Abstract
An environmentally friendly removal method based on a membrane process for the purification of aqueous amine solution for use in carbon dioxide absorption was analyzed. Two kinds of commercial solvent resistant nanofiltration (SRNF) membranes (Desal-DL and SR100, polymeric) were chosen, and their capabilities in removing three common contaminants from diethanolamine (DEA) solution were examined. These contaminants that caused foaming of DEA solution include sodium chloride, sodium sulfite, and acetic acid. From the two tested solvent resistant nanofiltration (SRNF) membranes, it had been found that Desal-DL membrane provided promising results and performance that can be an alternative to conventional separation, including distillation, for purification of amine solution. Experiments were also conducted to test the foaming tendency and stability of the untreated and treated amine solution. The untreated DEA with sodium sulfite had the highest foaming tendency. However, after NF treatment, there was substantial decrease of the foaming tendency. The results obtained confirmed the potential of using SRNF-membranes to reduce foaming tendency and stability in DEA solution.
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