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ABSTRACT
The influence of addition of 2-(1-piperazinyl)-ethylamine (as a promoter) on the solubility and absorption rate of carbon dioxide (CO2) in aqueous potassium carbonate solution (as a main solvent) was investigated experimentally, using a vapor liquid equilibrium (VLE) equipment in temperatures from 303.15 to 323.15 K and CO2 initial partial pressures between 25 and 75 kPa. The experimental data showed that the addition of 2-(1-piperazinyl)-ethylamine to potassium carbonate solution results in a significant enhancement in the solubility and absorption rate of CO2. The response surface methodology was applied to explore the relationship between independent parameters on the CO2 loading capacity of blended solution.
Nomenclature
| = | Initial pressure in the gas storage tank (kPa) | |
| = | Final pressure in the gas storage tank (kPa) | |
| = | Compressibility factor | |
| = | Compressibility factor | |
| = | Volume of the gas storage tank (m3) | |
| T: | = | Temperature (K) |
| = | Total pressure in reactor (kPa) | |
| = | Solution vapor pressure (kPa) | |
| = | Total blend concentration (mol/l) | |
| t: | = | Time (s) |
| = | Final pressure of reactor (kPa) | |
| = | Initial partial pressure of CO2 (kPa) | |
| = | Equilibrium partial pressure of CO2 (kPa) | |
| = | Total number of moles of CO2 introduced into the reactor | |
| = | Number of moles of CO2 remaining in reactor | |
| = | Volume of gas CO2 in the reactor (m3) | |
| = | Number of absorbed moles of CO2 | |
| = | Compressibility factor of CO2 | |
| = | CO2 loading capacity | |
| = | Number of moles of solvent | |
| Y: | = | CO2 loading capacity |
| = | Temperature (K) | |
| = | Mole ratio of PZEA in total blend concentration | |
| = | Initial Partial pressure of CO2 (kPa) |