Studies on flue gas desulfurization using EDA/SiO2–phosphoric acid solution as an absorbent

Abstract

Flue gas desulfurization by immobilized amines is a new desulfurization technique. EDA/SiO₂ and an H₃PO₄ additive were used as an absorbent for desulfurization. SO₂ was absorbed by the system and desorbed from the loaded solution. And the cycling operation was also analyzed in the experiments. Some technological conditions such as the amount of EDA/SiO₂, the temperature, concentration of SO₂ and pH value were experimentally researched. With the optimized process, the absorption efficiency of this system could reach 98% and the desorption efficiency was over 50%, showing good absorption/desorption capability and promising potential to be applied in desulfurization.