PROCESS FOR PRODUCING KRAFT PULP

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 ca...

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Bibliographic Details
Main Authors WAKAMOTO,S, KAWANO, NORIO, FURUSHO, SABURO
Format Patent
LanguageEnglish
French
German
Published 03.10.2007
Edition7
Subjects
APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
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Summary: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.
Bibliography:Application Number: EP20030748523