B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/349
B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01B 17/50 (2006.01) C01B 17/74 (2006.01) C01D 5/00 (2006.01) C01F 5/08 (2006.01) C01F 5/30 (2006.01) C01F 5/40 (2006.01) C01F 11/24 (2006.01)
Patent
CA 1263908
TITLE A METHOD OF REMOVING SULPHUR DIOXIDE FROM A GASEOUS STREAM INVENTOR Joseph Palmer ABSTRACT OF THE DISCLOSURE Capture-fixation of SO2 from flue and non-ferrous smelter gases is achieved with the use of MgO aqueous slurry as an absorbing medium. During the absorption, most of the MgO is converted to MgSO4 and the rest is solubilized as MgSO3 and Mg(HSO3)2. The clear solution having a pH in the range of about 3 to 5 obtained at the end of the absorption is brought to about 40°C and is treated with sulphuric acid in an amount representing at least 5% in excess of the stoichiometric requirement whereby sulphite and bisulphite of magnesium are converted to magnesium sulphate. The magnesium sulphate obtained above can be used in a two stage addition of potassium chloride to obtain magnesium chloride, and calcined dolomite added to the remainder whereby magnesium hydroxide is precipitated and may be filtered off from the resulting CaC12 solution. The process provides a means of removing SO2 from flue and smelter gases and at the same time produces industrially important chemical products (SO2, H2SO4, K2SO4, MgO/ CaC12).
533248
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