C02 Solubility In Aqueous Solution Of 2-Amino-2ethyl-1,3-propanediol (AEPD) and Piperazine (Pz)

Most of the power plants are using conventional alkanolarnine such as
monoethanolamine (MEA), diethanolamine (DEA) and N-Methyldiethanolarnine
(MDEA) to adsorb C02 for CCS.2
-6 However, these conventional alkanolamine had
some disadvantages and not efficient. 9 With the emerging research of sterically
hindered amines (SHA)7 such as -amino-2ethyl-1,3-propanediol (AEPD) and the
usage of activator such as Piperazine (Pz/ being introduced to the industry, the
alkanolarnine used for CCS can be change and the process can be more efficient.
Main objective of this project is to measure the C02 solubility in aqueous solution
of AEPD and Pz Solution. The effects of initial pressure and concentration of
aqueous solution of AEPD and Pz towards C02 solubility are also studied. The
solubility experiment is conducted using High Pressure Gas Solubility Cell. For this
experiment, concentration of AEPD used are 1.0 mol, 2.0 mol and 3.0 mol. Each of
the different concentration of AEPD will be mixed with Pz with concentration of
0.1 mol, 0.2 mol and 0.3 mol. the mixture of the AEPD and Pz will be in volume
ratio of 3: I. All of the experiments are conducted in constant temperature which is
30°C. Different initial pressure of 5 bar2, I 0 bars, and I 5 bars are also used for each
sample. The solubility of C02 is determined in terms of C02 loading per mole of
amine used. Three of the highest C02 solubility achieved is 2.4714, 2.3989 and
2.1560 at amine mixture concentration of 1.1 mole, 1.2 mole and 1.3 mole
respectively at initial pressure of I 5 bars. Meanwhile, three of the lowest C02
solubility achieved is 0.3964, 0.4280 and 0.4421 at amine mixture concentration of
3.1 mole, 2.1 mole and 3.3 mole at initial pressure of 5 bars. In addition, as the
initial pressure for adsorption process is increased, the rate of C02 adsorption will
increase and the time taken for the adsorption process to reach equilibrium will be
faster. As the concentration of AEPD increases, the C02 loading will decrease.
However, the trend of C02 loading for different concentration of Pz could not be
determine as there is no significant changes and trend when the Pz concentration is
varied.