A series of experiments in a commercially available membrane mini-module was conducted in order to validate the capability of removing CO2 from gas mixtures. Various liquid solvents were tested at different operating conditions, such as pure water and aqueous solutions of NaOH or KOH (0.5 and 0.25 M) concluding that
NaOH is a better reactant than KOH. In the case of chemical solvents the absorption of CO2 is complete with very low consumption of the liquid compared to the physical absorption, which is likewise complete but with a higher liquid to gas flow rate ratio. The chemical reaction enhancement because of the presence of NaOH or KOH undermines the resistance of the liquid phase to mass transfer, thus making the gas phase the controlling stage of the absorption.
The mini-module is capable of removing undesirable species using rather mild solvents, showing very good behavior for every liquid and gas flow rate examined.
The experimental data were obtained within the framework of the European program HYDROSEP (contract RFCR-CT-2006-00003) and was partly funded by the European Commission. Liqui-cel web site is http://www.liqui-cel.com (Accessed on April 2008).
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