Removal Of Low Concentration COS With ACF Modified

Pure carbonyl sulfide(COS) is a kind of gas without odor and color. It even combusts and explodes easily and experiment are likely to be eroded by it so that the pipelines are often blocked. Tail gas and other gases containing it would pollute the air terribly and it can transform a kind of mephitic gas hydrogen sulfide with rotten-eggs odor which is harm to humans. Although its concentration is lower, it can't be removed easily. Thus, to remove low concentration COS is an important issue.On the basis of background of this paper, three aspects about how to remove low concentration COS with ACF have been studied. The main contents were listed as follows:1. A study of removal of low concentration COS by using modified ACF containing transitional metalsThe activated carbon fibres were modified with some transitional metal ions such as Co²⁺, Ni²⁺, Fe³⁺, Cu²⁺, Zn²⁺ by the impregnation method. Some factors which maybe affect the performance of removing carbonyl sulfide such as the kinds and the concentration of transitional metal ions, the components of feed gas, condition of reaction, relative humidity and the temperature were investigated on the fixed-bed reactor. It was showed that the activated carbon fibres modified with Co²⁺ had a higher sulfur capacity than the others. And the mechanism of removal carbonyl sulfide with transitional metal ions was deduced.2. The research of simultaneous removing COS and H₂S using ACF in feedstock of CO₂The activated carbon fibres were modified with some alkali and ions such as NaOH,KOH,Na₂CO₃,K₂CO₃ and Co²⁺,Fe³⁺ by the impregnation method and some factors which maybe affect the performance of removing COS and H₂S such as the kinds and the concentration of alkali and metal ions, the components of feed gas, and the temperature of reaction were investigated on the fixed-bed reactor. It was showed that the modified activated carbon fibres had a higher sulfur capacity than the activated carbon fibres modified with alkali and the activated carbon fibres modified with metal ion had a higher sulfur capacity than other modified activated carbon fibres. In addition, the activated carbon fibres modified with Co²⁺ had a better impact of simultaneous removal of COS and H₂S than the others.3. A study of regeneration method for ACF modified using removing low concentration COSActivated carbon fibre used by removing low concentration COS were regenerated with solvent method and gas method respectively. During the course of regeneration, the effects of some factors which include the regeneration time and temperature were studied through investigating the performance of desulfuration of regenerated ACF. It was showed that solvent regeneration method and gas regeneration method were all effective regeneration methods. The regeneration method of water has better effective in solvent regeneration method and the regeneration method of nitrogen gas has better effective in gas regeneration method.