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With Pentair Advanced Amine Technology, CO2 can be captured from any gas stream based on the combustion of fossil fuels, including but not limited to coal, heavy fuel oil-fired steam boilers, and natural gas-fired combustion engines.
Moreover, the technology can be used to capture carbon dioxide from non-power generation sources, like lime kilns.
The capture plants from Pentair are based on high concentrated monoethanolamine (MEA). MEA is a primary amine that reacts readily with carbon dioxide. Since the reaction is purely chemical absorption, it works well with gas streams having low partial CO2 pressure, as is the case for flue gases.
Once the carbon dioxide is captured in the MEA solution, it is transferred to a stripping system. Here it is again released from the MEA solution by increasing the temperature of the solution to a point where the chemical reaction that took place in the absorber is reversed.
Having started as a gas with a low concentration of CO2 (depending on the type of fuel used, the CO2 will be in the range of 3% to 30%), the gas being released from the stripper is a highly concentrated stream containing roughly 99% pure carbon dioxide. This stream can either be used directly in gaseous form or be further purified and liquefied to meet the strictest requirements for food and beverage grade carbon dioxide following specifications from regulators like the International Society of Beverage Technologists (ISBT).
The purification column is the final purification step, consisting of a distillation column that enables separation/blow-off of non-condensable gasses, thereby reducing O2 content in the final product to the max. 5 ppm (v/v) and obtaining corresponding CO2 purity of higher than 99.99% (v/v).
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