilisés dans l'étape de blanchiment.

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