Minimize Solvent Oxidation with NOX Pre-scrubbing

The DOE and general public have an interest in finding lower cost ways to capture carbon dioxide (CO2) from the flue gas of electric power generation plants. Trimeric’s application addresses the specific technical problem of how to prevent nitrosamine accumulation in the solvent system and minimize solvent oxidation. The presence of nitrosamines increases the cost for capturing CO2 and is an environmental concern and potential occupational hazard for workers. This research is aimed at developing a novel and low-cost method for reducing the potential for nitrosamine accumulation. Statement of How this Problem or Situation is Being Addressed: Trimeric and the University of Texas are working to develop a chemical process for removal of NO2 from amine CO2 capture solvents in order to minimize solvent losses. The process involves the use of lowcost additives in an existing SO2 pre-scrubber. The Phase I research will include laboratory and small scale field tests to demonstrate the process under controlled conditions and an engineering feasibility study to determine how the process will be implemented at full scale and how economical it will be compared to conventional approaches. Phase II will include field tests to demonstrate the process at a larger scale at a power plant. Commercial Applications and Other Benefits: The primary commercial application for this technology will be for power plants that are equipped with carbon capture systems that use amine-based solvents. Key Words: Carbon dioxide, CO2 capture, SO2 pre-scrubber, polishing scrubber, nitrogen oxides, nitrosamines