Comparison of sodium carbonate solution and sodium hydroxide solution in tail gas purification

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Personal opinion: Our factory currently uses a sodium hydroxide solution with a concentration of 30-40% to scrub the exhaust gases. The solubility of sodium hydroxide at 20 degrees Celsius is much higher than that of sodium carbonate solutions; if a sodium carbonate solution is used for leaching, its low concentration requires frequent replenishment. Moreover, the reaction rate of sodium carbonate with sulfur dioxide is far slower than that of sodium hydroxide. Therefore, I believe that using sodium carbonate for leaching will not achieve the requirement of 200 mg/Nm3. Solubility data: 1. Sodium carbonate – Temperatures: 0℃, 10, 20, 25, 30, 40, 50, 60, 80, 100; Solubility: 7, 12.2, 21.8, 29.4, 39.7, 48.8, 47.3, 46.4, 45.1, 44.7. 2. Sodium hydroxide – Temperatures: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100; Solubility (in grams): 42, 51, 109, 119, 129, 145, 174, 299, 314, 329, 347. Last edited by liliang473 on 2008-11-14 at 11:20