Post-Combustion CO2 capture from exhaust gas by amines and membranes

Abstract

There is a necessity to reduce GHG emission because climate change may have critical consequences in many places the world. The main gas which causes climate change is CO2 which is released into atmosphere by industries and vehicles. This research aims to compare two technologies for CO2 capture: absorption with amines and membrane, and to present hybrid processes using these. A review of the state of art for CO2 capture is used in this research. The capture by absorption with amines is the state of the art for post-combustion because it produces CO2 with higher purity and is cheaper. However, the energy and installation cost is high which does not encourage its applicability. Membrane for CO2 capture from natural gas is promissory because of this. Thus, researchers have studied other technologies for CO2 to replace or add through hybrid processes. Capture by membrane is a promising technology for this, provided that it presents appropriate selectivity and permeability. This paper presents a comparison between CO2 capture by absorption with amines and by membranes. The goal is to discuss hybrid processes with these two technologies in series.