Research of Removing HSS from Organic Amine Desulphurization Solution

In amine FGD process, great amount of SO₄^2- rapidly cumulate in the amine desulfurization solution. This paper compares the three types of desalination method, respectively Chemical precipitation, ion exchange method and Cooling crystallization, the experiment results show that: Chemical precipitation method can remove 68.51% SO₄^2-, while 97.46% SO₃^2- is separated, Cooling crystallization method, SO₄^2- removal rate can reach 86.45% at 7°C when the molar of Na⁺ and SO₄^2- ratio is 1.61. Ion exchange method can not effectively remove SO₄^2- from high concentration solution, but considerable Cl^- and NO₃^- is adsorbed by the resin, Cooling crystallization combined with ion exchange resins method can effectively remove SO₄^2-, Cl^-, NO₃^- and other HSS, Obviously better than single ion exchange method.