In The Yellow Phosphorus Tail Gas Purification Removal Under The Conditions Of Low Temperature Micro Oxygen Cs < Sub > 2 < / Sub > Research

The production and export of yellow phosphorus take a large proportion in the world, which mainly distributed in the southwestern province in China. In recent years, the equipments which mainly product yellow phosphorus has been defined one of the high pollution and energy consumption industries. Yellow phosphorus tail gas which contain high concentration CO (>85%, vol.) can be used as the C1chemistry source. As a harmful gas existing in yellow phosphorus tail gas, CS2can affect the comprehensive utilization. So the separation of CS2from yellow phosphorus tail gas is particularly important. This thesis aimed to research adsorbents, the adsorption performance of CS2and reaction mechanism of transition metal oxides, transition metal phthalocyanines and rare earth oxide. Firstly, experiments were conducted to select carriers and active components of adsorbents. Secondly, single factor adsorption experiments of different adsorbents were studied. Thirdly, N2adsorption-desorption(N2-BET), scanning electron microscope(SEM), energy dispersive spectrometer(EDS), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) were used to characterize adsorbents before or after adsorption reactions. Finally, reaction mechanisms of catalysts were inferred by basic experiments and characterization.The carrier and active components respectively was coal activated carbon and transition metal oxides in researches. The results of experiments show it was Cu(Ac)2for the optimum pregnant, and the concentration was0.15mol/L,20℃for optimum reacting temperature, and400℃for optimum cremating temperature with2.0% oxygen content. Characterization technique of BET, SEM-EDS, XRD, XRD, XPS demonstrated that roasting link will contribute to physical properties and the performance of Cu modified activated carbon, and Cu species which was baed on CuO take part in the reaction as active components. Element Sulfur and sulfate as reaction products covered the adsorbent which led to the result of inactivation.Based on the previous studies, Cu-CoSPc-Ce adsorbent enhanced the effective time than Cu-CoSPc and Cu adsorbents. The concentration of Ce was0.15mol/L,400℃of cremation temperature were optimum conditions for preparing modified activated carbon. Oxygen content of2% and adsorption temperature of20℃were suitable conditions in adsorbing reaction phase. Characterization technique demonstrated that the addition of Ce made strong interactions with CuO and CO2O3. The performance was related to the first peak of CO2-TPD, and the activation energy of desorption was64.72kJ/mol.The thermal regeneration results of ACcu-coSPC-ce-cs2showed good regeneration performance and greatly decreasing the cost in industrial production. Regeneration after three times, when adsorption reactions last170min, purification efficiency of CS2was still higher than90%.