With carbon dioxide emissions growing by the year, it is becoming ever more important that new methods or processes be devised to capture CO2 for sequestration. Capturing emissions produced from fossil-fueled power plants requires a different approach from that of vehicular or otherwise.
The following thesis seeks to address a major stumbling block to the global widespreadapplication of solvent absorption as an effective CO2 capture technique from aforementioned power plants-its associated high costs of CO2 recovery. A novel was technique proposed suggesting the use of a control agent as a catalyst to alter the pH value in a conventional solvent absorption-desorption system. It is anticipated that this process, if feasible, will reduce recovery energy requirements and thus costs. What is yet to be determined is the potential solvents and control agents suitable for experimentation.
An analysis conducted to determine prospective solvents suitable for this process found that Methyldiethanolamine (MDEA), PSR, KS-1 and KS-2 solvents were appropriate to be selected for experimentation based on their excellent absorption and desorption performances.
With scarce prior art regarding the use of pH control in CO2 capture processes, an analogous method for SO2 absorption and subsequent recovery utilizing adipic acids was employed as an indicator to select potential control agents. The results yielded dicarboxylic acids, namely those with excellent pH buffer range and corresponding solubility in water such as Oxalic acid, Phthalic acid and Suberic acid were suitable to be tested in tandem with the solvents mentioned earlier.
With the information supplied, an experimentation method is suggested that should help to determine if pH swing is indeed a feasible method of CO2 absorption.