Sorption of Hydrogen Chloridein The Fluidized Bed Reactor

Olek, Małgorzata; Żukowski, Witold; Baron, Jerzy

doi:10.1515/eces-2019-0006

Abstract

Combustion of fuels, including renewable fuels and thermal treatment of waste (CFCs, pesticides), is associated with emissions of pollutants including halogens. The reversible process of sorption/desorption of HCl, in a fluidized (bubbling) bed reactor (BFB), during co-combustion of Cl-materials, was carried out. The thermal decomposition of methylene chloride (DCM, CH₂Cl₂) in an inert sand bed with the addition of the hydroxyapatite sorbent (HAp, Ca₅(PO₄)₃(OH)) was investigated. The process parameters were as follows: temperature - 930 °C, the air excess - 1.3, stream rate of CH₂Cl₂ - 50 cm³/h. The concentration of HCl, CCl₄, CHCl₃, CH₂Cl₂, CH₃Cl, COCl₂ in the exhaust gases were monitored online with FTIR spectroscopy. The main chlorine product was hydrogen chloride. Samples of unprocessed HAp, taken from the bed during the process, and solid apatite residues were analyzed by X-ray diffraction (XRD). The content of chlorapatite (Ca₅(PO₄)₃Cl) in the analyzed samples was respectively 11, 53 and 19 %. X-ray fluorescence (XRF) analysis showed the molar ratio of Ca:P:Cl was: 1.00:0.36:0.01, 1.00:0.36:0.09, 1.00:0.37:0.04 respectively. The HAp could be used as an sorbent of the HCl_(g) during combustion of materials containing chlorine.

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Sorption of Hydrogen Chloridein The Fluidized Bed Reactor

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