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We describe the use of a gas bubbler apparatus in which the gas phase is bubbled into a fixed amount of absorbent under standard conditions as a uniform procedure for determining the absorption capacity of solvents. The method was systematically applied to determine the CO 2 absorbing capacity of MEA ( A c ) at several aqueous MEA ( β ) and gas‐phase CO 2 concentrations. A c approached the nominal CO 2 absorbing capacity of MEA (720 g CO 2 /kg MEA) at very low β levels, increasing from 447.9 ± 18.1 to 581.3 ± 32.3 g CO 2 /kg MEA as β was reduced from 30 to 2.5% (w/w). A c did not depend on the CO 2 concentration in the inlet gas stream as long as the gas stream did not include other amine sensitive components. During the bubbling tests the outlet CO 2 concentration profiles exhibited a sigmoidal shape that could be described by an exponential equation characterized by an efficiency factor ( a ) and a form factor ( n ). Statistical analysis based on correlation analysis indicated that in all cases the experimental data fit the equation well when a was 6.1 ± 0.35 and n was 2.5 ± 0.12. The results of these experiments may be used to optimize scrubber designs for CO 2 sequestration from fossil fuel derived flue gases.
Huertas et al. (Thu,) studied this question.