Study Of Dimethyl Sulfoxide Microemulsion Circulation Desulfurization

This thesis analyzed the process of DMSO microemusion absorbing sulfur dioxide. A series of different model DMSO microemulsions were prepared by Schulman method, and selected suitable emulsifier ratio. Through determination of the microemulsion desulfurized efficiency under different conditions, the circulation desulfurization performance was inspected. Sulfur dioxide concentrations were determined by formaldehyde absorbing-pararo- saniline spectrophotometry.Microemulsion was prepared by using diesel oil as oil phase, DMSO as water phase (O/W volume proportion was 1:9), Span80 and isoamyl alcohol as emulsifier (the volume proportion was about 1:1). Using this system, the author gained the maximal quality proportion of DMSO which was 74.09%.The results showed that the absorption of sulfur dioxide by the microemulsion was very good. The efficiency of absorption was above 99% when absorb temperature was 30 oC. In a large amount of air, desulfurization product (NH₄)₂SO₃ was oxidized into stabilized (NH4)2SO4, and it would not caused secondary pollution.In the recycled absorbing liquid, which included DMSO microemulsion, H₂O and aqua ammonia, with Mn²⁺ solution instead of H₂O, in this way, layered speed was improved. Cycle experiments have been done under the conditions: the rate of SO₂ and air flow was 1:7, the volume of microemulsion and H₂O was 1:1, Mn²⁺ solution concentration was 0.05 mol/L, aqua ammonia was 0.5 mL and the cycle period was 5 min. The absorption efficiency was more stable with the increase of cycle times, and it was more than 98%.After concentrated and purified, (NH₄)₂SO₄ products has been gotten. The results of these cycles were excellent, and the method was energy-saving and high efficiency.