Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions |
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Authors: | Simon Piché |
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Affiliation: | Department of Chemical Engineering, Laval University, Ste-Foy, Que., Canada PQ G1K 7P4 |
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Abstract: | The oxidative absorption of hydrogen sulfide (H2S) into a solution of ferric chelate of trans-1,2- diaminocyclohexanetetraacetate (CDTA) was studied in a counter-current laboratory column randomly packed with 15 mm plastic Ralu rings. The present investigation takes concern about the Kraft pulping situation where dilute H2S concentrations are omnipresent in large-volume gas effluents. A fractional two-level factorial approach was instigated to determine the significance of six operating variables, namely the solution's alkalinity (pH; 8.5-10.5), the liquid mass flow rate (L;1.73-), the solution's ionic strength (IC;0.01-), the gas mass flow rate (G;0.19-), the inlet H2S concentration (CH2S,0;70-430 ppm) and the initial ferric CDTA concentration (CFe,0;100 -). Initially, a Plackett-Burman design matrix of seven duplicated experiments revealed that pH is the leading factor controlling the H2S conversion rate while the ionic strength and ferric CDTA concentration effects remained negligible within the factorial domain. Surface response analysis based on 11 duplicated factorial experiments plus 10 central composite trials revealed that the H2S conversion significantly increases with liquid flow rate but decreases with growing H2S load up. Further examination about the influence of ferric CDTA on H2S absorption rate was set up over a broader concentration range (CFe,0;0- at pH of 9.5 and 10.5. It showed good potential at as H2S conversion increased by a significant 25% for both pH values in comparison to pure alkaline solutions containing no ferric CDTA. |
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Keywords: | Environment Packed bed Multiphase reaction _method=retrieve& _eid=1-s2 0-S0009250905003799& _mathId=si95 gif& _pii=S0009250905003799& _issn=00092509& _acct=C000054348& _version=1& _userid=3837164& md5=20744672208c61f0eab28d0ac167028b')" style="cursor:pointer H2S absorption" target="_blank">" alt="Click to view the MathML source" title="Click to view the MathML source">H2S absorption Ferric chelate Factorial analysis |
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