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Tekai Akuetteh,Adam Andrew Donaldson 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
The viability of two solid adsorbents, limestone and cement powder, for use in a flow-through packed-bedcolumn for HCl and HF gas neutralization following refrigerant destruction was studied. Neutralization tests performedat 408 K using 5% HCl in N2 and 5% HF in N2, showed that limestone had a significantly higher adsorption capacityfor both HF and HCl. ~49% of fed HCl, and between 7.8%-16.2% of fed HF gases were adsorbed by 7 g of limestonefor a gas flow rate of 6.67×10−6m3/s (STP) over 30 to 180 minutes. Effective diffusivities (De) of HCl and HF intothe limestone particles were 1.5×10−9and 2.2×10−9m2/s, respectively, indicating that a solid diffusion mechanism dom-inance would limit the suitability of this method as a solid adsorbent in the tested form. Under these conditions, com-plete particle conversion times were 227 hours for HCl-limestone and 154 hours for HF-limestone. Considering thelong conversion times observed, shorter conversion times would require micron-scale particle sizes, suitable for entrainedflow but not for a packed-bed arrangement. A Na2CO3/Limestone slurry used to neutralize the reactor effluent provedefficient within this system, and may be a more suitable alternative for acid neutralization involving HF.
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