This result shows that the CO2 partial pressure, < 3 kPa, is the region where the pseudo 1st order reaction criterion for calculating the reaction rate constant of the MEA + CO2 system will apply.
At the same time, the results show that the gas phase resistance affects the measurement of the kinetics parameter.
This is although the PCO2 is lower than 3 kPa, the pressure of inert gas is about 3.2 kPa at 298.15 K and 12 kPa at 323.15 K, which is nearly equal to the PCO2 and even higher if the temperature is higher.
It is noted that the slope b is almost the same when the solution was used three times, this means that the low CO2 loading in the solution has negligible influence on the result.