Effects of Chloride, Potassium and Sulfate on the Causticizing Reaction in the Kraft Recovery Process, 2007 Engineering, Pulping & Environmental Conference

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The effects of chloride (Cl) potassium (K) and sulphate (SO₄) on the equilibrium of the causticizing reaction are studied over a wide range of causticizing conditions, using OLI, an advanced thermodynamic program for equilibrium calculations in aqueous solutions of ionic salts. The results show that Cl, K and SO₄ have little or no effect on the causticizing equilibrium. Under a given causticizing condition, coastal mills, due to their much higher NaCl concentration, are predicted to have a causticizing efficiency 1 to 2% lower than that of in-land mills.