Recausticizing kraft green liquor

Details Recausticizing kraft green liquor Recausticizing kraft green liquor

D - Textiles, Paper

21

C

9/24

D21C 11/12 (2006.01) D21C 11/14 (2006.01)

Patent

CA 1268303

ABSTRACT A process of recausticizing kraft green liquor in which the green liquor containing sodium carbonate is passed in a stream in admixture with particles comprising slaked lime, in which stream the liquid phase becomes progressively weaker in sodium carbonate and stronger in sodium hydroxide. Lime is added in order to provide a continuous supply of slaked lime for reaction with the sodium carbonate, and the stream is passed to a solids/liquid separator which recovers liquid phase from said stream, strong in NaOH, continuously and separately from the solid phase of the stream, as white liquor. The rate of the recausticizing reaction is limited by the rate of diffusion of carbonate ion into the solid particles, and of hydroxyl ion out of the solid particles. Typically, these rates limit the amount of causticizing achieved to less than the equilibrium value. In order to overcome this diffusion limitation, more reaction time for partially reacted lime particles is provided by recycling slurry solids.

529720

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