Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Reexamination Certificate
2003-09-11
2009-06-30
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
C210S660000, C210S670000, C162S029000, C162S030100, C162S031000, C162S035000, C162S037000
Reexamination Certificate
active
07553394
ABSTRACT:
In the process for producing kraft pulp, performing 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 by a dust collector through a packed bed filled with a sodium-type cation exchange organic resin to adsorb and remove potassium ions contained in the aqueous solution; and a regeneration step of treating the cation exchange organic resin used in the potassium ion removal step with a solution consisting essentially of aqueous sodium hydroxide to regenerate the cation exchange resin, where a fraction recovered from the potassium ion removal step which is rich in sodium sulfate and sodium carbonate is recycled to the black solution concentrating step, and a sodium hydroxide effluent recovered from the regeneration step is recycled to a bleaching step and used in a bleaching process.
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patent: 5980717 (1999-11-01), Pudas et al.
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English Machine translation of JP 2002-138382 Kono et al.
Smook, Handbook for Pulp and Paper Technologists, 1992, Angus Wilde Publications, 2nd Edition, p. 74-77, 148-150,163-164, 174-175.
Furusho Saburo
Kawano Norio
Wakamoto Shigeru
Calandra Anthony J
Hokuetsu Paper Mills Ltd.
Hug Eric
Nippon Rensui Co.
Nixon & Vanderhye P.C.
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