Abstract
CO 2 at very low pressure was absorbed in a stirred cell into aqueous solutions of MEA and DEA. The rates of absorption were determined from the fall in pressure. The results were analysed on the assumption (for which experimental support is given) that the solubilities and diffusivities Of CO 2 in these solutions bear a constant proportionality to those of N 2O, which have been measured. The results for MEA at 25°C agree very closely with those of Hikita et al.[1], determined by a rapid-mixing thermal method. The results for DEA appear to support a reaction mechanism proposed by Danckwerts[13], the reaction tending to be second-order in amine at low concentrations and first-order at high concentrations.
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