For the desulfurization of carbon dioxide, catalytic oxidation process is useful, especially for the carbon dioxide obtained when crude oil of high sulfur content is used as charge stock for oil gasification under pressure, and generated gas goes into CO conversion without desulfurization, and then carbon dioxide is absorbed and regenerated.The merits of this process and the catalysts were studied as shown in previous report.
This report reveals the study results on below mentioned processes after catal-oxidation.First, a small amount of sulfur and residual H
2S are removed from oxidized gas, and then SO
2 in the gas is absorbed by sulfite-bisulfite solution.Conc.H
2SO
4S is added to decompose this solution and the generated SO
2 is recovered.The yield of SO
2S greater than 99.5% is easily obtained.The decomposition condition must be controlled to utilize the decomposed solution to(NH
4)
2SO
4 manu-facture.The exit gas from the desulfurization unit contains a small amount of residual oxygen, which can be removed by catalytic combustion of hydrogen if necessary.
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