Evaluation of Amine Solutions for CO2 Absorption
Technologies to separate, recover, and reuse CO2 (CCS or CCUS) are being studied as a countermeasure to carbon emissions and global warming. CO2 recovery methods include chemical absorption, physical absorption, membrane separation, etc. The most appropriate method is selected depending on the CO2 concentration, pressure, and emission source properties. Among these methods, various studies are being conducted globally on the chemical absorption method using amine solution, which binds strongly to CO2 through chemical reaction, since it has the advantage of being applicable to low partial pressure CO2 such as combustion exhaust gas due to its high reactivity.
Evaluation of Amine Solutions for CO2 Absorption by TOC/TN
The Shimadzu Total Organic Carbon Meter TOC-L was added to the Total Nitrogen Unit TNM-L to measure the CO2 absorption of amine solutions and the TN and TOC measurements of amine solutions. The IC measurement of amine solutions enables the evaluation of the separation and recovery process of CO2 by amine solutions by determining inorganic carbon concentrations such as dissolved CO2 and bicarbonate ion concentration. It is also possible to control the concentration of amine solutions by measuring TOC/TN.
Evaluation of the Quantity of CO2 Absorbed by an Aqueous Amine Solution
—Evaluation of the Quantity of CO2 Absorbed Using the CGT-7100 and TOC-L—
Here is an example of a CO2 absorption experiment using an aqueous amine solution with the Shimadzu CGT-7100 portable gas concentration analyzer and the Shimadzu TOC-L total organic carbon meter as the means of evaluation.The CGT-7100 has a wide range of sample gas flow rates and can be used for a variety of experiments and evaluations whether it be for a single laboratory or an entire plant. The TOC-L can also be used to measure inorganic carbon concentrations such as dissolved CO2 and bicarbonate ions contained in CO2 absorption solutions.
The TOC-L series of TOC analyzers adopts the 680°C combustion catalytic oxidation method, which was developed by Shimadzu and is now used worldwide. While providing an ultra wide range of 4 μg/L to 30,000 mg/L, these analyzers boast a detection limit of 4 μg/L through coordination with NDIR.
720 ºC catalytic thermal decomposition/chemiluminescence methods are adopted for TN measurement. There is no interference from metallic ions or bromine in sea water.
The CGT-7100 analyzer measures the concentration of gases in a continuous way, using a ratio photometric non-dispersive infrared absorption (NDIR) method. All pretreatment parts required for measurement, such as the pump, filter, and electric dehumidifier, are built-in. The analyzer can measure three components including CO, CO2, or CH4 (any two of these) and O2, and is compatible with measurement at 100 vol%.