Presented at GasTech Centre of Technical Excellence 23 March 2011
Maria Barrio, SINTEF
Recent statistics from World Energy Outlook show that about 43% of the remaining natural gas resources contain CO2 and H2S. Acid gas removal is necessary in order to reach sales gas specifications.
The most extended technology at present is the use of physical and/or chemical absorption processes. The chemicals used for these processes are in many cases classified as red according to the Norwegian offshore classification of chemicals and need to be phased out. In addition, the energy requirements for regeneration are large. Membranes are also used in some cases, but their separation performance is not optimal and they are often not suited for offshore applications because of its large footprint.
Furthermore, the handling of CO2 and H2S needs to be integrated into the process, as the ultimate objective of this project is to avoid emissions to air. The requirements for transport of unwanted contaminants will pose additional requirements into the acid gas removal concepts.
The objective of the project "A GREEN SEA" is to identify, mature and evaluate new technologies and concepts for acid gas removal avoiding CO2 emissions to air and avoiding the use of harming chemicals. This research project started in June 2009 with four oil & gas companies as partners.
The presentation will provide more information about the project focusing on:
• Fundamental aspects: thermodynamics, equilibrium curves, impact of impurities
• Crucial parameters for new candidate technologies: selectivity, modelling of performance, regeneration energy, physical solubility, process simulations
• Potential for improvement in the existing commercial processes
• Research approaches and methodology
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