Supercritical CO2 Capture

Carbon dioxide capture and storage (CCS), which involves the processes of capture, compression, pipeline transport and storage of carbon dioxide, is a technology aimed at reducing atmospheric emissions of acid gases, especially CO2, because of environmental regulations. Specifically, the CO2 capture from sour natural gas wells to reinject it into the underground zone of the reservoir have been considered one of the greatest promises for reducing CO2 emissions. The separation processes employed to remove this acid gas (natural gas sweetening) cover a wide range of operation conditions from atmospheric to supercritical states and involve multi–component mixtures, therefore, the knowledge of the phase behaviour of acid mixtures plays an important role in the design and operation of many processes involved in CCS. The phase equilibria data of supercritical CO2 alone cannot satisfy all the requirements for the CCS process operations. In order to overtake these limitations, reliable thermodynamic models are required for predicting the complex phase behaviour as well as thermophysical properties.