Method of recovering caustic soda from spent pulping liquors

Details Method of recovering caustic soda from spent pulping liquors Method of recovering caustic soda from spent pulping liquors

D - Textiles, Paper

21

C

9/36.7

D21C 11/12 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1283256

METHOD OF RECOVERING CAUSTIC SODA FROM SPENT PULPING LIQUORS ABSTRACT A method of recovering sodium hydroxide from alkaline or neutral spent pulping liquor by the addition of metallic oxides, with the exclusion of a Sc, Ti, V, Fe, Cu, Cd or Hg oxide, to the spent liquor in order to directly convert sodium carbonate into sodium hydroxide, followed by separation and recycling of the metallic oxides to the spent liquor.

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