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Comparison of Various Alkaline Solutions for H 2 S/CO 2 ‐Selective Absorption Applied to Biogas Purification
Author(s) -
Dubois L.,
Thomas D.
Publication year - 2010
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201000171
Subject(s) - hydrogen peroxide , chemistry , biogas , data scrubbing , amine gas treating , absorption (acoustics) , scrubber , selectivity , ammonia , inorganic chemistry , nuclear chemistry , organic chemistry , materials science , catalysis , waste management , engineering , composite material
Biogas is a common renewable energy resource. A very important stage of biogas upgrading, studied in the present work, is its purification from H 2 S traces. The selective absorption of H 2 S and CO 2 into oxido‐alkaline solutions containing hydrogen peroxide and into amine solutions was compared by performing absorption test runs in a cables‐bundle scrubber at 293.15 K and atmospheric pressure. The absorption rate and selectivity for H 2 S over CO 2 were determined for various solute partial pressures, different alkaline absorbents and hydrogen peroxide concentrations in the scrubbing liquid, and different pH values. Higher H 2 S‐selective absorption performances with oxido‐alkaline solutions than with amine solutions could be observed provided that the solution is at a low pH value (9.5) and contains a sufficient hydrogen peroxide concentration.