Removal of sodium chloride from pulp mill operations

Details Removal of sodium chloride from pulp mill operations Removal of sodium chloride from pulp mill operations

D - Textiles, Paper

21

C

9/36.8

D21C 11/00 (2006.01) C01D 3/06 (2006.01) C01D 7/00 (2006.01)

Patent

CA 1070457

ABSTRACT OF THE DISCLOSURE Sodium chloride is removed from pulp mill systems in which the smelt from the spent pulping liquor recovery operations contains sodium carbonate and sodium chloride, and optionally other components, depending on the pulp mill system. The smelt is made up into a hot aqueous solution thereof, and is evaporatively cooled to crystallize hydrated sodium carbonate, while avoiding deposition of sodium chloride and until the cooled solution is saturated with respect to sod- ium chloride. After separation of the crystallized sodium carbonate, and other crystallized salts, for example, sodium sulfide and sodium sulfate if a Kraft mill system is employed, the mother liquor is evaporated with heating to deposit sodium chloride in a substantially pure form. The sodium carbonate may be converted into an active pulping chemical for recycle, typically into sodium hydroxide by recausticization.

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