In order to decrease energy consumption and cost for CO2 capture with absorption

with monoethanol (MEA) solution as the example and electrolytic non-random two-liquid model（E-NRTL）

CO2 solubility is calculated. In the calculation

chemical reaction equilibria and gas-liquid phase equilibria are included

and calculation results are in good agreement with literature data. Then process simulation software for CO2 absorption is established

and total energy consumption is calculated including those for regeneration

gas compression and liquid transportation. Different effects to total energy consumption

such as absorption pressure

regeneration pressure

solution concentration and flow rate

are analyzed and optimized. All these methods can be used for further development of CO2 capture processes with the absorption method.