MODELLING OF CO2 SOLUBILITY IN N-METHYLDIETHANOLAMINE AQUEOUS SOLUTIONS USING MODIFIED KENT-EISENBERG MODEL

In this project, the main objective is to develop the Modified Kent-Eisenberg
model by using computer software. This model has the important advantage of
computational simplicity and thus, is selected in this study. Besides that, the objective is
also to test the Modified Kent-Eisenberg model on experimental data of Xu et al. (1998)
to see the model performance under extended operating pressure and temperature.
From the results and discussion, the Modified Kent-Eisenberg model is considered
able to give a good prediction of CO2 solubility data in aqueous MDEA solution at 313 –
373 K, at higher CO2 partial pressure ranged between 0.1 kPa – 1000 kPa.
In comparison with the thermodynamics model of Xu et al. (1998), the
performance of Modified Kent-Eisenberg at higher pressure is considered better than Xu
et al. (1998) as its average error of 15.22% is lower than Xu et al (1998), which yield
17.91% average error.
Besides that, it is interesting to note that Modified Kent-Eisenberg model gives
higher percentage of error as the temperature increase from 328 K to 353 K. It is
recommended that the model is reassessed in order to improve the accuracy of the
prediction under higher temperature. Besides that, the regression for the parameters of gi
and ki shall include the effect of temperature into the analysis of factor Fi.