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A fixed-resin bed system employing an amphoteric ion-exchange resin was used to separate green liquor from a kraft mill into sodium hydrosulphide-rich and sodium carbonate/hydroxide-rich components. Depending on the conditions used, the separation efficiencies ranged from 80 to 96% for sodium hydrosulphide, 90 to 95% for sodium carbonate and 74 to 92% for sodium hydroxide. Three possible applications for green liquor splitting are discussed. These are: the removal of excess sodium from green liquor (i.e., when alkaline extraction filtrate is recycled to the recovery system in a kraft mill), chemical cross recovery between a semichemical and a kraft mill, and recovery of excess sodium from waste chlorine dioxide generator saltcake.
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Caustic Soda Production from Green Liquor Using the Green Liquor Splitting (GLS) System, 2004 Intern